DAILY SUNSPOT NUMBERS 1890

Year Day Jan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1890 01 12 12 3 io) 2 0 0 21 37 14 ie) 11
1890 02 12 9 0 0 ie) 0 0 18 33 4 0 iL
1890 03 7 to) 3 0 0 0 0 42 3 0 16
1890 604 12 it) 14 0 0 0 2 10 27 0 ie) te)
1890 05 12 Q 14 0 ie) 3 14 1S 26 0 ie) it)
1890 06 7 0 10 0 i) 5 17 7 31 6 0 0
1890 07 it) ie} 14 0 0 10 19 6 21 3 0 0
1890 08 ie) 0 15 0 0 13 28 2 18 3 14 2
1890 09 0 0 16 0 3 0 30 0 20 0 18 1
1890 10 0 0 18 9 15 5 30 2 18 0 11 1
189011 0 0 7 4 18 2 17 2 18 8 18 2
1890 12 1 0 15 7 18 0 14 to) 18 3 15 0
1890 13 ie) 0 12 6 7 io) 14 0 2 0 18 7
1890-14 0 3 4 2 0 0 5 0 Q 3 10 ray
1890 «15 0 i) 3 3 0 0 Q 2 5 2 2 22
1890 16 4 0 0 3 ie) 0 ie) 0 6 0 ie) 26
1890 17 7 0 0 0 10 Le) to) 0 9 9 0 10
1890 18 0 0 0 0 16 0 0 0 20 0 3 22
1890 «19 20 0 QO 0 24 0 0 0 18 0 ie) 19
1890 20 20 0 i} 0 8 ce} te) 0 6 20 0 al
1890 21 18 0 0 0 12 0 it) id) 3 24 it) 3
1890 22 4 0 0 0 6 0 5 ie) 2 26 18 3
1890 23 0 0 0 0 2 0 15 0 0 35 12 4
1890 24 ie) 0 0 0 2 2 15 0 12 27 21 0
1890 25 0 0 0 2 0 0 15 24 18 28 28 6
1890 26 0 io} 0 ie) 5 0 16 0 18 34 20 7
1890 27 ie) 0 0 0 0 9 16 24 24 26 22 5
1890 28 9 3 0 3 0 te) 16 27 20 27 19 5
1890 29 0 Q 4 0 0 26 29 19 25 20 6
1890 30 4 0 14 0 0 28 36 25 15 18 0

4 0 id) 18 2



DAILY SUNSPOT NUMBERS 1822

Year Day Jan Feb Mar Apr May Jun dul Aug Sep Oct Nov Dec
1822 01 ie) 0 0 15 40 0 32 i) 0 0 0
1822 02 ie) 0 ie) 15 0 20 0 v7 0 Q 0 0
1822 03 0 0 0 23 0 23 0 15 0 0 0 0
1822 «04 0 0 15 0 23 0 0 0 oO 0 0
1822 05 0 0 15 0 20 Q Q 0 0 0 0
1822 06 ie) 0 15 27 0 20 0 0 i) 0 0 Qo
1822 07 ie) id 15 39 0 17 0 0 0 Q 0 0
1822 08 to) ie) 31 0 0 0 0 0 0 0
1822 09 0 ie) 15 18 0 0 ie) 0 0 0 0 0
1822 10 0 io) 15 0 0 0 0 0 ie) 0 0
1822 11 0 0 39 17 ie) 0 Qo 0 ie) i) 0 ie)
1822 12 ie} 0 46 0 i) lo) i) 0 te) i) ie) 0
1622 13 0 ie) 35 0 te) 0 0 it) 0 0 0 ie)
1822 14 0 te) 31 0 0 0 0 0 it) 0 0 0
1822 15 0 25 31 0 0 0 QO 0 te} ie) 0 0
1822 16 i} 0 16 0 0 0 9 0 0 te) 0 0
1822 17 0 0 i) 0 ie) te} to) 0 0 i} 0 0
182218 co} 0 i) 0 te) 0 i) 0 0 0 ie) 0
1822 19 0 0 0 0 i} 0 0 ie) 0 0 0 0
1822 20 0 0 0 0 0 0 0 ie) 0 0 0 0
1822 21 ie) 0 0 0 0 0 0 9 ie} 0 0 0
1822 22 0 0 17 0 if) 15 0 0 Q 0 ie}
1822 23 0 0 35 23 0 0 21 0 0 ll 0 0
1822 024 ie) 0 a1 23 0 i) rah te) ie) 0 0 ie}
1822 25 0 0 19 0 ie) 33 0 0 0 0 ie}
1822 26 0 0 7 ral 0 0 33 0 0 0 0 0
1822 27 te) Qo 7 0 i) 35 0 0 iy 0 ie)
1822 28 0 0 25 19 0 0 0 0 9 0 ie)
1822 29 0 16 17 0 0 0 0 0 0
1822 30 0 15 16 20 0 38 0 0 0 0 0
182231 0 15 24 35 0 0 0
Mean 0.0 0.9 16.1 13.5 1.5 5.6 7.9 2.1 0.0 0.4 0.0 0.0
DAILY SUNSPOT NUMBERS 1823
Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1823. 01 0 0 i) 9 0 0 0 0 ie}
1823 02 0 0 0 ie) 0 0 0 9 0 il
1823, 03 0 0 0 0 0 0 0 21
1823 04 ie) 0 0 to) 0 id 0 it} 0 0 21
1823. 05 te) i 0 0 0 le) 0 0 0 21
1823 06 ia) 0 0 0 0 0 0 0 yal
1823 07 0 QO 0 i) 0 0 0 0 0 ie) 22
1823-08 0 0 0 0 ie) 0 0 0 te) 0 pai
1823, 09 0 0 0 0 0 0 ie) 0 9 i) ie) 21
1823. 10 0 le) 0 0 0 i} it) 0 ie) 22
1823. 11 0 ie) 0 0 0 0 i} 0 0 0 22
1823 12 0 0 ie) 0 0 0 ie) 0 0 0 22
1823. 13 0 0 7 0 0 0 0 te} 0 ie) 22
1823. 14 te} 0 Q 0 i) 0 0 ie)
1823.15 ie} 0 0 0 0 0 ie) 0 0 0
1823, 16 ie) 0 0 0 0 i) 0 0
1823. 17 ie) 0 i} 0 0 id) 0 0
1823. 18 0 0 0 ie) 0 ia) 0 0 0 11
1823. 19 0 ie} 0 i) 0 0 te) i) 0 0
1823 20 0 0 0 0 oO 0 0 0 0 0 0 26
1823 21 le) ie) 0 0 0 0 0 0 0 26
1823. 22 ie) it 0 0 0 0 0 0 0 0 al
1823, 23 ie) 9 0 0 0 0 ie} 0 0
1823 24 0 ie) 0 ie) it) 1 0 0
1823 25 0 0 0 it) ie) 0 0 0 Qo
1823 26 0 0 0 0 0 0 0 0 0 0
1823 27 lo} ie) 0 0 i} 0 0
1823, 28 0 ie) 0 0 0 0 0 0 0 ie) 0 15
1823 29 Le} ie) 0 0 0 0 0 0 0 0 21
182330 0 0 0 0 it) 0 0 0 0
1823.31 0 0 ie) 0 i) 0
Mean 0.0 0.0 0.6 0.0 0.0 0.0 0.5 0.0 0.0 0.0 0.0 20.4



WORLD DATA CENTER A
National Academy of Sciences
2101 Constitution Avenue, NW

Washington, DC 20418 USA

World Data Center A consists of the Coordination Office
and the following eight Subcenters:

COORDINATION OFFICE
World Data Center A
National Academy of Sciences
2101 Constitution Avenue, NW
Washington, DC 20418 USA
[Telephone: (202) 334-3368]

GLACIOLOGY (Snow and Ice)

World Data Center A: Glaciology
(Snow and Ice)

Cooperative Inst. for Research in
Environmental Sciences

University of Colorado

Boulder, Colorado 80309 USA

Telephone: (303) 492-5171

MARINE GEOLOGY AND GEOPHYSICS
(Gravity, Magnetics, Bathymetry,
Seismic Profiles, Marine Sediment,
and Rock Analyses):

World Data Center A for Marine
Geology and Geophysics

NOAA, E/GC3

325 Broadway

Boulder, Colorado 80303 USA

Telephone: (303) 497-6487

METEOROLOGY (and Nuclear Radiation)
World Data Center A: Meteorology
National Climatic Data Center

NOAA, E/CC

Federal Building

Asheville, North Carolina 28801 USA
Telephone: (704) 259-0682

OCEANOGRAPHY

World Data Center A: Oceanography
National Oceanographic Data Center
NOAA, E/0C

1825 Connecticut Avenue, NW
Universal Building, Room 406
Washington, DC 20235 USA
Telephone: (202) 673-5594

ROCKETS AND SATELLITES

World Data Center A: Rockets and
Satellites

NASA/Goddard Space Flight Center

Code 630.2

Greenbelt, Maryland 20771 USA

Telephone: (301) 286-7354

ROTATION OF THE EARTH
World Data Center A: Rotation
of the Earth
U.S. Naval Observatory
Washington, DC 20392-5100 USA
Telephone: (202) 653-1529 or 1527

SOLAR-TERRESTRIAL PHYSICS (Solar and
Interplanetary Phenomena, Ionospheric
Phenomena, Flare-Associated Events,
Geomagnetic Variations, Aurora,
Cosmic Rays, Airglow):

World Data Center A

for Solar-Terrestrial Physics
NOAA, E/GC2
325 Broadway
Boulder, Colorado 80303 USA
Telephone: (303) 497-6323

SOLID-EARTH GEOPHYSICS (Seismology,
Tsunamis, Gravimetry, Earth Tides,
Recent Movements of the Earth's
Crust, Magnetic Measurements,
Paleomagnetism and Archeomagnetism,
Volcanology, Geothermics):

World Data Center A

for Solid-Earth Geophysics
NOAA, E/GC1
325 Broadway
Boulder, Colorado 80303 USA
Telephone: (303) 497-6521

World Data Centers conduct international exchange of geophysical observations in accordance with the
principles set forth by the International Council of Scientific Unions. WDC-A is established in the
United States under the auspices of the National Academy of Sciences. Communications regarding data
interchange matters in general and World Data Center A as a whole should be addressed to World Data

Center A, Coordination Office (see address above).

Inquiries and communications concerning data in

specific disciplines should be addressed to the appropriate subcenter listed above

Library of Congress Catalog Number for UAG Reports:
International Standard Serial Number for UAG Reports:

75-643290
0579-7144

Cover: Photograph in 1905 of the Swiss Federal Observatory at Schmelzbergstrasse 25 in Zurich.
Courtesy Institut fur Astronomie, EIDGENOSSISCHE TECHNISCHE HOCHSCHULE-Zentrum, Zurich.



DAILY SUNSPOT NUMBERS 1908

1908 01 22 29 7 17 82 96 30 61 134 94 12 28
1908 = 02 45 25 7 20 68 106 43 85 160 71 23 31
1908 03 48 25 14 57 65 116 45 107 135 62 13 30
1908 904 $7 44 a1 100 53 95 57 107 122 67 ral 34
1908 05 76 26 25 109 55 95 61 136 103 67 29 27
1908 06 65 28 22 109 49 85 44 114 81 41 45 31
1908 07 67 33 32 109 65 75 37 133 77 a7 63 17
1908 08 60 40 31 105 82 62 15 127 75 48 49 30
1908 09 43 47 22 97 53 35 30 133 100 52 81 38
1908 10 45 46 37 86 77 46 8 106 100 55 92 46
1908 il 52 47 43 65 59 29 16 60 79 51 71 27
1908 12 51 61 43 47 54 23 8 32 68 31 79 29
1908 = 13 58 61 42 32 38 24 12 56 55 23 83 27
1908 14 44 $2 40 18 23 25 16 80 66 8 70 20
1908 15 40 31 38 19 31 28 49 89 78 7 87 20
1908 = 16 36 29 52 12 16 23 49 80 48 7 78 21
1908 17 43 40 38 19 24 22 65 97 70 0 63 38
1908 18 41 29 46 21 25 38 67 87 86 ie} 33 43
1908 19 15 10 49 22 19 60 68 80 89 0 45 36
1908 20 23 30 53 61 26 35 70 65 74 11 34 32
1908 21 7 30 55 4g 14 31 73 82 80 14 37 29
1908 922 39 22 41 50 25 23 93 75 83 34 44 61
1908 23 48 29 28 55 16 21 68 67 75 28 26 64
1908 24 39 26 7 43 7 37 51 56 87 22 31 84
1908 = 25 30 19 15 55 7 35 43 49 99 7 38 71
1908 26 32 44 ie) 40 14 39 13 59 85 19 31 53
1908 27 20 43 8 50 ray 37 14 105 75 24 23 46
1908 28 7 22 22 89 43 31 7 103 66 31 22 54
1908 = 29 7 16 17 85 38 34 14 94 76 28 7 46
1908 30 4 12 87 40 37 23 149 82 21 26 58
1908 31 31 12 76 34 133 22 55
Mean 39.2 33.9 28.7 57.6 40.8 48.1 39.5 90.5 86.9 32.3 45.5 39.5

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1909 01 59 80 89 56 45 7 13 30 28 26 61 121
1909 02 61 70 97 63 41 7 9 29 18 43 58 108
1909 03 36 $6 137 41 32 it) 7 31 14 57 66 85
1909 04 38 31 108 29 19 17 7 26 15 56 70 82
1909 05 37 21 60 44 25 24 7 30 25 67 92 47
1909 06 18 14 88 32 7 37 22 25 37 76 93 52
1909 07 52 13 29 29 25 29 27 22 41 75 73 31
1909 08 58 7 23 22 40 31 14 13 58 55 62 20
1909 09 48 7 29 16 40 31 12 18 59 112 40 7
1909 10 52 8 25 8 61 15 16 21 66 114 22 13
190911 32 35 7 9 52 7 0 25 71 81 26 0
1909 12 28 77 31 8 56 14 i) 36 72 109 27 0
1909 13 23 46 26 il 65 18 20 29 52 116 18 iL
1909 14 25 44 19 7 59 23 20 37 22 100 32 14
1909 15 28 53 16 7 62 26 22 44 22 86 36 18
1909 16 35 59 22 22 52 45 26 38 20 83 35 23
1909 17 31 52 18 29 38 41 34 29 21 58 31 39
1909 18 37 42 31 26 41 50 43 17 28 44 41 60
1909 19 40 28 43 46 29 28 76 24 38 42 44 71
1909 20 37 32 43 39 27 16 65 14 37 37 47 77
1909 21 40 29 61 70 39 26 69 14 41 26 52 75
1909 22 64 30 87 71 47 22 103 15 42 20 47 76
1909 23 66 51 109 $3 40 28 104 19 55 30 a7 56
1909 24 75 62 103 56 34 19 77 20 61 31 47 59
1909 25 100 66 126 35 22 17 92 20 46 49 67 71
1909 26 75 107 109 28 24 21 75 24 29 44 70 63
1909 27 101 96 76 22 21 22 47 8 19 22 79 82
1909 28 128 89 98 20 23 31 30 0 42 25 84 89
1909 29 135 113 28 22 14 30 19 44 22 109 76
1909 30 95 131 41 10 13 7 16 4l 41 97 78
190931 105 100 7 25 24 63 65
Mean 56.7 46.6 66.3 32.3 36.0 22.6 35.8 23.1 38.8 58.4 55.8 54.2



DAILY SUNSPOT NUMBERS 1930

1930 01 36 47 23 56 52 31 22 7 56 26 57 45
1930 02 4l 73 24 59 52 28 36 23 46 30 41 35
1930 03 55 98 28 41 50 28 35 7 48 26 25 33
1930 04 38 11L 54 42 41 34 28 7 68 30 26 20
1930 05 49 117 55 58 30 27 26 7 66 44 16 8
1930 06 55 110 50 57 37 34 28 7 73 43 8 7
1930 07 62 111 50 65 24 70 18 7 70 39 8 7
1930 08 68 82 49 35 26 65 18 16 41 37 8 lo}
1930 09 62 101 53 46 23 62 39 20 40 35 8 8
1930 10 56 66 28 50 19 52 al 20 4. 59 15 19
1930 il 65 79 7 56 22 52 15 yal 39 $3 8 21
1930 12 70 55 30 50 25 42 26 pal 33 48 15 7
1930 13 91 47 26 60 25 37 16 23 39 56 0 15
1930-14 89 37 7 45 18 23 24 13 23 38 12 22
19300 «15 96 36 28 33 32 pay 25 10 28 32 14 22
1930 16 108 22 44 22 41 20 24 9 17 24 ral 20
1930 17 107 21 52 20 35 16 29 10 8 iL 26 30
1930 18 135 23 44 14 25 15 9 23 0 22 31 52
1930 19 95 v7 42 10 31 9 8 23 7 22 43 50
1930 20 63 8 33 26 39 14 9 29 7 ll 57 42
1930 21 74 10 31 30 31 8 25 31 8 8 63 33
1930 22 59 13 33 31 33 8 14 28 10 11 66 27
1930 23 63 7 8 28 45 7 22 38 2 18 68 29
1930 24 49 20 24 23 67 10 14 37 18 16 48 42
1930 25 39 16 17 24 46 16 15 4. 20 29 58 $2
1930 26 34 15 25 25 43 14 16 35 35 37 76 54
1930 27 31 19 36 22 56 32 18 37 33 63 72 33
1930 28 46 26 31 39 38 28 34 43 31 53 67 19
1930 29 60 30 34 52 29 33 53 27 49 61 8
1930 30 67 52 46 48 31 10 50 20 49 $1 15
1930 31 62 52 35 22 47 47 15
Mean 65.3 49.9 35.0 38.2 36.8 28.8 21.9 24.9 32.1 34.4 35.6 25.8

193101 0 Q 34 34 17 13 22 23 34 10 8 19
1931 02 7 8 31 32 8 28 23 35 27 21 14 15
1931 03 0 28 25 29 7 34 23 34 26 14 v7 7
1931 04 9 27 33 37 8 36 19 28 18 18 18 0
1931 05 18 23 37 25 8 30 19 28 15 15 24 0
1931 06 u 29 33 31 v7 36 16 19 14 15 27 6
1931 07 il 18 29 41 Vv 32 38 8 15 7 13 12
1931 08 12 27 37 45 26 44 35 0 18 8 12 13
1931 09 14 29 33 46 20 35 28 2 13 7 16 24
1931 10 11 28 33 29 33 47 48 0 24 0 ie} 29
1931 11 10 20 38 37 33 20 35 8 29 7 0 35
1931 = 12 9 20 38 36 26 14 26 QO 23 0 io} 37
1931 0-13 16 23 43 44 32 0 30 8 27 8 o} 38
193114 41 19 47 38 17 10 23 0 26 9 0 35
1931 16 43 41 46 37 36 to) 8 0 19 8 0 25
1931 16 27 44 41 31 37 Q 7 0 27 ty) 0 22
1931 (17 20 47 $1 41 29 0 8 i 28 0 8 15
1931 18 22 45 49 22 32 7 7 14 26 0 14 8
1931 19 19 50 38 20 34 0 0 14 i 8 10 8
1931 20 24 64 40 20 22 0 0 10 13 8 16 8
1931 21 24 89 27 38 30 0 7 10 10 10 37 8
1931 22 22 79 25 41 26 7 10 0 22 9 41 15
1931 23 21 100 v7 27 35 0 8 0 22 25 33 16
1931 24 16 92 16 29 32 0 8 0 16 18 40 22
1931 25 20 68 8 37 31 0 8 0 7 12 44 31
1931 26 7 76 8 21 35 0 0 8 7 11 42 30
1931 27 8 67 8 19 35 8 7 26 15 1 35 30
1931 28 5 47 14 14 20 10 9 36 17 lt 31 15
1931 29 7 16 v7 19 25 22 25 10 9 35 9
1931 30 le) 9 18 20 23 23 26 ae 12 27 1
1931 31 0 27 20 23 30 18 9
Mean 14.6 43.1 30.0 31.2 24.6 15.3 17.4 13.0 19.0 10.0 18.7 17.8



2807
240-44

2004

1604

120 4

804

40-4

ETT TTT TTT TTT LAAAAARARS RAMADAN RAE RRR REE ROR RE O LUNAR OO

1700 1710 «©1720 1730 1740 1750 1760 1770 1780 1790 1800
280

240-

200-4

160]

yh
1800
280

TTT TTT TTT TT TT aos RRR pores

r
1810 1820 1830 1840 1850 1860 1870 1880 1890 1900

804

o- Preererprerrererry rrrperrerrrrr perry rr iret prrrrrrrrryperrrrrrrryprrererrerprrrr

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000
MONTHLY MEAN SUNSPOT NUMBERS January 1749 - December 1985. Monthly mean numbers reveal the sunspot
counts variability. Monthly averages also contain a 27-day fluctuation that reflects the rotation
period of the sun and the uneven distribution of spot groups across solar longitudes. The largest
monthly mean (253.8) occurred in October 1957

Graph: Daniel C. Wilkinson
13



DAILY SUNSPOT NUMBERS 1920

Year Day dan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1920 01 4g 23 18 13 23 54 38 29 45 50 35 22
1920 02 41 19 ll 9 22 53 38 26 33 41 34 7
1920 03 40 34 27 il 14 56 40 26 38 43 41 v7
1920 04 53 22 37 8 37 40 46 15 43 58 53 14
1920 05 32 26 53 12 44 37 4. 8 51 43 57 7
1920 06 16 22 36 20 46 28 4. 9 43 29 53 14
1920 07 16 30 34 ai 37 7 37 7 37 41 46 13
1920 08 17 31 54 16 49 31 35 0 36 52 47 14
1920 09 15 33 89 Q 35 40 25 7 19 42 28 16
1920 10 41 28 115 7 46 40 27 10 20 64 19 11
1920011 49 $5 104 11 44 48 20 10 24 66 13 16
1920 12 43 41 102 ai 34 35 20 15 31 72 12 17
1920 13 34 84 67 18 42 39 7 32 34 67 9 16
1920 14 31 88 31 25 35 30 17 36 40 74 14 20
1920 15 40 96 33 28 31 33 7 53 41 77 15 al
1920 16 37 80 42 26 17 31 8 46 32 53 16 15
1920 17 29 77 92 20 7 34 22 38 0 42 11 14
1920 18 42 79 77 17 9 14 29 23 0 33 7 31
1920 19 40 79 133 ai 18 24 25 19 0 40 8 41
1920 20 29 92 134 8 7 29 19 19 0 38 9 60
1920 21 34 81 169 7 7 41 14 19 7 40 7 51
1920 22 69 90 150 7 26 26 23 22 16 49 16 40
1920 23 78 93 161 13 24 49 32 17 35 60 17 45
1920 24 112 $3 114 0 20 43 30 12 35 65 24 45
1920 25 130 68 7 7 23 56 37 9 62 64 47 53
1920 26 112 48 79 1 41 42 35 9 85 57 42 72
1920 27 98 38 48 7 49 46 34 9 85 45 35 49
1920 28 113 27 23 17 59 53 37 8 80 43 33 56
1920 29 59 26 31 28 59 $3 26 7 56 35 36 34
1920 30 54 14 25 61 50 16 22 61 25 32 27
1920 31 32 20 65 15 22 30 50
Mean 51.1 53.9 70.2 14.8 33.3 38.7 27.6 19.2 36.3 49.6 27.2 29.9

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1921 (OL 38 pa 16 28 0 25 109 22 19 0 7 0
1921 02 23 22 1 25 16 26 85 20 10 0 12 0
1921 03 26 27 10 32 10 24 95 7 16 0 0 0
1921 04 44 22 7 35 Q 22 89 9 8 0 0 0
1921 05 26 26 ie) 22 0 20 97 8 Q 0 0 0
1921 06 25 18 0 22 0 23 80 0) 0 0 0) 0
1921 07 7 24 i} 34 0 32 59 0 8 0 0 0
1921 08 18 40 7 25 9 68 46 te) 0 16 0 0
1921 09 19 36 ll WV 23 58 58 0 i} 8 0 12
1921 10 29 35 22 26 40 60 50 0 11 7 0 9
1921 ll 37 36 40 28 57 55 4? 10 13 7 0 28
1921 12 55 34 44 47 50 43 56 20 17 19 10 25
192113 61 33 35 38 71 41 44 14 26 19 il 36
1921 «(14 78 25 53 28 63 25 29 14 23 25 15 43
1921.15 76 22 35 38 49 16 15 13 35 16 15 42
1921 «16 55 20 29 49 37 0 7 15 29 14 14 46
1921 «17 47 25 31 55 32 8 14 16 26 8 14 57
i921 18 21 28 34 41 46 9 13 29 33 7 24 61
192119 34 37 24 60 38 12 18 27 35 10 38 56
1921 20 41 48 7 50 18 8 16 29 37 v7 51 48
192121 35 31 28 41 22 13 13 33 29 11 43 46
192122 26 38 23 47 8 14 7 44 23 19 55 33
192123 30 44 36 37 di 20 7 22 19 40 49 21
1921 24 20 36 39 28 8 17 14 32 23 64 44 12
1921) 25 15 13 35 33 13 30 24 39 20 60 30 12
1921 26 20 14 40 32 7 41 29 48 17 59 25 8
1921 27 15 20 55 24 fal 68 24 82 16 53 23 19
1921 28 7 16 53 22 7 75 35 59 7 39 rat 8
1921 29 7 42 7 7 74 35 34 7 21 15 8
1921 30 13 33 ie) 15 85 40 24 8 14 1 0
1921 31 10 27 0 33 27 10 0
Mean 31.5 28.3 26.7 32.4 22.2 33.7 41.9 22.8 17.8 18.2 17.8 20.3



DAILY SUNSPOT NUMBERS 1836

1836 06 76 106 152 111 110 146 110 125 65 66

1836 07 82 185 101 135 81 96

1836 08 110 147 131 114 82

1836 09 95 169 95 171 105 85 157

1836 10 67 120 137 102 184 106

1836011 96 137 104 119
1836012 167 116 99 150
1836013 95 90 94 29

1836 «14 87 184 92 30

18360 «15 106 91 160 105 202 204
1836 «16 80 115 69 120 121 175 116

1836 «17 109 87 207 111 85 140

1836 18 59 72 114 86 151 221
1836 19 124 106 144 90 230 156

1836 20 67 67 177 120 12 86

1836 21 59 47 75 139 110 157 79 215 195
1836 22 45 96 186 145 77 97 221

1836 23 110 94 124 122 92

1836 24 89 140 98 91 142 90

1836 25 96 124 136 85 124 104

1836 26 131 142 40 139 122 142

1837 03 131 116

1837 04 207 99 114

1837 05 237 209 170 159 69 146

1837 06 165 162 81 236 91 100 106

1837 07 119 120 151 74

1837 08 237 107 92 164 81 102 v7
1837 09 192 141 75 124 149

1837 10 159 214 171 179 125 90

1837) il 209 127 100 85

1837 12 159 175 111 177 155 126 76

1837) 13 126 77 179 81 96

1837. 14 124 77 156 94 142

1837. 15 159 154 159 69 107
1837. 16 140 7 135 154 77 111
1837. 17 136 85 144 122 62
1837.18 144 136 115 66
1837. 19 . 141 184

1837-20 157 139 106 136 97 161

1837) 21 169 261 161 “129 124 116 157

183722 207 240 172 140 161 102 76
183723 130 176 115 9

183724 127 115 82 121 75

1837) 25 146 107 75 45
1837-26 142 104 175 105 61 156

183727 109 152

1837-28 167 179 232 101 151

183729 130 236 171
1837 30 142 182 175 152 109
183731 189 lil 137 147 170 212
Mean 188.0 175.6 134.6 138.2 111.7 158.0 162.8 134.0 96.3 123.7 107.0 129.8



DAILY SUNSPOT NUMBERS 1978

1978 (O01 90 128 102 70 85 119 64 42 136 96 109 110
1978 902 94 120 92 68 89 98 61 48 167 112 122 110
1978 03 104 130 95 71 93 78 Sl 38 159 105 125 117
1978 04 103 142 98 75 92 60 48 62 162 100 129 115
1978 05 91 137 84 94 89 51 54 74 177 73 121 104
1978 06 79 129 75 92 85 31 63 66 177 74 108 122
1978 07 55 122 90 88 75 39 84 58 147 95 112 138
1978 08 39 90 99 105 63 45 105 62 120 103 118 148



DAILY SUNSPOT NUMBEI

1850 «(01 133 109 93 40 25 100 34

37 81 $2 53 64
1850 02 85 94 106 34 107 60 14 57 126 69 48 $7
1850 03 114 113 97 46 45 42 36 77 105 88 $5 30
1850 (04 52 86 67 0 36 70 36 71 107 51 53 60
1850 05 57 86 94 24 75 80 18 52 86 49 30 40



DAILY SUNSPOT NUMBERS 1900

1 0

4 0

0 0

0 0

0 0

0 0

0 0

1 0 0

0 io} 0

ie) 0 0

0 0 io}

0 0 0

0 7 7 0

9 0 8 0

7 10 9 18 0 8 0 7 0

0 0 15 22 le) 7 10 7 0

0 0 17 16 0 0 15 12 Q

0 to) 24 22 0 0 24 11 0

7 2 25 30 0 0 28 ig 0

7 1 29 20 0 0 31 10 le}

7 10 39 16 0 0 35 14 0

7 14 29 25 0 0 36 10 0

15 15 20 14 0 0 31 7 0
17 15 19 16 0 7 19 8 0
35 14 7 7 te) 0 24 0 0
31 13 8 7 0 0 9 0 7
0 0 7 0 2

0 1 0 0 0

0 0 0 0 te}

0 8 0 tt) 0

0 0 0

0 0 0 0 0 0 0 8 0
0 0 15 0 10 0 i) ie) Q
0 0 7 le) 7 0 to) 0 0
0 0 0 0 0 0 ie) 0 0
0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0
le) 0 0 0 ce} lo} 7 0 0
0 ti) 0 0 ie} 0 7 0 0
0 0 0 0 te} 0 9 0 0
0 to) 0 0 ie} 0 14 0 0
ie} i) ie} 0 0 8 10 0 le)
0 te) 0 0 le) 9 20 0 ie)
0 0 0 0 0 0 le) 8 0
0 0 7 0 0 0 0 7 0
0 ie) 10 0 0 0 0 7 0
0 0 8 0 ie} 0 0 dt 0
0 ie) 9 0 ie} 0 0 7 0
0 0 8 0 0 0 0 8 0
0 9 16 io) it) 0 0 10 0
0 20 9 io) 0 0 0 7 0
0 25 8 ie) 0 0 0 7 0
0 39 8 7 0 0 0 7 0
0 36 16 7 7 0 0 11 0
ta) 39 22 7 0 0 0 9 0
0 26 17 0 7 0 0 8 0
0 28 14 0 0 0 0 0 iv)
0 29 it) 0 0 0 0 0 0
0 20 0 0 0 0 11 0 0
0 19 0 0 0 0 10 0 0
to) 16 0 Q 0 0 16 0 0

10 0 0 12 0



DAILY SUNSPOT NUMBERS 1842

Year Day dan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1842 (O01 0 0 20 14 42 14 30 29 0
1842 02 i) it) 20 16 29 34 29 37 32 0
1842 03 0 35 i) 16 19 25 30 30 37 20 15
1842 (04 54 0 0 20 31 21 31 61 7

1842 (05 i) 75 Qo 14 19 27 32 27 36 33

1842 (06 29 44 15 $1 16 16 29 29 51

1842 07 0 40 46 21 51 14 14 31 45 37

1842 08 0 45 50 18 66 14 i) 19 16 $1 39

1842 09 0 42 30 72 14 0 16 14 26 32

1842 «10 50 40 $2 32 oO 16 15 56

1842 «11 46 36 64 70 20 ie) 36 24 61 47
1842 12 14 42 44 56 32 22 i) 35 22 15 51 31
1842 13 26 $5 15 19 Ly) 42 22 27 59

1842 14 20 38 36 16 19 0 41 20 56

1842 15 42 41 29 50 17 22 0 40 19 50 63 16
1842 16 34 16 51 36 27 0 40 8 61 V7
1842 «17 35 16 37 15 35 0 44 0 79

1842 «(18 65 19 27 32 32 Q 39 0 58 74 15
1842 19 62 16 15 15 31 0 39 0 57 42 14
1842 20 16 16 39 QO 29 0 33 16 45

1842 21 20 36 39 0 14 0 31 45 15

1842 22 50 19 0 34 0 27 ie) 14 39 42 16

1842 23 22 tt) 0 37 0 0 0 0 27 34 14
1842 24 24 O 0 al 0 0 0 0 19 29 21 16
1842 25 19 0 14 20 19 16 14 0 15 35 32 14
1842 26 21 it) 0 25 20 24 34 20 0 32 14
1842 27 0 0 15 16 20 21 $5 20 0 34 37 14
1842 28 0 0 14 14 47 25 al 25 0 31

1842 929 0 0 27 27 a7 26 21 V7 36 14 37
1842 30 0 21 14 27 37 37 30

1842 (31 0 0 15 20 27 14

Mean 20.4 22.1 21.7 26.9 24.9 20.5 12.6 26.6 18.4 38.1 40.5 17.6

DAILY SUNSPOT NUMBERS 1843

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1843 01 0 0 ie) 34 29 19 14 15 it) 14 34
184302 0 0 31 0 42 25 id) 14 0 0 16 36
1843, 03 15 o 30 0 44 ig tt) 14 0 14 15 49
1843 04 0 9 30 0 46 14 21 14 0 14 29

1843 05 (0) 16 27 0 24 14 24 14 0 14

1843 (06 31 19 24 0 id 0 0 16 39
1843 07 15 0 0 te) 0 14 25 15

1843 08 0 14 0 16 0 0 0 14 16 14 30
1843 09 25 16 0 14 0 16 0 0 19 14 15
1843 10 0 0 id) 14 0 0 32 15 0
1843) il 27 15 i) o 0 0 0 0 i) 15 15 0
1843 12 22 il 0 15 0 it) i) ie) ie) 0 15 0
184313 36 7 0 15 0 15 20 it} 0 0 20 ie}
1843.14 36 0 0 0 0 15 20 0 0 0 v7 0
1843) 15 ie) 0 ie) 24 0 30 0 0 ie) 0 0
1843-16 30 ie) 0 15 20 0 14 0 9 ie) 14 0
1843 «17 it) 0 15 rah 0 ie) 0 0 0 22 0
1843 18 24 0 15 id) 0 0 0 0 iu ral oO
1843 16 16 0 15 i) 14 0 0 0 ie) 45 ie)
1843 20 0 14 0 16 ie) 4 0 0 24

1843 21 pe) Q 7 0 26 0 19 20 0 16

1843 22 22 ie) id) 26 ie) 41 15 0 32

1843, 23 24 0 0 0 14 19 to) 27 it} 0 40

1843 24 0 0 31 19 0 21 16 0 27
1843-25 0 14 36 16 16 7 16 0 19

1843 26 Q 7 42 16 17 31 15 0 27

1843 27 ie) 0 0 19 42 16 20 25 0 0 14

1843 28 is) 15 29 51 to) 22 19 0 0 0
184329 0 15 30 30 0 14 27 0 Q 15

1843 30 0 17 27 40 wi] 14 27 0 0

1843 31 0 0 37 15 27 0

Mean 13.3 3.5 8.3 9.5 21.1 10.5 9.5 11.8 4.2 5.3 19.1 12.7



DAILY SUNSPOT NUMBERS 1906

1906 01 47 66 23 119 43 68 124 53 85 29 21 89
1906 02 38 37 47 115 52 71 121 45 62 28 14 67
1906 03 34 36 22 73 37 89 132



1980
1980
1980
1980
1980
1980
1980
1980
1980

159.6

155.0

DAILY SUNSPOT NUMBERS 1980



DAILY SUNSPOT NUMBERS 1862

Year Day dan Feb Mar Apr dun dul Aug Sep Oct Nov Dec
1862 - 01 52 77 96 34 89 78 115 70 65 71 14
1862 02 27 100 73 40 106 91 97 55 40 36 QO
1862 03 57 96 74 73 106 76 91 75 40 26 0



Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec

157.9 188.8



YEARLY MEAN SUNSPOT NUMBERS

Sunspot Sunspot Sunspot Sunspot Sunspot.
Year Number Year Number Year Number Year Number Year Number

2 4 3 1921 26.1 1976 12.6 m
1702 «16 1757 32.4 1812 5.0 1867 7.3m 1922 14.2 1977 27.5
1703 23 1758 47.6 1813, 12.2 1868 37.6 1923 5.8 m 1978 92.5
1704 36 1759 54.0 1814 13.9 1869 74.0 1924 16.7 1979 155.4 M
1705 58 OM 1760 62.9 1815 35.4 1870 139.0 M 1925 44.3 1980 154.6
1706 29 1761 85.9 M 1816 45.8 M 1871 111.2 1926 63.9 1981 140.4
1707-20 1762 61.2 1817) 41.1 1872 101.6 1927 69.0 1982 115.9
1708 «10 1763) 45.1 1818 30.1 1873, 66.2 1928 77.8 M 1983 66.6
1709 8 1764 36.4 1819 23.9 1874 44.7 1929 64.9 1984 45.9
1710 3 1765 20.9 1820 15.6 1875 17.0 1930 35.7 1985 17.9
17il QO 1766 «11.4 m 1821 6.6 1876 = 11.3 1931 21.2
1712 Oo om 1767 37.8 1822 4.0 1877, 12.4 1932 11.1
1713 2 1768 69.8 1823 1.8 m 1878 3.4m 1933 5.7 m
1714 «11 1769 106.1 M 1824 8.5 1879 6.0 1934 8.7
1715 27 1770 100.8 1825 16.6 1880 32.3 1935 36.1
171647 1771 81.6 1826 36.3 1881 54,3 1936 79.7
1717 63M 1772 (66.5 1827 49.6 1882 59.7 1937 114.4 M
1718 «60 1773, 34.8 1828 64.2 1883 63.7 M 1938 109.6
171939 1774 30.6 1829 67.0 1884 63.5 1939 88.8
1720 28 1775 7.0 m 1830 70.9M 1885 52.2 1940 67.8
1721 26 1776 = 19.8 1831 47.8 1886 25.4 1941 47.5
1722 22 1777) 92.5 1832 27.5 1887 13.1 1942 30.6
1723, 11lsom 1778 154.4 M 1833 8.5 m 1888 6.8 1943 16.3
1724 21 1779 125.9 1834 13.2 1889 6.3m 1944 9.6m
1725 40 1780 84.8 1835 56.9 1890 7.1 1945 33.2
1726 78 1781 (68.1 1836 121.5 1891 35.6 1946 92.6
1727 122 2M 1782 38.5 1837 138.3 M 1892 73.0 1947 151.6 M
1728 103 1783 22.8 1838 103.2 1893 85.1 M 1948 136.3
172973 1784 10.2 m 1839 85.7 1894 78.0 1949 134.7
173047 1785) 24.1 1840 64.6 1895 64.0 1950 83.9
1731.35 1786 82.9 1841 36.7 1896 41.8 1951 69.4
1732 11 1787 132.0 M 1842 24.2 1897 26.2 1952 31.5
1733 5 om 1788 130.9 1843, 10.7 m 1898 26.7 1953 13.9
1734 (16 1789 118.1 1844 15.0 1899 12.1 1954 4.4m
173534 1790 89.9 1845 40.1 1900 9.5 1955 38.0
1736 = 70 1791 66.6 1846 61.5 1901 2.7 m 1956 141.7
173781 1792 60.0 1847 98.5 1902 5.0 1957 190.2 M
1738 111 = 1793 46.9 1848 124.7 M 1903 24.4 1958 184.8
1739 101 1794 41.0 1849 96.3 1904 42.0 1959 159.0
1740, 73 1795) 21.3 1850 66.6 1905 63.5 M 1960 112.3
1741 40 1796 16.0 1851 64.5 1906 53.8 1961 53.9
1742 20 1797 6.4 1852 54.2 1907 62.0 1962 37.6
1743 «16 1798 4.1m 1853 39.0 1908 48.5 1963 27.9
1744 5 om 1799 6.8 1854 20.6 1909 43.9 1964 10.2 m
17450 ll 1800 «(14.5 1855 6.7 1910 18.6 1965 15.1
1746 22 1801 34.0 1856 4.3m 1911 5.7 1966 47.0
1747 40 1802 45.0 1857 22.7 1912 3.6 1967 93.8
1748 «60 1803 43.1 1858 954.8 1913 1.4m 1968 105.9 M
1749 80.9 1804 47.5 N 1859 93.8 1914 9.6 1969 105.5
1750 83.4 M 1805 42.2 1860 95.8 M 1915 47.4 1970 104.5
1751 47.7 1806 28.1 1861 77.2 1916 57.1 1971 66.6
1752 47.8 1807) 10.1 1862 59.1 1917 103.9 M 1972 68.9
1753 30.7 1808 8.1 1863 44.0 1918 80.6 1973 38.0
1754 12.2 1809 2.5 1864 47.0 1919 63.6 1974 34.5
1755 9.6 m 1810 0.0 m 1865 30.5 1920 37.6 1975 15.5

Each M marks a sunspot cycle maximum and each ma minimum. Through 1944 yearly means were calculated as
the average of the 12 monthly means; since 1945 yearly means have been calculated as the average of the
daily means.



CONTENTS

Page
Introduction... 6. we ee ee eo
(1610-1985) Minima and Maxima of Sunspot Number Cycles ......,. 5
(1700-1985) Yearly Mean Sunspot Numbers (Table). .... see ee 6
(1700-1985) Yearly Mean Sunspot Numbers (Graph). ......... 7
(1749-1985) Monthly Mean Sunspot Numbers (Tables). ........ . 9
(1749-1985) Monthly Mean Sunspot Numbers (Graph) ....... wee 13
(1749-1985) Smoothed Monthly Mean Sunspot Numbers (Tables) ..... 15
(1749-1985) Smoothed Monthly Mean Sunspot Numbers (Graph). ..... 19
(1818-1985) Daily Sunspot Numbers (Tables). ........ eee 21
(1818-1985) Daily Sunspot Numbers (Graph). ............ . 105

UAG Series of Reports, 2... we ee ee eee ee ee ew we 107

iii



DAILY SUNSPOT NUMBERS 1856

Year Day dan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1856 (01 0 0 0 0 if) 0 0 lt i) 0 18 il
1856 902 0 0 0 0 0 12 0 0 19 0 22 0
1856 03 0 oO 0 0 id 13 12 0 19 ie) iL 0
1856 04 0 oO 0 it) ie] 29 il ie) 7 ie) 0 0
1856 «(05 0 oO 0 0 0 26 id) 0 14 ie) 0 io)
1856 «06 0 0 0 i) 0 23 ie) 0 15 ie) 0 0
1856 07 0 4 0 i} 0 0 0 0 lL ie) 0 0
1856 08 0 14 Q it) 0 0 Q 0 0 ie) 0 0
1856 09 0 16 0 12 0 15 0 0 oO i) 0 0
1856 10 0 15 Q 12 0 22 0 0 0 Q 0 0
185611 0 12 QO 13 0 0 0 0 0 13 ie} 0
1856 12 0 tt) 0 12 0 it) 0 0 0 14 0 0
1856 13 0 i) 0 18 0 15 0 0 14 27 0 0
1856 14 0 ie) 0 16 0 0O 0 0 13 16 0 0
1856 15 it) 0 0 16 0 0 0 0 ll 0 12 Q
1856 «16 0 QO 12 16 0 0 0 11 0 io} 18 it)
1856 (17 0 0 0 15 it} te) 0 12 0 12 15 13
1856 18 le) 0 0 1 0 ie) 0 11 0 0 14 13
1856 «19 16 0 0 16 0 0 i) 11 0 0 1 13

0 12 0 27 iv} 0 0 0 0

0 15 0 12 0 0 0 0 0

0 15 0 0 0 0 0 0 QO

0 15 i) 9 0 oO 0 QO

0 15 0 ie) 0 O 0 QO

0 0 0 0 0 0 0 0

0 i} 0 0 0 0 0 0

0 0 0 0 0 0 0 0

id) 0 0 ie) 0 i) 0

id) 0 0 0 0 i) 0

0 0 0 0 0 0

0 0 0

40



DAILY SUNSPOT NUMBERS 1918

1918
1918
1918
1918
1918
1918
1918
1918
1918
1918
1918
1918
1918

89.4 107.6

101.7

Apr May dun Jul Aug Sep Oct Nov
63 49 81 52 29 53 70 106
51 63 104 73 14 38 52 96
88 89 96 91 25 $2 47 92
86 98 118 70 46 59 29 81
67 113 121 63 59 56 34 63
63 126 134 36 47 42 26 42
79 109 107 47 70 48 40 40
72 106 87 30 61 55 §3 40
74 117 67 35 66 47 66 39
68 98 88 62 72 47 80 37
37 83 79 61 72 53 85 32
30 68 92 79 83 65 116 39
28 67 124 83 70 53 95 23
4. 59 117 94 104 $3 87 15
29 66 97 128 112 $3 61 15
13 77 125 80 109 35 56 14
29 106 107 74 110 40 37 10
18 146 111 58 105 38 34 7
20 158 149 65 105 27 18 Vv
16 160 142 53 101 50 19 15
25 124 145 46 115 52 23 ll
33 109 153 62 97 61 14 18
29 91 152 66 72 73 13 23
58 95 125 87 63 89 16 50
69 61 114 92 68 62 24 61
75 65 123 74 61 79 33 38
61 52 129 87 38 $2 46 44
79 44 116 $9 32 52 57 $7
73 24 77 34 40 84 99 63
79 49 55 40 39 74 93 61

60 25 55 113
51.8 88.1 111.2 64.7 69.0 54.7 52.8 42.0



DAILY SUNSPOT NUMBERS 1936



WORLD DATA CENTER A
for

Solar-Terrestrial Physics

REPORT UAG-95

SUNSPOT NUMBERS: 1610-1985

based on

The Sunspot-Activity in the Years 1610-1960

January 1987

Swiss Federal
Observatory





The tables for 1610-1960 appeared first in The Sunspot-Activity in the Years 1610~
1960, by Prof. M. Waldmeier, Copyright 1961, Swiss Federal Observatory, Zurich,
Switzerland. Waldmeier's text has been revised and edited.

U.S. DEPARTMENT OF COMMERCE

NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

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National Geophysical Data Center

325 Broadway, Boulder, Colorado 80303 USA



UAG SERIES OF REPORTS

Fewer than four UAG Reports are published at irregular intervals each year. Copies of these publications
may be purchased through the NATIONAL GEOPHYSICAL DATA CENTER, Solar-Terrestrial Physics Division (E/GC2)
325 Broadway, Boulder, Colorado 80303, USA. A $3.00 handling charge per order will be added to single-
copy price, if any, listed below. Please note, too, that some reports are available on microfiche only.
Orders must include check or money order payable in U.S. currency to Commerce, NOAA/NGDC.

UAG- 1

UAG- 2

UAG- 3

UAG- 4

UAG- 5

UAG- 6

UAG- 7

UAG- 8

UAG- 9

UAG-10

UAG-11
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UAG-13

UAG~-14

UAG-15
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UAG-17

UAG-18

IQSY NIGHT AIRGLOW DATA, by L.L. Smith, F.E. Roach, and J.M. McKennan, ESSA Aeronomy Laboratory
Boulder, CO, July 1968, 305 pp, $1.75.

A REEVALUATION OF SOLAR FLARES, 1964-1966, by Helen W. Dodson and E. Ruth Hedeman, McMath-Hul-
bert Observatory, University of Michigan, Pontiac, MI, August 1968, 28 pp.

OBSERVATIONS OF JUPITER'S SPORADIC RADIO EMISSION IN THE RANGE 7.6-41 MHZ, 6 JULY 1966 THROUGH
8 SEPTEMBER 1968, by James W. Warwick and George A. Dulk, University of Colorado, Boulder, CO,
October 1968, 35 pp.

ABBREVIATED CALENDAR RECORD 1966-1967, by J. Virginia Lincoln, Hope 1. Leighton and Dorothy K.
Kropp, ESSA [now NOAA], Aeronomy and Space Data Center, Boulder, CO, January 1969, 170 pp

DATA ON SOLAR EVENT OF MAY 23, 1967, AND ITS GEOPHYSICAL EFFECTS, compiled by J. Virginia Lin-
cola, world Data Center A, Upper Atmosphere Geophysics, ESSA [now NOAA], Boulder, CO, February
> 120 pp.

INTERNATIONAL GEOPHYSICAL CALENDARS 1957-1969, by A.H. Shapley and J. Virginia Lincoln, ESSA Re-
search Laboratories [now NOAA], Boulder, CO, March 1969, 25 pp.

OBSERVATIONS OF THE SOLAR ELECTRON CORONA: FEBRUARY 1964 - JANUARY 1968, by Richard T. Hansen,
High Altitude Observatory, NCAR, Boulder, CO, and Kamuela, HI, October 1969, 12 pp

DATA ON SOLAR-GEOPHYSICAL ACTIVITY OCTOBER 24 - NOVEMBER 6, 1968, Parts 1 and 2, compiled by J.
Virginia Lincoln, World Data Center A, Upper Atmosphere Geophysics, ESSA [now NOAA], Boulder,
CO, March 1970, 312 pp, $1.75 (includes Parts 1 and 2).

DATA ON COSMIC RAY EVENT OF NOVEMBER 18, 1968, AND ASSOCIATED PHENOMENA, compiled by J. Virginia
Lincoln, Wortd Data Center A, Upper Atmosphere Geophysics, ESSA [now NOAA], Boulder, CO, April
1970, 109 pp.

ATLAS OF IONOGRAMS, edited by A.H. Shapley, ESSA Research Laboratories [now NOAA}, Boulder, CO,
May 1970, 243 pp, $1.50.

[Superseded by UAG-30]

SOLAR-GEOPHYSICAL ACTIVITY ASSOCIATED WITH THE MAJOR GEOMAGNETIC STORM OF MARCH 8, 1970, Parts
1, 2 and 3, compiled by J. Virginia Lincoln and Dale B. Bucknam, World Data Center A, Upper At-
mosphere Geophysics, ESSA [now NOAA], Boulder, CO, April 1971, 466 pp, $3.00 (includes 3 parts).

DATA ON THE SOLAR PROTON EVENT OF NOVEMBER 2, 1969, THROUGH THE GEOMAGNETIC STORM OF NOVEMBER 8-
10, 1969, compiled by Dale B. Bucknam and J. Virginia Lincoln, World Data Center A, Upper Atmos~
phere Geophysics, ESSA [now NOAA], Boulder, CO, May 1971, 76 pp.

AN EXPERIMENTAL, COMPREHENSIVE FLARE INDEX AND ITS DERIVATION FOR 'MAJOR' FLARES, 1955-1969, by
Helen W. Dodson and E. Ruth Hedeman, McMath-Hulbert Observatory, University of Michigan, Pon-
tiac, MI, July 1971, 25 pp.

{Superseded by UAG-30]

TEMPORAL DEVELOPMENT OF THE GEOPHYSICAL DISTRIBUTION OF AURORAL ABSORPTION FOR 30 SUBSTORM
EVENTS IN EACH OF IQSY (1964-65) AND IASY (1960), by F.T. Berkey, University of Alaska, Fair-
banks, AK; V.M. Driatskiy, Arctic and Antarctic Research Institute, Leningrad, USSR; K. Henrik-
sen, Auroral Observatory, Tromso, Norway; D.H. Jelly, Communications Research Center, Ottawa,
Canada; T.I. Shchuka, Arctic and Antarctic Research Institute, Leningrad, USSR; A. Theander,
Kiruna Geophysical Observatory, Kiruna, Sweden; and J. Yliniemi, University of Oulu, Qulu, Fin-
land, September 1971, 131 pp, $1.50 (microfiche only).

1ONOSPHERIC DRIFT VELOCITY MEASUREMENTS AT JICAMARCA, PERU (JULY 1967 - MARCH 1970), by Ben B.
Balsley, NOAA Aeronomy Laboratory, Boulder, CO, and Ronald F. Woodman, Jicamarca Radar Observa-
tory, Instituto Geofisico del Peru, Lima, Peru, October 1971, 45 pp, $1.50 (microfiche only).

A STUDY OF POLAR CAP AND AURORAL ZONE MAGNETIC VARIATIONS, by K. Kawasaki and S.-I. Akasofu,
University of Alaska, Fairbanks, AK, June 1972, 21 pp.

107



DAILY SUNSPOT NUMBERS 1832

1833 01 0 ty) 0 16 7 0 0 0 0 0 te) 15
1833 02 0 0 0 0 15 0 0 0 0 0 14
1833 03 0 0 0 0 17 0 0 0 te} 0 14 15
1833 04 0 0 0 16 lt} le) 15 if) 14
1833 05 0 le) 0 ie} 19 id) 0 al to) 15
183306 0 0 0 0 15 0 0 22 0 14 21
1833 07 0 0 ie) 17 0 0 ral lo} 19 15 21
1833 08 0 0 0 27 0 0 22 le} 37 14 13
183309 0 0 0 16 0 14 v7 le} 41 14 13
1833-10 0 0 0 ie} 7 0 ie} 17 14 14
183311 0 29 0 ie) 0 V7 0 32 15 14 14
1833 12 20 27 32 0 0 0 0 15 14 4 13
183313 15 27 0 ie) 0 15 0 7 0
1833-14 0 15 0 0 0 14 0 16 15 0
183315 29 16 ie) 0 15 0 15 is)
1833-16 39 14 13 0 14 0 27 i)
1833) «17 37 QO 15 0 14 0 61 ta) 0
1833-18 7 40 0 15 le} 14 0 14 is)
1833 19 31 15 0 31 0 0 18
1833 20 50 36 14 to) 7 0 24 0 0 ie) 7
1833 21 14 0 15 0 0 0
1833 22 14 14 15 0 20 0
1833 23 32 15 ie) 21 0 0 0
1833 24 15 0 0 34 0 te) 7 0 0
1833 25 47 20 0 0 32 0 16 ty) 0 0
1833 26 39 29 14 lo) 0 0 0 13 0 0 0
1833 27 0 32 0 0 0 0 0 id 0
1833 28 29 0 30 le) 0 to) 0 to} 0 0
1833 29 15 15 14 0 0 0 0 0

0 to) 0 0 0 5

0 0 i)



DAILY SUNSPOT NUMBERS 1950

Year Day dan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1950 01 101 60 95 72 144 88 70 94 49 41 78 82
1950 02 100 38 75 80 146 84 58 110 59 41 62 80
1950 03 92 33 90 122 132 84 58 106 49 4l 57 82
1950 04 84 36 128 133 130 66 66 84 51 50 67 75
1950 05 76 53 134 136 129 58 75 90 31 50 79 61
1950 06 85 43 148 139 139 54 88 83 27 45 94 46
1950 07 84 32 184 151 130 50 98 76 23 54 80 85
1950 08 86 20 187 114 121 70 77 72 24 78 55 108
1950 09 64 29 163 120 108 65 67 70 38 84 61 94
1950 10 83 43 150 109 105 108 68 75 31 79 60 94
1950 11 75 66 156 88 101 102 78 70 28 68 46 96
1950 12 85 72 128 91 71 72 68 74 37 88 48 115
1950 13 83 85 124 95 69 95 67 84 65 75 42 94
1950 14 80 125 133 97 60 101 98 68 85 72 61 79
1950 15 75 144 130 103 47 94 75 80 80 106 81 59
1950 16 70 156 110 120 57 84 89 93 83 103 62 42
1950 17 82 154 100 120 61 83 96 106 85 99 66 26
1950 18 91 166 108 85 79 78 83 93 87 74 58 19
1950 19 110 197 101 90 86 78 102 114 80 50 50 7
1950 20 130 190 90 93 89 66 130 113 65 48 36 ie)
1950 21 155 170 80 85 92 55 108 103 58 27 22 7
1950 22 163 162 70 70 112 86 125 95 51 20 18 0
1950 23 150 137 76 96 128 107 115 115 44 22 16 ie)
1950 24 157 113 72 128 162 108 108 103 56 32 13 31
1950 25 140 96 73 138 142 128 96 92 41 30 20 39
1950 26 130 80 80 142 134 113 118 77 45 37 32 56
1950 27 110 73 73 119 131 97 112 76 49 $1 64 58
1950 28 11 82 69 160 121 74 110 55 38 55 74 35
1950 29 98 97 153 109 82 112 58 49 95 69 41
1950 30 118 100 154 86 78 106 $8 32 107 73 23
1950 31 82 78 72 100 54 80 43
Mean 101.6 94.8 109.7 113.4 106.2 83.6 91.0 85.2 51.3 61.4 54.8 54.1

1951 O01 32 97 74 41 62 38 Vv 64 46 41 45 32
1951 02 22 84 62 27 56 38 16 71 47 44 $7 24
1951 03 32 62 50 24 78 37 36 55 48 43 46 20
1951 04 42 53 45 20 51 26 50 87 55 38 53 22
1951 05 42 60 38 40 46 65 32 73 64 31 61 20
1951 06 64 46 50 61 20 103 56 74 84 19 56 34
1951 07 71 43 55 69 26 115 63 83 77 16 62 4.
1951 08 75 53 54 78 7 130 86 102 g1 25 43 54
1951 09 60 60 33 75 32 138 105 121 108 54 61 42
1951 10 57 70 26 74 84 137 109 132 118 71 62 22
1951 11 54 74 40 84 102 133 112 121 129 81 76 22
1951 12 46 69 61 88 125 147 96 112 123 95 65 28
1951 13 7 63 43 78 155 159 95 82 114 72 41 31
1951 14 26 67 36 103 170 163 92 66 110 52 40 26
1951 15 15 63 26 118 184 158 90 62 100 63 40 40
1951 16 16 54 31 126 212 147 40 58 89 67 50 49
1951 17 30 50 26 130 220 152 45 54 93 56 46 59
1951 18 35 38 35 148 229 157 48 49 98 58 44 63
1951 19 45 36 38 150 204 146 40 66 89 81 42 62
1951 20 40 4 49 132 180 138 33 67 91 78 43 68
1951 21 50 44 59 149 180 134 26 54 104 43 45 76
1951 22 $1 51 60 144 154 123 28 62 109 32 $2 102
1951 23 63 55 83 140 140 93 70 38 104 21 54 106
1951 24 77 61 110 119 117 63 78 42 80 14 54 66
1951 25 90 67 108 115 114 60 61 24 76 22 54 52
1951 26 105 72 97 103 93 63 $2 8 70 41 60 29
1951 27 115 80 84 110 87 48 60 6 63 55 75 27
1951 28 130 65 74 96 81 45 79 8 58 7 59 41
1951 29 120 70 81 $1 43 61 24 23 73 55 43
1951 30 126 65 65 48 18 66 15 31 72 31 50
195131 11 $2 46 58 40 70 68
Mean 59.9 59.9 §5.9 92.9 108.5 100.6 61.5 61.0 83.1 51.6 52.4 45.8



DAILY SUNSPOT NUMBERS 1940



May Jun dul Aug Sep Oct Nov Dec

MONTHLY MEAN SUNSPOT NUMBERS (Continued)
Apr

Mar

1808
1809
1810

Feb

dan

Year

moo
Noo

noo
ooo
a

noo
TOO

nto

doo
a

ono
ooo

Nmo
ooo

ono
ano
a

noo
oS
a

mno
ANS
a

eno
00

nao
FAS

eno

The value shown was interpolated from the January

10

a
“

31.6 38.4 24.6 17.6

and March monthly means of that year.

1866
*No observations were available during February 1824.


DAILY SUNSPOT NUMBERS 1880

Year Day dan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1880 «01 0 40 20 16 40 40 35 17 34 76 49 15
1880 02 4 40 18 18 39 41 34 22 32 72 $1 26
1880 03 17 55 WV 28 47 32 28 18 21 75 50 21
1880 04 33 47 18 34 35 27 22 30 44 47 37 32
1880 05 33 45 0 25 34 9 34 27 38 43 25 38
1880 06 46 48 15 22 32 14 37 30 61 56 0 37
1880 07 46 52 19 14 18 13 41 40 68 4) ra 39
1880 08 48 64 29 14 20 13 31 52 101 45 0 33
1880 09 38 70 31 23 19 23 27 $1 110 36 4 24
1880 10 38 52 32 24 16 35 6 64 97 40 0 2.
1880 11 37 33 27 19 26 31 5 65 102 40 4 17
1880 12 46 37 23 21 7 19 0 75 88 40 5 15
1880 13 $1 43 49 27 20 17 0 76 86 52 19 15
1880 14 37 21 32 23 7 19 0 78 89 35 20 11
1880 «15 41 0 32 18 0 13 0 93 70 31 21 0
1880 16 31 0 25 4 14 19 4 89 31 32 19 23
1880 17 32 0 26 0 0 32 io) 92 37 31 39 28
1880 «18 28 0 26 14 0 44 13 94 50 26 49 28
1880 19 24 0 20 id) 5 $2 13 88 71 47 48 29
1880 20 13 0 13 4 16 $4 25 66 55 66 55 18
1880 21 0 13 0 4 15 $2 22 41 $1 63 45 24
1880 9-22 ie) 4 0 29 9 56 42 37 54 38 46 51
1880 923 0 14 0 8 0 61 30 46 48 50 26 54
1880 24 0 15 0 14 19 61 33 15 52 52 39 57
1880 25 ie) 16 4 18 23 41 36 14 52 30 35 37
1880 26 8 14 6 30 44 43 45 7 70 19 59 49
1880 27 ty) 13 18 34 27 44 23 14 78 42 44 32
1880 28 28 19 17 32 32 59 33 40 91 28 49 34
1880 29 13 23 19 23 47 34 30 36 99 23 32 34
1880 = 30 25 32 44 50 26 16 31 101 22 29 39
1880 31 28 30 48 13 34 35 38
Mean 24.0 27.2 19.3 19.5 23.5 34.1 21.9 48.1 66.0 43.0 30.7 29.6
DAILY SUNSPOT NUMBERS 1881
Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1681 O01 40 67 4 37 15 64 98 134 110 69 17 25
1881 02 $1 63 v7 40 13 59 105 113 79 67 25 57
1881 03 39 46 16 44 4 72 75 98 2 86 8 60
1881 04 41 39 il 47 18 71 78 60 54 74 13 62
1881 05 15 26 9 48 43 45 95 49 67 61 18 63
1881 406 21 $4 1 45 51 40 65 $5 i) 58 24 65
1881 07 13 70 16 43 51 24 53 58 64 62 50 $1
1881 08 19 59 16 $1 62 51 59 57 51 53 34 68
1881 09 al 47 72 52 56 50 46 40 49 49 $7 39
1881 10 14 38 $8 32 a7 49 64 36 35 70 82 61
1881 11 20 38 65 31 39 65 65 37 66 61 75 72
1881 12 14 33 96 45 7 58 60 36 77 51 76 7
1881 13 9 39 120 56 30 76 70 18 75 45 112 77
1881 «14 0 47 145 50 35 76 63 0 72 53 95 99
188115 37 57 139 73 31 71 65 ie) 67 47 82 83
1881 16 36 61 116 36 38 72 55 i} 65 60 70 57
1881 («17 49 66 111 82 33 62 40 20 43 71 88 56
1881 «18 42 48 77 88 37 61 60 19 27 68 86 46
1881 19 64 43 69 51 52 53 60 20 53 73 75 27
1881 20 43 45 81 74 53 44 47 33 44 75 43 34
1881021 45 78 53 81 59 25 53 16 39 90 75 34
1881 922 28 78 37 78 41 21 64 32 32 106 74 $1
1881 923 27 68 58 70 58 50 82 47 27 100 86 34
1881 924 36 63 35 70 48 45 98 57 27 90 70 5
1881 «25 41 69 33 65 35 80 88 70 29 86 60 ie)
1881 26 32 61 22 65 44 92 94 99 26 74 31 19
1881 27 57 54 24 44 47 91 114 100 47 70 22 19
1881 28 57 32 17 18 69 88 109 108 39 51 52 19
1881 29 78 19 24 64 74 115 132 63 24 10 36
1881 30 75 25 9 85 86 122 138 87 28 35 36
188131 63 23 75 122 127 23 34
Mean 36.4 53.2 §1.5 51.6 43.5 60.5 76.9 58.4 53.2 64.4 54.8 47.3



DAILY SUNSPOT NUMBERS 1964

Year Day dan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1964 «(O1 0 0 27 10 7 8 7 9 7 7 9 0
1964 02 14 iv 8 0 0 8 0 20 8 12 8 0
1964 03 8 0 13 13 0 8 0 17 8 0 8 0
1964 04 7 ie) 7 0 10 8 8 9 0 Q 0 0
1964 05 13 0 7 10 14 0 10 8 0 0 0 7
1964 06 7 0 it} 11 11 O 8 7 0 14 7 0
1964 07 20 10 15 15 11 14 7 7 7 20 7 0
1964 08 16 13 9 13 10 0 id 9 20 16 7 8
1964 09 13 18 8 10 7 7 i} ie) 12 il 0 7
1964 10 15 9 0 9 7 7 0 7 il 0 0 10
1964 il 19 7 14 7 4 0 8 il 0 ie) 12
1964 12 20 0 23 7 0 22 0 rau 20 0 9 16
1964 13 27 0 40 7 0 12 0 23 18 0 7 10
1964-14 24 8 32 7 9 18 10 36 11 0 7 17
1964 «15 22 13 29 7 v7 24 12 30 0 0 8 10
1964 16 16 Vv 28 7 17 23 11 30 0 0 16 7
1964 «17 20 21 20 13 23 13 9 19 QO Qo 15 27
1964 «18 7 is 8 7 11 22 8 9 0 12 19 28
1964 «19 14 13 10 ie) 9 24 0 8 ie) 11 12 30
1964 20 1. 23 ll 9 7 19 0 7 ie) 10 19 29
1964 21 i 39 20 19 7 9 i) 7 ie) tt) 21 23
1964 22 ll 42 32 17 18 0 i} 0 0 is) 8 26
1964 23 lL 54 30 16 13 0 0 0 0 0 0 16
1964 24 18 44 27 23 ll 0 te) 0 0 7 8 18
1964 25 17 36 23 12 11 0 i) 0 0 8 9 19
1964 26 10 34 20 7 14 0 0 0 0 7 ie) 14
1964 27 9 34 16 0 8 0 0 0 0 9 iS) 19
1964 28 24 34 14 0 8 0 it) it} 0 i} 7 28
1964 29 27 28 7 0 8 7 0 0 0 9 0 38
1964 30 22 7 0 9 7 0 0 7 16 0 21
1964 31 ll 7 9 7 7 9 19
Mean 15.3 177 16.5 8.6 9.5 9.2 3.1 9.3 4.7 6.1 7.4 16.1
DAILY SUNSPOT NUMBERS 1965
Year Day dan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1965 OL 23 14 16 0 0 9 18 0 20 52 29 13
1965 02 26 13 7 0 4 24 20 0 20 63 28 8
1965 03 31 13 0 0 8 36 19 15 al 60 20 8
1965 04 31 13 8 Q 8 38 7 14 22 62 13 8
1965 05 26 10 13 0 7 34 8 0 22 55 13 8
1965 06 19 23 26 0 0 30 7 16 19 39 29 8
1965 07 18 23 26 0 11 32 22 7 23 27 40 8
1965 08 V7 7 7 0 15 24 29 31 22 7 46 15
1965 09 1 23 ta) 0 9 23 33 12 18 8 38 7
1965 10 8 17 12 0 0 9 29 14 15 13 41 7
1965 11 7 17 9 id) QO 7 35 16 19 8 40 0
1965 12 0 23 18 9 15 0 30 13 v7 9 26 0
1965 «13 i} 25 16 9 21 0 23 8 17 8 7 14
1965 14 7 16 17 15 15 14 12 7 8 7 16 ie)
1965 15 8 23 12 27 30 0 ll 0 8 0 10 4
1965 16 7 15 9 18 36 ie) 8 0 16 7 9 22
1965 17 7 8 11 7 55 12 7 0 8 0 7 ras
1965 18 20 8 22 8 72 25 0 7 9 ie) 0 20
1965 19 22 ie) V7 7 75 16 0 7 7 10 0 18
1965 20 28 ie) 19 7 72 21 0 7 0 12 0 15
1965 21 23 7 9 9 70 19 0 7 0 18 0 10
1965 22 22 ie) 0 15 62 14 ie) 0 i) 26 7 11
1965 23 13 0 0 v7 50 7 0 0 11 23 0 9
1965 24 19 13 7 10 43 7 0 8 7 16 7 8
1965 25 18 15 7 7 30 7 7 0 13 24 i) 12
1965 26 18 22 10 11 22 7 0 8 17 7 7 23
1965 27 34 23 18 10 7 8 7 14 24 7 ie) 29
1965 28 17 18 12 8 0 23 0 12 23 9 8 64
1965 29 25 9 0 0 18 0 16 37 8 8 64
1965 30 22 9 0 id 14 9 15 50 8 15 44
1965 31 15 8 ie) 7 22 14 38
Mean 17.5 14.2 11.7 6.8 24.1 15.9 11.9 8.9 16.8 20.1 15.8 17.0



Year Day
1922 O01
1922 02
1922 03
1922 04
1922 (05
1922 06
1922 07
1922 08
1922 09
1922 10
1922 11
1922 12
1922 13
192214
1922) 15
1922 16
1922 «17
1922 18
1922 «(19

1923 01
1923 02
1923 03
1923 04
1923. 05
1923 06
1923 07
1923. 08
1923. 09
1923 10
1923 11
1923, 12
1923) 13
1923 14
1923 15
1923 16
1923) «17
1923, 18
1923. 19
1923 20
1923 21
1923 22
1923 23
1923 24
1923 25
1923 26
1923 27
1923 28
1923 29
1923 30
1923, 31

eoDeDCCDCCOROOGD00

ee
ORBmecc0mN~

eocoeceseocCD

mie
PON@VOSRONCCONDOO

DAILY SUNSPOT NUMBERS 1922

e
PUT SoorPHrarnseNccccome

woccDD000C000

lun Jul
7 0
0 0
0 0
0 0
0 15
0 24
8 19
7 29
7 28
0 16
18 7
23 7
7 0
16 0
16 0
10 0
9 0
0 0
0 19
0

9

7

7

7

7

0

i)

0

0

0

16 18
10 17
10 8
0 it)

0 0

0 0

0 0

0 0

io) 0

i} 0

0 0

0 0)

0 lo}

i) 0

0 0

0 0

0 0

13 0
13 0
8 0

9 0

8 8

7 7

7 7

38 7
24 7
23 0
20 0
31 10
37 14
7

Bb

ee

-

mr

eo oe



DAILY SUNSPOT NUMBERS 1844

0
0
0
0
0
0
0
0
1844 21 32 14 44 7 30 0 ral 0 34
1844 22 14 20 16 14 30 0 19 0 47
1844-23 16 31 20 15 0 22 0 7 0 25
1844 24 0 17 46 14 1 0 22 0 V7 30
1844 25 31 36 39 14 1 0 21 0
0
0
0
0
0



DAILY SUNSPOT NUMBERS 1868

1868 = O01 20 10 27 51 22 71 39 37 0 64 137 43
1868 02 14 19 7 44 19 62 48 42 31 42 115 33
1868 03 18 21 20 45 10 40 43 Vv 43 35 111 51
1868 04 18 il 19 51 30 45 33 19 23 46 52 51
1868 05 19 16 26 54 32 30 0 33 48 29 72 34
1868 06 25 10 34 53 33 16 0 19 50 49 55 34
1868 07 35 10 ie) 44 21 24 0 23 57 49 52 41
1868 08 45 10 0 35 37 56 0 26 50 41 49 73
1868 09 60 0 14 18 37 v7 0 26 60 30 46 97
1868 10 45 21 v7 19 $1 29 0 33 72 29 43 121
1868 11 40 14 30 27 61 0 0 21 80 66 40 97
1868 «612 7 16 17 37 30 0 0 15 70 52 36 100
1868 13 20 10 30 42 26 1 0 22 82 $1 42 92
1868 «14 36 0 30 46 16 10 0 35 62 33 36 73
1868 «15 15 0 44 46 16 10 10 62 73 33 60 72
1868 «16 0 0 50 72 12 22 15 50 67 34 61 56
1868 «17 0 10 50 43 29 27 33 31 54 31 58 15
1868 «18 Q 37 25 51 35 28 43 60 31 37 62 15
1868 19 0 34 24 55 4 37 54 55 36 57 82 12
1868 20 Le) 34 43 27 34 30 47 87 40 64 43 30
186821 oO 34 30 23 34 10 58 45 30 71 58 82
1868 = 22 ie) 25 ie) 37 26 33 58 42 36 69 41 71
1868 23 id) 12 11 33 16 30 38 31 34 84 4l 79
1868 24 id) 16 16 16 0 31 64 30 43 52 67 101
1868 925 ie) 26 24 10 0 43 64 4s 35 58 54 79
1868 26 ie} 0 30 18 0 35 68 35 33 76 58 79
1868 27 15 23 24 18 19 27 56 74 42 99 55 90
1868 928 0 22 39 14 32 57 30 37 30 141 52 89
1868 29 0 is 42 36 16 45 36 22 49 99 49 136
1868 30 22 43 34 50 56 34 8 54 147 46 103
1868 931 18 44 42 27 14 142 47
Mean 18.6 15.7 26.5 36.6 26.7 31.1 29.0 34.4 47.2 61.6 59.1 67.6
DAILY SUNSPOT NUMBERS 1869
Year Day Jan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1869 01 91 91 37 34 99 112 77 39 48 88 94 133
1869 02 109 119 40 14 124 152 58 45 56 65 63 130
1869 03 111 97 37 13 120 159 55 67 76 73 60 100
1869 04 91 127 43 22 113 136 42 48 73 91 55 70
1869 05 106 84 71 29 139 192 75 43 115 110 69 85
1869 06 69 76 69 10 124 172 75 19 94 94 67 100
1869 07 62 63 28 0 157 124 70 43 142 93 66 125
1869 08 55 42 67 13 139 115 62 50 126 66 44 116
1869 09 45 24 25 25 136 126 54 57 157 69 70 97
1869 10 40 16 40 31 154 127 45 68 139 62 37 91
1869 «11 46 40 46 39 151 101 14 104 99 65 52 187
1869 12 84 70 85 48 158 92 10 137 82 52 70 156
1869 «13 89 64 108 42 157 59 31 121 91 70 80 160
1869 14 84 93 113 61 163 67 to) 117 54 70 91 88
1869 15 83 76 75 42 142 80 25 169 81 85 100 124
1869 16 74 73 36 45 104 55 57 154 91 88 109 132
1869 17 57 $5 73 40 76 73 99 148 102 54 53 157
1869 18 4l $1 59 66 83 88 64 76 51 73 123 130
1869 «19 26 51 67 47 44 86 108 119 70 34 94 100
1869 20 30 49 93 34 24 80 142 101 67 34 53 93
1869 21 34 59 97 66 37 129 110 124 26 34 69 118
1869 922 20 50 42 36 34 112 106 73 16 34 70 88
1869 23 19 40 36 16 19 136 71 99 36 56 70 82
1869 24 20 30 28 18 48 139 67 78 47 37 135 70
1869 25 51 21 23 18 47 135 16 71 56 19 120 63
1869 26 34 44 18 54 61 105 33 74 99 19 100 60
1869 27 37 37 21 61 118 83 2B 69 99 19 90 $2
1869 28 52 34 38 86 100 88 58 76 86 19 80 62
1869 29 67 34 109 121 73 52 34 78 52 70 73
1869 30 71 49 li 115 55 36 23 62 55 88 112
1869 31 91 36 115 51 22 59 81
Mean 60.9 $9.9 $2.7 41.0 103.9 108.4 59.2 79.6 80.6 59.3 78.1 104.3



DAILY SUNSPOT NUMBERS 1878

1878 01 0 it} le) 0 0 32 0 ie) 0 0 13 0
1878 02 0 6 le) Q 0 28 0 0 5 le} 16 0
1878 03 0 25 15 3 te} 30 0 0 13 0 16 0
1878 904 0 39 27 0 0 23 0 0 14 ie} 14 0
1878 05 0 37 29 9 le} 5 Q 0 14 0 9 0
1878 06 0 27 WV i 0 4 0 0 15 0 13 0
1878 07 0 24 2 i ie} 0 0 0 15 iv 13 0
1878 08 to) 25 13 9 0 0 0 0 13 0 8 0
1878 09 0 2 4 ie) 0 0 it) 0 13 0 8 0
1878 =©10 0 0 0 0 oO 0 0 le) 16 te} 0 0
1878 «11 QO Q 10 i) 0 0 0 lo) 13 0 0 0
1878 12 0 0 18 0 te} 0 0 0 16 0 le} io}
1878 «13 0 0 18 0 0 to) 0 a) 1 0 0 0
1878 14 0 id 20 0 0 0 0 it) it) 0 ie} 0
1878 «15 1 0 21 0 0 0 0 0 0 0 0 0
1878 16 0 9 19 0 0 0 0 0 0 0 0 0
1878 «17 0 0 16 le) 0 0 0 0 0 0 0 0
1878 «18 oO io) 11 0 0 0 Q le) i i) oO it}
1878 «19 0 0 0 io) 0 0 0 0 le) 0 2 16
1878 20 0 O 0 i} it} 0 ie) 0 0 i) it) 1
1878 21 13 tt) 0 Oo) 8 ie} to) 0 0 0 9 0
1878 22 4 0 ie} ty) 3 ie} ty) 0 0 0 0 i)
1878 23 14 0 3 QO id 3 to) 0 0 0 0 i)
1878 «24 17 0 0 iu ie) 6 0 0 0 0 i) i)
1878 25 15 0 0 0 9 0 0 i 0 0 0 ty)
1878 926 18 0 0 0 16 7 4 ie} 0 0 0 0
1878 927 14 le) 0 0 21 20 0 0 0 i) 0 0
1878 28 7 0 ie} 0 22 16 0 0 0 lo) 0 0
1878 29 0 id Le} 22 9 0 ie} ie} 13 0 0
1878 30 ie) 0 0 39 0 0 0 0 13 1 0
1878 31 QO 0 43 ie) 0 9 0

1879 01 id 0 le) 9 0 id al 0 16 8 0 9
1879 02 3 0 to) 0 0 0 25 0 14 11 0 17
1879 03 0 0 ty) 0 le} te) 32 0 14 15 0 13
1879 04 4 it} 0 ie) QO 4 18 0 i 0 4 15
187905 io) 0 0 0 0 v7 4 0 13 lo} 13 9
1879-06 0 vo} 0 0 0 4 4 0 16 0 13 1
1879 07 0 0 0 0 9 0 0 0 il 7 37 0
1879 08 0 Q 0 0 12 le) 5 0 0 16 38 0
1879 09 0 0 0 0 10 ie) 5 0 0 22 37 12
1879 10 0 0 0 0 7 8 15 17 0 26 37 4
1879 «il i) i) 0 6 16 4 20 20 3 22 24 0
1879 12 le) 0 0 6 16 0 16 34 4 24 7 0
1879 13 0 0 0 15 4 tt) 16 28 0 33 22 0
187914 i) 8 0 16 0 0 4 al 0 35 16 0
187915 0 8 0 18 it 0 12 7 0 23 7 i)
1879-16 0 0 io} 25 0 0 12 2 ta) 3 13 0
1879 «17 0 0 0 22 0 0 4 0 0 24 11 a
1879 «18 0 0 0 20 i} 0 i) 0 3 30 8 16
1879 19 le} 0 0 li 0 to} 0 0 0 27 0 18
1879 20 0 le) 0 12 0 0 0 0 0 24 0 14
1879 21 0 le) 0 16 0 0 0 Lo} 0 18 0 15
1879 22 0 le) 0 12 0 0 0 0 0 12 0 13
1879 23 0 9 0 8 to) 0 0 18 5 0 0 12
1879 24 i) i) 0 0 0 0 te) 22 12 le) le) 14
1879 25 0 0 0 9 0 0 3 20 12 to) le) 16
1879-26 0 0 0 0 0 13 0 13 12 0 18 0
1879 27 io} 0 0 0 0 22 to) 26 14 0 14 0
1879.28 5 0 0 ie) le) 27 5 27 6 0 16 4
1879 29 to} 0 0 le) 23 3 36 W 0 24 3
1879 30 5 9 ce} ie) ral 0 27 5 0 14 0
1879 31 14 te) 0 0 15 0 0



DAILY SUNSPOT NUMBERS 1870

Year Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1870 O01 88 94 143 192 139 124 205 157 278 136 115 144
1870 02 88 89 195 190 131 130 187 112 216 133 172 108
1870 03 87 119 150 196 139 127 151 112 189 148 195 211
1870 04 85 94 163 202 139 91 148 118 166 133 212 208
1870 05 79 147 204 205 163 91 151 112 141 130 187 217
1870 06 79 115 169 217 178 119 94 139 133 91 240 196
1870 07 76 100 187 235 156 82 133 97 103 109 159 178
1870 608 $5 108 109 256 176 79 145 70 46 103 255 191
1870 4609 94 100 152 241 145 99 130 70 38 129 242 154
1870 10 76 99 135 165 188 81 130 70 55 124 187 198
1870) «il 121 139 136 163 186 76 148 79 32 130 155 172
1870 12 82 95 139 118 198 109 136 121 49 142 193 150
1870 13 86 102 136 130 193 94 169 94 49 178 174 142
1870 «14 58 190 130 169 232 112 184 119 81 187 183 176
1870) «15 100 141 176 109 222 g1 181 118 76 141 178 160
1870 «16 90 166 164 70 226 111 169 151 85 205 178 160
1870 «17 79 190 150 79 214 100 141 151 88 220 151 162
1870 18 79 181 130 88 247 130 133 124 163 184 118 109
1870 «419 78 163 115 88 231 184 133 109 148 151 109 178
1870 20 77 156 142 115 237 204 139 94 196 174 127 146
1870 21 76 110 126 154 2li 181 142 114 187 196 98 99
1870 22 76 82 136 190 162 208 88 118 196 166 103 80
1870 923 74 67 144 172 154 196 85 145 181 142 97 22
1870 24 75 52 187 166 139 172 103 145 178 154 100 40
1870 25 61 50 187 157 142 166 121 246 194 145 76 44
1870 26 61 55 180 160 181 194 118 317 187 121 55 35
1870 27 60 76 180 154 139 178 133 312 184 130 73 51
1870 28 58 138 183 141 151 163 83 288 172 135 68 57
1870 29 82 188 126 184 178 79 311 150 157 103 69
1870 30 54 189 151 145 199 85 284 118 112 123 91
1870 31 61 189 109 90 271 132 81
Mean 77.3, 114.9 157.6 160.0 176.0 135.6 132.4 153.8 136.0 146.4 147.5 130.0

1871 01 102 94 154 211 181 91 75 61 108 49 60 78
1871 02 104 96 138 198 145 105 91 66 126 55 62 58
1871 03 101 109 118 199 121 127 91 110 51 59 83 69
1871 04 93 75 106 173 147 113 127 78 52 87 78 84
1871 05 92 75 106 152 133 73 165 79 34 62 102 $1
1871 06 86 73 118 123 117 93 117 96 67 103 137 60
1871 «(07 75 59 130 134 157 72 129 96 66 80 97 52
1871 08 71 64 104 150 163 55 112 81 46 115 140 37
1871 09 78 96 118 145 163 95 79 82 41 132 129 98
1871 10 94 114 99 142 162 120 75 99 55 123 112 88
1871 «11 113 95 118 154 147 130 109 81 63 153 114 115
1871 «12 113 136 97 133 145 108 96 iii 112 153 86 113
1871 «13 133 136 139 196 ll 169 73 127 105 112 115 129
1871 «14 91 166 175 181 104 133 54 148 143 85 149 128
1871 «15 77 126 186 189 109 126 55 166 133 96 103 124
1871 16 67 139 190 196 130 142 108 184 129 93 123 85
1871 «17 106 147 202 205 133 94 126 177 114 94 116 144
1871 18 113 162 199 156 163 103 133 187 114 43 129 151
1871 19 90 175 162 193 163 88 138 150 62 52 117 82
1871 20 91 166 187 181 157 72 160 147 60 72 17 91
1871 21 94 163 183 160 132 69 169 136 79 75 140 115
1871 9 22 lil 165 152 195 150 52 142 151 45 72 171 93
1871 23 97 168 143 163 156 54 99 103 54 121 133 106
1871 24 74 109 138 145 196 52 85 78 54 60 99 131
1871 25 74 106 161 130 136 29 111 94 61 94 99 120
1871 26 65 175 143 157 171 73 88 87 91 88 82 67
1871 27 55 153 131 127 156 70 85 58 81 76 82 93
1871 28 70 166 129 126 148 67 76 94 78 90 46 64
1871 «29 75 124 103 166 88 76 82 106 101 62 58
1871 30 66 143 156 120 87 82 106 78 105 79 55
1871 31 67 146 127 66 99 60 63
Mean 88.3 125.3 143.2 162.4 = 145.5 91.7 103.0 110.1 80.3 89.0 105.4 90.4



DAILY SUNSPOT NUMBERS 1928

Year Day Jan Feb Mar Apr = May = Jun Jul Aug Sep Oct. Nov Dec
1928 O01 91 89 86 96 128 124 124 102 61 68 53 46
1928 02 100 50 65 95 143 130 130 116 49 68 47 55
1928 03 75 65 49 80 125 113 128 116 85 62 49 64
1928 04 BL 41 49 108 shel id 85 107 69 47 48 95
1928 05 90 46 61 118 118 94 56 80 64 45 60 112
1928 06 105 34 2B 145 118 98 50 64 49 26 70 95
1928 07 85 35 93 118 136 104 60 7 57 64 66 94
1928 08 95 33 94 143 135 76 93 59 103 58 53 85
1928 09 8995 24 124 130 134 43 87 5 101 53 81 68
1928 10 81 31 83 112 117 30 82 80 89 7 89 83
1928 11 75 29 105 118 85 26 66 73 81 92 75 76
1928 12 79 39 102 106 75 16 122 4 89 74 84 101
1928 13 50 31 90 97 53 31 127 92 75 86 90 90
1928 14 61 29 92 96 26 34 121 92 56 83 73 95
1928 15 63 74 108 90 17 34 137 70 59 83 77 101
1928 16 83 2B 117 87 16 52 127 77 46 84 61 89
1928 17 76 5 118 63 15 67 141 58 51 77 49 56
1928 18 63 69 125 27 14 n 117 47 71 82 52 46
i928 19 72 104 141 42 15 95 126 53 83 70 58 20
1928 20 53 131 101 35 4 86 137 59 102 67 38 28
1928 21 67 113 83 31 15 94 127 7 111 5 37 25
1928 22 45 128 92 22 23 95 105 83 106 53 28 18
1928 23 64 127 66 26 40 129 71 102 108 73 33 20
1928 24 104 112 76 28 36 149 60 92 133 79 16 14
1928 25 116 109 72 43 49 163 58 104 141 53 7 8
1928 26 136 119 50 53 40 131 65 114 170 45 29 12
1928 27135 123 70 51 53 137 63 113 145 29 23 27
1928 28 96 104 61 77 102 158 67 105 115 27 28 32
1928 29 91 95 75 76 131 131 95 84 110 23 8 50
1928 30 70 62 104 158 121 102 84 113 37 28 57
1928 31 92 66 154 110 82 50 68
Mean 83.5 73.5 85.4 80.6 77.0 91.4 98.0 83.8 89.7 61.4 50.3 59.0

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
192901 77 31 44 47 65 27 71 66 9 a7 66 140
1929 02 71 37 47 51 94 30 82 70 7 53 80 125
1929 03 69 32 59 46 94 26 86 47 30 64 75 122
1929 04 71 44 66 32 74 47 59 37 27 55 92 98
1929 05 48 46 52 37 74 54 67 41 47 55 86 86
1929 06 42 47 73 63 83 60 68 56 47 64 100 91
1929 07 61 81 73 54 68 81 79 61 60 71 80 68
1929 08 78 91 88 61 79 68 73 48 §3 68 91 56
1929 09 85 117 103 65 77 58 57 56 57 76 79 57
1929 10 79 121 91 76 62 68 73 64 56 84 94 58
1929 «11 44 87 92 69 52 82 95 62 39 77 71 103
1929 (12 82 83 94 73 46 88 79 76 31 79 68 128
1929 13 82 70 77 59 76 84 86 76 $3 78 82 139
192914 96 75 66 71 71 79 76 101 25 70 96 137
192915 77 68 65 59 73 80 92 132 32 56 93 139
1929 160113 51 58 62 73 76 88 125 26 40 65 139
1929 17 30 46 40 47 53 64 70 115 38 37 67 145
1929 18 89 54 24 50 47 76 70 107 17 26 67 137
1929 19 77 32 19 58 27 70 73 110 20 18 49 139
1929 20 92 56 15 62 32 86 82 93 43 19 44 133
1929 21 77 58 11 57 30 101 100 69 55 32 44 133
1929 22 69 58 18 47 34 110 78 74 44 22 41 128
1929 23 102 57 25 48 30 104 63 67 35 33 51 126
1929 24 74 65 28 36 49 84 50 54 13 17 60 118
1929 25 69 60 22 40 61 80 40 54 10 31 81 133
1929 26 65 70 35 44 59 85 46 a7 23 36 90 107
1929 27 55 69 39 43 59 62 67 32 25 68 119 95
1929 28 20 52 18 36 59 65 58 33 17 97 127 93
1929 29 22 20 38 35 79 45 28 43 57 146 72
1929 30 29 40 53 35 84 44 28 40 76 129 65
1929 31 31 55 34 60 10 69 37
Mean 68.9 62.8 $0.2 52.8 58.2 71.9 70.2 65.8 34.4 54.0 81.1 108.0



DAILY SUNSPOT NUMBERS 1948

Year Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Mean 108.5 86.1 94.8 189.7 174.0 167.8 142.2 157.9 143.3 136.3 95.8 138.0

Year Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1949 OL 108 135 150 148 82 121 156 150 165 73 120 170
1949 02 99 149 160 155 85 125 124 156 163 115 125 158

194905 75 206 168 176 139 120 67 103 166 194 135 106
194906 87 218 172 145 141 125 79 80 172 222 125 97
1949 (07 91 220 180 147 132 100 86 58 170 190 128 124
1949 (08 94 193 172 151 118 108 61 50 160 190 135 120
194909 112 190 162 144 114 83 57 45 153 180 157 122
1949-10 118 180 152 139 103 85 52 34 160 166 128 124
1949) 11 109 186 156 104 104 102 59 7 170 183 130 137
1949 12 113 200 180 126 72 86 95 56 167 198 133 143
194913 122 222 178 130 60 119 107 82 163 182 143 148
194914 123 212 168 141 56 114 91 102 160 145 158 105
194915 118 221 172 150 69 85 113 148 162 150 128 107
1949 16 140 224 175 130 80 103 113 163 142 145 136 106
1949 17 145 218 182 160 1. 86 105 164 174 125 167 96
1949 18 157 222 196 154 111 85 109 158 205 77 172 102
194919 177 220 197 158 110 76 136 155 170 58 149 112
1949-20 169 190 210 160 105 83 144 173 164 73 134 88
194921 167 157 221 160 100 92 142 140 130 77 160 92

194925 145 137 112 177 120 116 187 148 131 95 143 140
1949-26 128 126 110 160 103 164 164 155 106 71 150 129
1949 27 90 140 114 130 114 197 182 160 88 83 170 107
1949 28 86 152 112 122 98 220 164 152 79 88 152 114
1949 29 80 90 112 119 224 185 145 50 104 188 101
1949 30 90 122 85 120 206 185 133 47 120 180 90
1949 31 ng 120 112 196 158 92 105
Mean 119.1 182.3 157.5 147.0 106.2 121.7 125.8 123.8 145.3 131.6 143.5 117.6



DAILY SUNSPOT NUMBERS 1858

Mean 83.7 87.6 90.3 85.7 91.0 87.1 95.2 106.8 105.8 114.6 97.2 81.0



UAG-73

UAG-74

UAG-75

UAG-76

UAG-77

UAG-78

UAG-79

UAG~80

UAG-81

UAG-82

UAG-83

UAG-84

UAG-85

UAG-86

UAG-87

UAG-88

UAG-89

UAG-90

UAG SERIES OF REPORTS (Continued)

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE({11-12) FOR JANUARY - JUNE 1975, by Joe Haskell
Allen, Carl C, Abston, J.E. Salazar and J.A. McKinnon, National Geophysical and Solar-Terres-
trial Data Center, NOAA, Boulder, CO, August 1979, 114 pp, $1.75 (microfiche only).

ATS-6 RADIO BEACON ELECTRON CONTENT MEASUREMENTS AT OOTACAMUND, INDIA, OCTOBER - JULY 1976,

by S.D. Bouwer, K. Davies, R.F. Donnelly, R.N. Grubb, J.£. Jones and J.H. Taylor, NOAA Space
Environment Laboratory, Boulder, CO; and R.G. Rastogi, M.R. Deshpande, H. Chandra and G. Sethia,
Physical Research Laboratory, Ahmedabad, India, March 1980, 58 pp, $2.50.

THE ALASKA IMS MERIDIAN CHAIN: MAGNETIC VARIATIONS FOR 9 MARCH - 27 APRIL 1978, by H.W. Kroehi

and G.P. Kosinski, National Geophysical and Solar-Terrestrial Data Center, Boulder, CO; S.-I.

Akasofu, G.J. Romick, C.€. Campbell and G.K. Corrick, University of Alaska, Fairbanks, AK; and

5 Hornback and A.M. Gray, NOAA Space Environment Laboratory, Boulder, CO, June 1980, 107 pp,
3.00.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(12) FOR JULY - DECEMBER 1975, by Joe Haskell Al-
len, Carl C, Abston, J.£. Salazar and J,A. McKinnon, National Geophysical and Solar-Terrestrial
Data Center, NOAA, Boulder, CO, August 1980, 116 pp, $2.50.

SYNOPTIC SOLAR MAGNETIC FIELD MAPS FOR THE INTERVAL INCLUDING CARRINGTON ROTATIONS 1601-1680,
MAY 5, 1973 - APRIL 26, 1979, by J. Harvey, B. Gillespie, P. Miedaner and C. Slaughter, Kitt
Peak National Observatory, Tucson, AZ, August 1980, 66 pp, $2.50.

THE EQUATORIAL LATITUDE OF AURORAL ACTIVITY DURING 1972-1977, by N.R. Sheeley, dr. and R.A. How-
ard, E.0. Hulbert Center for Space Research, U.S. Naval Research Laboratory, Washington, DC and
B.S. Dandekar, Air Force Geophysics Laboratory, Hanscom AFB, MA, October 1980, 61 pp, $3.00.

SOLAR OBSERVATIONS DURING SKYLAB, APRIL 1973 - FEBRUARY 1974, I. CORONAL X-RAY STRUCTURE, II.
SOLAR FLARE ACTIVITY, by J.M. Hanson, University of Michigan, Ann Arbor, MI; and E.C. Roelof and
and R.E. Gold, The Johns Hopkins University, Laurel, MD, December 1980, 43 pp, $2.50.

EXPERIMENTAL COMPREHENSIVE SOLAR FLARE INDICES FOR ‘MAJOR’ AND CERTAIN LESSER FLARES, 1975-1979,
compiled by Helen W. Dodson and E. Ruth Hedeman, The Johns Hopkins University, Laurel, MD, July
1981, 33 pp, $2.00.

EVOLUTIONARY CHARTS OF SOLAR ACTIVITY (CALCIUM PLAGES) AS FUNCTIONS OF HELIOGRAPHIC LONGITUDE
AND TIME, 1964-1979, by E. Ruth Hedeman, Helen W. Dodson and Edmond C. Roelof, The Johns Hopkins
University, Laurel, MD, August 1981, 103 pp, $4.00.

INTERNATIONAL REFERENCE IONOSPHERE - IRI 79, edited by J. Virginia Lincoln and Raymond 0. Con-
kright, National Geophysical and Solar-Terrestrial Data Center, NOAA, Boulder, CO, November
1981, 243 pp, $4.50.

SOLAR~GEOPHYSICAL ACTIVITY REPORTS FOR SEPTEMBER 7-24, 1977 AND NOVEMBER 22, 1977, Parts 1 and
2, compiled by John A. McKinnon and J. Virginia Lincoln, World Data Center A for Solar-Terres-
trial Physics, NOAA, Boulder, CO, February 1982, 553 pp, $10.00.

CATALOG OF AURORAL RADIO ABSORPTION OURING 1976-1979 AT ABISKO, SWEDEN, by J.K. Hargreaves, C.M.
Taylor and J.M. Penman, Environmental Sciences Department, University of Lancaster, Lancaster,
UK, July 1982, 69 pp, $3.00.

CATALOG OF IONOSPHERE VERTICAL SOUNDINGS DATA, edited by Raymond 0. Conkright and H. Irene Bro-
phy, National Geophysical Data Center, NOAA, Boulder, CO, July 1982, 107 pp. Supersedes UAG-54

[Superseded by UAG-92]

CHANGES IN THE GLOBAL ELECTRIC FIELDS AND CURRENTS FOR MARCH 17-19, 1978, FROM SIX IMS MERIDIAN
CHAINS OF MAGNETOMETERS, by Y. Kamide, Kyoto Sangyo University, Kyoto, Japan; H.W. Kroehl, Na-
tional Geophysical Data Center, NOAA, Boulder, CO; and A.D. Richmond, NOAA Space Environment La-
boratory, Boulder, CO, November 1982, 102 pp, $3.50.

NUMERICAL MODELING OF IONOSPHERIC PARAMETERS FROM GLOBAL IMS MAGNETOMETER DATA FOR THE CDAW-6
INTERVALS, by Y. Kamide, Kyoto Sangyo University, Kyoto, Japan; H.W. Kroehl, National Geophysi-
cal Data Center, NOAA, Boulder, CO; and B.A. Hausman, National Geophysical Data Center, NOAA,
Boulder, CO, November 1983, 197 pp, $4.00

ATMOSPHERIC HANDBOOK: ATMOSPHERIC DATA TABLES AVAILABLE ON COMPUTER TAPE, by V.E. Derr, NOAA
Environmental Research Laboratories, Boulder, CO, July 1984, 56 pp.

EXPERIENCE WITH PROPOSED IMPROVEMENTS OF THE INTERNATIONAL REFERENCE IONOSPHERE (IRI): CONTRIB-
UTED PAPERS, MAINLY FROM THE URSI-COSPAR WORKSHOP HELD IN BUDAPEST IN 1980, edited by K. Rawer,
University of Freiburg, Federal Republic of Germany, and C.M. Minnis, former Secretary General
of URSI, Brussels, Belgium, May 1984, 233 pp, $6.00.

lil



SUNSPOT NUMBERS: 1610-1985
based on

The Sunspot-Activity in the Years 1610-1960

revised by

John A. McKinnon

January 1987

WORLD DATA CENTER A for Solar-Terrestrial Physics
325 Broadway, Boulder, Colorado 80303 USA


DAILY SUNSPOT NUMBERS 1984

9

9

9

0

8
1984 «16 46 53 117 60 97 83 25 23 12 19 11 30
1984 «17 51 51 105 56 83 73 a1 18 0 24 1 24
1984-18 49 50 95 73 70 62 26 7 0 25 14 12
1984-19 $1 54 90 82 74 51 22 i 10 25 13 11
1984 20 69 54 103 69 70 53 18 16 0 W7 27 11
198421 76 76 98 68 65 43 12 12 9 19 36 14
1984 922 64 100 87 55 7 48 22 10 10 12 36 12

8

8

7

0

0

0

0

8

1985 01 0 18 13 25 19 10 21 35 7 0 0 0
1985 = 02 0 22 13 21 15 0 27 25 0 ie) 0 16
1985 03 0 25 9 23 14 ll 30 27 0 le) 0 13
1985 904 0 22 0 17 18 26 32 27 0 le) 0 ie)
1985 05 ie} 20 0 23 16 35 38 20 ie} 0 16 18
1985 06 0 16 0 19 14 37 43 14 0 le) 19 26
1985 07 0 7 0 il 32 38 71 12 0 le) 19 15
1985. 08 i 16 14 9 44 42 67 12 0 ie) 18 12
1985 09 14 24 15 9 56 42 82 7 0 0 25 16
1985 10 0 19 13 ie} 49 58 82 12 0 0 15 15
1985 11 0 13 16 0 49 66 61 12 7 0 v7 18
1985 12 13 10 18 0 33 54 45 12 0 0 19 19
1985 13 16 1 14 QO 32 45 25 0 9 ll 30 18
1985 14 26 13 10 10 32 36 9 0 9 13 44 30
1985 15 25 1 0O 0 32 37 8 i) 9 15 48 47
1985 16 26 10 lt io} 31 27 9 14 9 25 39 66
1985 17 29 12 20 0 38 23 ll 12 8 19 43 63
1985 «18 26 10 35 10 41 18 11 11 10 20 37 52
1985 19 27 19 27 9 40 10 il 12 10 31 30 40
1985 20 55 27 19 11 37 9 11 10 9 44 28 24
1985 21 59 27 9 7 36 9 10 9 8 50 18 7
1985 22 50 25 15 31 34 9 10 0 7 72 12 11
1985 23 39 16 22 28 32 12 18 QO ie) 67 10 0
1985 24 33 ll 36 30 25 13 12 te) 0 63 io} 0
1985 25 20 li 30 37 19 12 10 0 0 55 0 0
1985 26 9 11 33 37 13 10 13 8 0 40 0 0
1985 927 8 10 27 31 12 8 12 8 0 27 0 ie)
1985 28 0 9 36 27 12 8 36 10 QO 14 0 0
1985 29 9 25 26 10 51 9 7 li 0 0
1985 30 0 29 26 8 i 46 8 7 io) 0 QO

9 0

104



DAILY SUNSPOT NUMBERS 1904



DAILY SUNSPOT NUMBERS 1876

nm
WOCOROOODO

0 5

0 0

0 ie)

0 0 0
18 0 0 ie) 0
1877-06 19 10 30 0 25 26 6 0 21 te) 15 0
187707 29 13 34 9 27 19 6 0 24 0 13 it)
1877-08 35 11 19 14 18 22 5 0 23 0 0 0
1877 09 29 10 8 12 28 22 3 0 20 0 0 0
1877. 10 49 14 14 0 34 23 i) 0 24 0 0 ie}
1877) 11 44 16 8 0 32 20 3 0 31 0 0 0
187712 32 13 0 0 31 18 10 0 30 0 0 0
1877.13 42 13 0 0 36 14 0 3 29 0 7 0
1877. 14 42 13 0 0 28 9 0 0 30 0 0 0
1877. 15 47 4 0 27 18 5 0 0 24 it) v7 0
1877 16 38 13 ie) 24 20 5 0 le) 22 0 7 0
1877 17 Sl 13 0 26 29 5 18 le) ral 0 ll 0
1877 18 56 2 26 28 19 5 15 0 25 0 6 0
187719 53 0 28 18 18 11 6 Li) 28 0 io} 0
1877 20 42 0 18 34 15 11 0 0 18 0 0 0
1877) 21 39 2 20 23 15 0 0 0 10 5 Q 5
187722 18 0 14 31 28 0 0 10 le) ie) i) 5
1877.23 15 0 0 14 31 0 0 i lo) 0 15 0
1877 24 12 QO 0 38 23 20 0 18 0 0 29 0
1877) 25 0 0 0 41 20 22 0 17 9 0 20 0
1877 26 11 14 QO 35 16 13 0 18 23 14 23 2
1877 27 10 22 0 33 18 19 0 18 14 22 20 0
1877-28 15 18 0 23 4 16 ie) Vv 12 36 20 0
187729 0 0 30 5 Vv 0 Vv 9 43 25 0
1877-30 0 0 14 0 18 to) 14 5 45 15 0
187731 0 0 0 13 ml 38 5



DAILY SUNSPOT NUMBERS 1974

Year Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1974 O01 12 13 24 22 47 33 79 37 8 61 18 0
1974 02 15 10 14 20 70 41 87 23 8 53 27 ie)
1974 03 13 7 i) 19 85 52 90 12 16 46 39 9
1974 (04 12 7 10 22 98 67 93 V7 37 60 45 16
1974 05 8 te) 14 21 100 62 95 18 40 85 36 7
1974 06 0 0 19 23 102 72 93 26 44 83 25 8
1974 07 0 7 20 28 98 65 78 32 38 84 22 7
1974 08 24 15 14 38 96 59 59 34 32 97 14 0
1974 09 29 21 20 56 88 64 40 43 63 107 7 0
1974 «10 43 22 30 66 69 59 26 48 74 114 24 9
1974 «1 48 20 37 7 62 48 22 54 80 110 27 21
1974 12 54 22 38 74 49 38 22 67 80 92 24 31
1974 13 45 48 30 77 38 44 28 69 74 76 16 34

0 7

0 1

0 8

0 7

0 7

0 7

7 0
1975 08 29 29 18 V7 0 0 19 89 23 16 33 8
1975 09 37 22 20 15 0 Q 16 83 17 15 30 8
1975 10 32 18 20 7 8 0 23 80 10 8 26 0
1975 11 30 13 18 io} 0 9 29 72 10 8 30 le}
1975 12 28 18 15 0 0 QO 33 45 16 10 24 0
1975 13 32 9 15 0 0 QO 43 v4 19 21 22 0
1975 «14 13 8 17 Q 7 0 46 34 7 26 29 7
197515 20 8 24 0 7 8 43 31 8 ral 28 7
1975-16 19 8 30 id 8 19 39 26 14 18 28 7
1975 17 16 io} 28 0 0 17 25 19 4 16 30 9
1975 18 20 Q 22 0 8 12 32 16 18 16 33 8
1975 19 20 0 20 0 0 15 36 8 13 15 36 7
1975 20 23 7 14 0 0 QO 28 22 30 10 35 0
19750 21 16 8 9 0 0 7 30 23 27 7 31 0
1975 22 16 i) 0 ta) 8 0 27 7 23 0 23 0
1975 23 15 0 0 7 8 12 19 14 0 iu 12 0
1975 24 7 12 0 8 7 20 30 8 0 7 1 18
1975 25 7 9 0 7 0 24 33 11 0 ie) 9 14
1975 26 7 ta) 7 7 0 33 30 16 0 0 7 8
1975 27 ie) 0 i) 22 7 38 29 18 ie} 0 id) 0
1975 28 7 0 0 ral 13 36 26 10 0 Q 0 0
1975 29 7 0 16 i) 23 20 10 0 0 0 0
1975 30 7 0 20 0 22 27 21 7 0 0 id)
1975 31 ie) 8 8 34 21 0 0



21
21

23

©0 e000 CoO

0
0
0
0
0
0
0
0
te)
ti)

0
0
0
0
ie)
0
0
0
0
0
33
18
0
ie)

DAILY SUNSPOT NUMBERS 1824

m

mm
BO CCS GOOmMG SUSCOCCCCO

w

is
Soo

10

0
0
0
5
0
0
i}
0
0
0
0
0
0
te}
0
0
0

220 SGE00000000000 o

oo 9°

29 90 Cf

o°o00

e0000000

oo

mooco

13

NO

2 2 2 9000 uw

e





DAILY SUNSPOT NUMBERS 1982



DAILY SUNSPOT NUMBERS 1840

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1840 (Ol 116 95 71 49 34 135 90 55

1840 02 102 96 96 62 60 34 144 62 20
1840 03 112 142 82 79 47 55 115 19 81 54
1840 04 143 70 99 102 34 53 60 65
1840 05 71 131 67 86 124 41 57 101 42 76
1840 06 69 97 115 44 50 55 37 45 52
1840 07 107 84 94 49 50 82 65 20
1840 08 101 67 74 61 54 66 20 14
1840 09 110 103 89 62 74 62 7 79 27 42
1840 «10 91 109 87 67 57 79 7 35

1840 11 114 77 46 64 51 86 40

1840 «12 81 65 20 45 44 1lo 75 80 29

1840 13 79 74 91 39 86 77 a7
1840 14 92 4. 34 61 46 74 69 52
1840 «15 94 35 0 52 50 84 47 60 4g
1840 «16 116 0 74 46 80 40 74
1840 17 0 60 86 40 65 117 49 60
1840 18 80 30 55 65 97 36 56 92
1840 19 46 32 51 64 90 46

1840 20 34 31 30 62 47 80

1840 21° 27 70 37 42 34 51 69 66 74
1840 22 15 51 34 67 54 65 90

1840 23 37 29 60 65 36 47 80 50 54 50
1840 24 37 90 71 34 45 §5 51 49
1840 25 52 129 34 31 15 46 56 74 50
1840 26 57 125 39 45 14 60 37 32 80 69
1840 27 70 89 92 57 65 27 66 66
1840 28 85 86 20 64 46 45 52
1840 29 114 94 60 42 80 14 35 55
1840 30 46 62 29 14

1840 31 118 56 41 120 49

Mean 81.2 87.7 67.8 65.9 69.2 48.5 60.7 57.8 74.0 55.0 54.3 $3.7

Year Day Jan Feb Mar Apr. May dun dul Aug Sep Oct Nov Dec
1841 01 54 0 15 85 4g 32 49 29 42
1841 02 36 19 31 75 7 44 32 29 21 87
1841 03 37 15 35 71 47 45 27 76
1841 04 30 37 14 34 72 45 67 14 29 27 90
1841 05 22 0 40 80 42 64 14 14 al 81
1841 06 20 47 79 44 44 14 14

1841 (07 14 64 52 72 42 25 14 45 49 25 61
1841 08 ce) 67 50 72 53 14 27 32

1841 09 69 75 57 55 27 27 53 29

1841 +10 50 14 71 36 65 56 51 45 31 59

1841 11 27 56 42 72 56 50 56 29 62 14 32
1841-12 54 52 75 25 29 50 14 19
184i 13 55 32 50 66 27 14

1841 14 51 59 81 56 7 46 27 15 22
1841 «15 61 31 77 79 17 36 41 15 22
1841 16 61 30 67 65 15 35 57 31 14 15
1841 «17 19 30 65 0 37 51 15 14

1841 18 27 15 14 45 14 31 82 15 15
1841 «19 14 27 35 25 50 42 14 51 94 9

1841 20 i) 31 14 29 71 29 51 70 14 16 0
1841 21 0 14 14 59 29 19 44 36

1841 22 0 31 14 49 15 49 22

1841 23 i) 0 35 42 74 15 35 34 22 ia) 52
1841 24 0 24 44 41 77 55 31 20

1841 25 0 19 30 64 41 52 37 60 16 14 25
1841 26 30 34 47 56 35 50 1g 29
1841 27 19 40 49 71 46 31 47 15 14 37 29
1841 28 44 V7 45 77 59 57 0 14 32 25
1841 29 45 61 77 52 0 44 14 16
1841 30 $2 85 69 0 59 19 16

1841 31 39 15 96 16 59

Mean 24.1 29.9 29.7 40.2 67.5 55.7 30.8 39.3 36.5 28.5 19.8 38.8



DAILY SUNSPOT NUMBERS 1888

1888 02 12 q i v7
1888 03 il 18 17
1888 04 15 16 7
1888 05 12 al 13

wooocodc000w
Be

188901 0 il 1 4 0 0 3 23 14 1 0 0
1889 02 0 20 5 12 0 0 io} 23 16 1 0 0
1889 03 0 20 3 16 0 le) 0 24 15 3 0 0
1889 04 0 18 le} 12 0 QO io} 31 7 6 ie} 0
1889 05 0 18 3 13 4 to) 0 29 10 0 0 0
1889 06 0 16 13 13 13 ta) 0 26 12 i) i} i)
1889 07 0 0 12 13 14 0 0 24 12 i) 0 0
1889 08 0 0 12 13 14 0 0 23 10 0 3 0
1889 09 2 0 12 13 14 0 0 39 0 6 0 0
1889 10 0 id 12 9 10 0 te) 49 0 8 0 QO
1889 11 0 i) 16 4 0 0 0 38 0 2 0 0
1889 12 0 i} 22 4 i) 0 7 39 0 0 it 6
188913 0 0 20 4 te) 0 7 41 0 0 0 io)
188914 0 0 25 0 0 ie} 16 40 0 le) 1 0
1889 15 0 0 18 0 QO 4 19 36 0 ie) 1 te)
1889 16 15 o 17 0 i) 0 21 37 0 4 i) 0
1889 17 8 0 6 0 to) 16 19 26 0 7 0 0
1889 «18 0 le) 0 0 0 18 19 18 3 3 to) 6
1889 19 0 (o) 0 0 0 21 21 8 0 0 i) 15
1889 20 0 0 0 0 0 21 22 0 0 0 0 7
188921 0 0 0 0 0 20 17 ie) ie} le} 0 23
1889 22 0 14 0 0 0 9 12 0 0 0 it) 11
1889 23 0 17 0 0 0 ral 12 0 3 ie} 0 0
1889 24 0 26 0 0 0 20 2 0 7 3 0 4
1889 25 0 ral 0 0 0 13 3 i) 13 0 0 v7
1889 26 id) 22 te) 0 0 13 5 0 18 0 0 20
1889 27 0 25 0 0 5 13 0 0 V7 0 0 20
1889 28 0 1 to) 0 0 te} 18 16 17 0 le} 24
1889 29 0 0 0 i) 0 21 16 9 0 0 22
1889 30 0 0 io} 0 4 10 16 12 0 0 14
1889 31 ie} 0 0 28 16 0 10
Mean 0.8 8.5 6.7 4.3 2.4 6.4 9.4 20.6 6.5 2.1 0.2 6.7



UAG-55

UAG-56

UAG-57

UAG-58

UAG-59

UAG-60

UAG-61

UAG-62

UAG-63

UAG-64

UAG-65

UAG-66

UAG-67

UAG-68

UAG-69

UAG-70

UAG-71

UAG-72

UAG SERIES OF REPORTS (Continued)

EQUIVALENT IONOSPHERIC CURRENT REPRESENTATIONS BY A NEW METHOD, ILLUSTRATED FOR 8-9 NOVEMBER
1969 MAGNETIC DISTURBANCES, by Y. Kamide, Cooperative Institute for Research in Environmental
Sciences, University of Colorado, Boulder, CO; H.W. Kroeh], Data Studies Division, National Geo-
physical and Solar-Terrestrial Data Center, Boulder, CO; M. Kanamitsu, Advanced Study Program,
National Center for Atmospheric Research, Boulder, CO; Joe Haskell Allen, Data Studies Division,
National Geophysical and Solar-Terrestrial Data Center, Boulder, CO; and S.-I. Akasofu, Geophys~
ical Institute, University of Alaska, Fairbanks, AK, April 1976, 91 pp, $1.50 (microfiche only).

ISO-INTENSITY CONTOURS OF GROUND MAGNETIC H PERTURBATIONS FOR THE DECEMBER 16-18, 1971, GEOMAG-
NETIC STORM, Y. Kamide, Cooperative Institute for Research in Environmental Sciences, University
of Colorado, Boulder, CO, April 1976, 37 pp.

MANUAL ON IONOSPHERIC ABSORPTION MEASUREMENTS, edited by K. Rawer, Institut fur Physikalische
Weltraumforschung, Freiburg, GFR, June 1976, 302 pp, $4.27.

ATS6 RADIO BEACON ELECTRON CONTENT MEASUREMENTS AT BOULDER, JULY 1974 - MAY 1975, by R.B. Fritz,
NOAA Space Environment Laboratory, Boulder, CO, September 1976, 61 pp.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1974, by Joe Haskell Allen, Carl C.
Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder,
CO, December 1976, 144 pp, $2.16.

GEOMAGNETIC DATA FOR JANUARY 1976 [AE(7) INDICES AND STACKED MAGNETOGRAMS], by Joe Haskell Al-
len, Carl C. Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Cen-
ter, Boulder, CO, July 1977, 57 pp.

COLLECTED DATA REPORTS FOR STIP INTERVAL I1 20 MARCH - 5 MAY 1976, edited by Helen E. Coffey and
John A. gskianen, World Data Center A for Solar-Terrestrial Physics, Boulder, CO, August 1977,
313 pp, $2.95.

GEOMAGNETIC DATA FOR FEBRUARY 1976 [AE(7) INDICES AND STACKED MAGNETOGRAMS], by Joe Haskell Al~
Yen, Carl C. Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Cen-
ter, Boulder, CO, September 1977, 55 pp.

GEOMAGNETIC DATA FOR MARCH 1976 [AE(7) INDICES AND STACKED MAGNETOGRAMS], by Joe Haskell Allen,
Carl C. Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center,
Boulder, CO, September 1977, 57 pp.

GEOMAGNETIC DATA FOR APRIL 1976 [AE(8) INDICES AND STACKED MAGNETOGRAMS], by Joe Haskell Allen,
Carl C. Abston and Leslie D, Morris, National Geophysical and Solar-Terrestrial Data Center,
Boulder, CO, February 1978, 55 pp

THE INFORMATION EXPLOSION AND ITS CONSEQUENCES FOR DATA ACQUISITION, DOCUMENTATION, PROCESSING,
by G.K. Hartmann, Max-Planck-Institut fur Aeronomie, Lindau, GFR, May 1978, 36 pp

SYNOPTIC RADIO MAPS OF THE SUN AT 3.3 MM 1970-1973, by Earle B. Mayfield and Fred 1. Shimabuku~
ro, Aerospace Corp., £1 Segundo, CA, May 1978, 30 pp.

TONOSPHERIC D-REGION PROFILE DATA BASE, A COLLECTION OF COMPUTER-ACCESSIBLE EXPERIMENTAL PRO-
FILES OF THE D AND LOWER E REGIONS, by L.F. McNamara, Ionospheric Prediction Service, Sydney,
Australia, August 1978, 30 pp, $1.50 (microfiche only).

A COMPARATIVE STUDY OF METHODS OF ELECTRON DENSITY PROFILE ANALYSIS, by L.F. McNamara, Iono-
spheric Prediction Service, Sydney, Australia, August 1978, 30 pp, $1.50 (microfiche only).

SELECTED DISTURBED D-REGION ELECTRON DENSITY PROFILES. THEIR RELATION TO THE UNDISTURBED D RE-
GION, by L.F. McNamara, Ionospheric Prediction Service, Sydney, Australia, October 1978, 50 pp,
$1.50 (microfice only).

ANNOTATED ATLAS OF H-ALPHA SYNOPTIC CHARTS FOR SOLAR CYCLE 20 (1964-1974) CARRINGTON SOLAR RO-
TATIONS 1487-1616, by Patrick S$. McIntosh, NOAA Space Environment Laboratory, Boulder, CO, Feb-
ruary 1979, 327 pp, $3.50.

MAGNETIC POTENTIAL PLOTS OVER THE NORTHERN HEMISPHERE FOR 26-28 MARCH 1976, A.D. Richmond, NOAA
Space Environment Laboratory, Boulder, CO; H.W. Kroehl, National Geophysical and Solar-Terres-
trial Data Center, Boulder, CO; M.A. Henning, Lockheed Missiles and Space Co., Aurora, CO; and
Y. Kamide, Kyoto Sangyo University, Kyoto, Japan, April 1979, 118 pp, $1.50.

ENERGY RELEASE IN SOLAR FLARES, PROCEEDINGS OF THE WORKSHOP ON ENERGY RELEASE IN FLARES, 26 FEB-
RUARY - 1 MARCH 1979, CAMBRIDGE, MASSACHUSETTS, U.S.A., edited by David M. Rust, American Sci-
ence and Engineering, Inc., Cambridge, MA, and A, Gordon Emslie, Harvard-Smithsonian Center for
Astrophysics, Cambridge, MA, July 1979, 68 pp, $1.50 (microfiche only).

110



DAILY SUNSPOT NUMBERS 1924

Year Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1924 (OL 0 ie) 15 0 0 29 26 25 42 27 11 0
1924 02 0 0 ll io) QO 46 34 30 37 45 7 0
1924 03 0 0 7 it) i) 47 32 38 59 36 0 13
1924 604 8 0 7 0 0 44 31 31 37 42 0 0
1924 05 7 0 0 0 0 48 35 29 40 38 0 is)
1924 06 0 te) 0 1 7 62 36 28 30 36 ie) ie)

0 0 0 0 0 8

0 te) 0 0 0 8

0 0 0 0 0

0 0 0 0

0 0 id 0

0 0 0 it}

0 0 0 0

0 3 0 8

0 2 0 0

0 0 0 0

ie) 0 0 9

ie) 0 QO

i} 0 i

0 0 0

0 0 0

0 0 8

0 0 8

0 0 0

0 0

te) 0

to) 0

0 ie)

i) it)

0 0

0 0

74



DAILY SUNSPOT NUMBERS 1828

1829 18 46 70 45 59 74 100 81 $1 33 101

1829 «19 30 61 70 45 94 57 82
1829 20 34 30 51 80 44 78 97 110 82

1829 21 32 16 32 135 31 76 79 102 79 71

1829 22 32 47 65 124 29 94 102 79 76 29 66
1829-23 31 54 87 45 100 74 72 42
1829 24 29 36 50 31 107 72 95 61 74 34
182925 56 79 86 41 115 71 110 57 56 55 14
1829 26 44 45 69 97 47 116 61 112 61 45 14
1829 27 29 61 134 49 101 45 117 61 59

1829 28 57 64 91 125 61 111 74 88 57 32 56
1829 29 7 77 90 80 231 76 84 74 34
1829 30 112 126 80 90 109 75 64 60

1829 31 136 52 62

Mean 43.0 49.4 72.3 95.0 67.4 73.9 90.8 77.6 52.8 57.2 67.6 56.5



DAILY SUNSPOT NUMBERS 1960

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec

92



280

240

2004

160-4

120-4

q
80

40

1700 1710 1720 1730 1740 1750 1760 1770 1780

1790 1800

280

240

200

160

120

1800 20 1830 1840 1850 1860 1870 18

1890 1900

200

160

1204

80

40

1900 ©1910 1920 1930 1940 1950 1960 1970 1980

1990 §2000

YEARLY MEAN SUNSPOT NUMBERS 1700 - 1985. Sunspot counts rise and fall approximately every 11.1 years.
The cycle, though, is not symmetrical, for the spot count takes on the average about 4.8 years to rise
from a minimum to a maximum and another 6.2 years to fall to a minimum once again. The largest annual

mean number (190.2) occurred in 1957.

Graph: Daniel C. Wilkinson

a



DAILY SUNSPOT NUMBERS 1926

Year Day dan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1926 O01 93 40 50 35 62 62 104 76 45 29 51 115
1926 02 71 42 68 30 53 73 76 62 2i 23 65 85
1926 03 58 38 103 29 56 47 79 89 28 37 59 57
1926 04 37 41 103 29 68 98 64 101 21 34 73 $5
1926 605 34 34 119 22 86 80 43 82 39 37 58 89
1926 06 56 29 97 23 53 83 46 79 42 $3 44 68
1926 07 50 35 100 30 74 95 35 40 43 69 27 70
1926 08 76 44 103 27 102 86 34 50 29 116 31 65
1926 09 90 32 82 50 92 92 24 67 28 70 35 38
1926 610 92 42 63 30 88 g1 7 62 35 85 50 69
1926 11 84 99 47 34 93 94 28 59 30 144 38 90
1926 12 69 94 61 37 89 62 16 70 33 132 39 92
1926 13 57 142 45 58 83 75 7 75 37 151 39 116
1926 14 55 150 60 71 60 80 11 55 55 133 37 80
1926 «15 61 162 89 65 86 57 13 47 74 110 38 106
1926 16 78 142 110 69 84 65 8 45 73 113 39 96
1926 17 94 127 79 69 65 50 0 40 89 83 37 93
1926 618 76 85 72 63 71 55 0 40 112 60 26 94
1926 619 95 99 69 75 80 50 14 $1 111 55 20 86
1926 20 82 67 46 58 63 52 22 53 106 31 53 75
1926 21 103 59 38 41 75 44 4 74 105 50 101 87
1926 22 95 41 1i 35 67 39 52 58 89 40 112 103
1926 23 102 48 42 4 40 $5 55 64 85 40 113 68
1926 24 87 49 35 4 27 $8 99 78 68 37 101 106
1926 25 124 61 37 16 31 56 72 73 70 62 106 95
1926 26 71 56 45 18 22 90 125 62 70 93 110 91
1926 27 78 53 47 15 23 92 114 55 101 85 88 52
1926 28 38 45 18 19 43 103 115 55 80 95 89 82
1926 29 61 30 41 54 ill 103 55 $7 49 64 61
1926 30 48 31 39 52 109 98 ag 49 61 73 29
1926 31 al 38 50 100 43 40 49
Mean 71.8 69.9 62.5 38.5 64.3 73.5 52.3 61.6 60.8 71.5 60.5 79.4

Year Day dan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1927, O01 67 122 41 7 48 32 98 49 61 43 65 35
1927 02 67 136 46 81 53 42 120 59 61 32 56 26
1927 03 65 157 46 89 68 41 101 35 62 $1 32 30
1927 04 81 155 67 77 73 42 M1 50 37 65 25 7
1927, 05 89 173 59 102 99 $1 97 51 50 82 45 34
1927 06 76 119 58 98 105 63 72 48 44 82 36 64
1927 07 111 163 71 98 97 79 61 37 47 85 33 58
1927 08 105 116 88 80 78 79 45 7 40 90 15 72
1927 09 123 127 91 136 91 57 54 18 44 95 46 88
1927 10 116 124 46 101 110 54 52 19 47 115 71 85
1927) li 124 106 55 163 101 63 42 32 68 112 91 85
1927 12 79 82 50 137 143 72 16 31 92 74 101 53
1927, 13 §3 58 74 125 97 73 14 53 96 90 113 62
1927, 14 70 98 70 138 $7 54 32 59 103 79 100 47
192715 68 71 105 131 59 32 32 70 154 76 91 20
1927 16 76 58 95 157 67 22 44 68 126 54 84 19
1927) 17 88 79 125 124 86 51 47 80 111 44 87 v7
1927 18 1li 76 126 120 98 37 45 97 85 32 81 10
1927 19 89 65 147 91 67 35 22 79 81 53 64 8
1927 20 76 67 114 66 72 26 34 58 81 40 79 11
1927. 21 70 46 131 59 81 32 43 49 55 66 78 17
1927 22 80 52 121 68 87 43 49 61 44 66 70 14
1927 23 65 53 82 62 88 45 49 68 73 56 81 32
1927 24 85 45 56 49 101 64 52 68 86 65 88 59
1927 25 44 54 49 51 90 73 68 56 85 69 87 63
1927 26 42 59 23 90 86 88 68 $6 $8 46 70 33
1927 27 38 79 38 93 88 80 75 58 77 25 67 56
1927 28 49 64 16 40 43 116 34 52 38 25 45 64
1927 29 64 31 55 58 114 44 68 27 29 59 70
1927 30 109 16 48 34 113 39 66 30 40 57 73
1927) 31 149 21 28 43 56 75 79
Mean 81.6 93.0 69.6 93.5 79.1 59.1 54.9 53.8 68.4 63.1 67.2 45.2



DAILY SUNSPOT NUMBERS 1938

1938
1938
1938
1938
1938

dan Feb Mar Apr. May dun dul Aug Sep
117 62 74 83 115 113 119 144 106
109 73 67 81 134 100 116 121 124
86 68 62 80 160 107 157 121 101
76 94 45 80 137 103 181 153 107
80 85 43 91 123 91 141 132 120
101 128 52 95 138 86 184 133 136
102 124 78 95 136 134 175 135 100
86 110 71 85 153 139 186 150 88
59 101 97 87 156 115 175 158 74
92 133 106 103 151 115 183 161 78
98 137 134 110 149 106 205 173 67
104 161 124 97 143 99 2il 132 59
106 169 161 119 151 91 229 124 44
111 200 149 115 135 88 208 107 48
118 171 145 117 131 87 200 102 44
134 205 161 133 105 76 173 119 47
110 171 140 107 91 76 161 106 46
110 174 105 112 87 56 148 100 65
104 145 80 100 95 69 151 104 55
119 98 77 99 116 76 153 76 S7
123 109 86 89 106 103 147 65 56
122 91 64 75 124 101 118 72 70
149 90 71 82 119 98 157 94 86
108 92 66 95 172 88 189 86 97
94 83 59 92 161 76 202 113 131
76 81 34 92 152 72 179 103 150
67 97 52 124 126 108 156 91 143
76 85 $5 144 99 106 151 94 137
59 65 144 104 128 151 114 125
79 73 105 89 119 139 105 131
76 86 91 109 98

al 79 102 34 163 129 103 67 103
42 90 92 85 157 120 97 78 116
60 97 70 83 119 113 112 73 124
76 67 75 82 141 97 128 94 119
58 56 60 74 124 104 130 90 136
90 82 52 70 115 124 122 112 136
68 76 52 63 133 127 151 106 114
78 85 44 86 105 113 167 141 145
55 64 61 89 103 116 130 157 159
134 44 47 98 128 104 143 151 168
118 49 49 102 101 119 131 157 136
ili 73 55 100 142 102 118 170 150
103 86 55 112 121 107 101 189 127
84 76 46 126 148 112 97 138 92
86 56 58 121 139 101 87 146 96
55 62 55 141 118 97 74 122 83
71 62 83 109 93 92 85 128 69
63 61 112 102 79 91 86 111 67
70 62 133 94 79 89 95 110 88
74 82 112 125 68 56 113 104 70
86 92 89 125 87 68 106 94 89
83 96 77 115 85 68 96 86 88
77 98 74 152 93 65 80 72 88
30 93 66 151 106 74 67 75 107
102 112 48 134 107 61 62 58 106
86 74 49 134 97 84 53 69 98
102 101 41 146 104 109 50 86 105
103 92 35 145 138 137 57 85 131
72 41 136 172 134 71 69 131
76 36 140 157 118 68 76 137
76 35 146 46 95



MAINTAINING SUBJECTIVE STANDARDS

Two policies have helped reduce the influence of personal judgment on the esti-
mates of sunspot counts:

(1) the appointment of a permanent arbiter to oversee computation of all
final counts and

(2) the reliance on a few principal reporting stations manned by trained
and dedicated observers.

To cover gaps in observations owing to overcast skies at Zurich, Wolf sought col-
laborators at places as distant as possible from each other--collaborators who would
carry out their daily counts of sunspots under his strict guidance. Wolf eventually
established an international network of observatories, which since the middle of the
19th Century, has grown to about 30 cooperating stations and to about an equal num-
ber of cooperating amateurs.

Anes

Two pages from Rudolph Wolf's 1841 diary of astronomical observations.

Institut fur Astronomie, EIDGENOSSISCHE TECHNISCHE HOCHSCHULE-Zentrum, Zurich.

HISTORICAL MEASUREMENTS

Wolf searched the literature and observatory archives for numerical measures of
sunspot activity during times before 1848. He did locate many descriptions and
drawings of the sun and from them reconstructed an almost complete series of daily
numbers back to 1818, of monthly means back to 1749, and of annual means back to
1700. He even traced the activity to 1610, the year Galileo Galilei first observed
sunspots through a small telescope. With these early data Wolf confirmed the exist-
ence of a cycle in sunspot numbers, and he more accurately determined that cycle's
average length to be 11.1 years.

Not suprisingly, historical sunspot data proved less reliable than the controlled
counts made in 1848 and thereafter. Many observations, for example, displayed a
seasonal variation--a fluctuation in the count owing to the weather, not to the sun.



UAG-37

UAG-38

UAG-39

UAG-40

“UAG-41

UAG-42

UAG-43

UAG-44

UAG-45

UAG-46

UAG-47

UAG-48

UAG~48A

UAG-49

UAG-50

UAG-51

UAG-52

UAG-53

UAG~54

UAG SERIES OF REPORTS (Continued)

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(10) FOR 1966, by Joe Haskell Allen, Carl C.
Abston and Lestie OD. Morris, National Geophysical and Solar~Terrestrial Data Center, Boulder,
CO, December 1974, 142 pp.

MASTER STATION LIST FOR SOLAR-TERRESTRIAL PHYSICS DATA AT WOC-A FOR SOLAR-TERRESTRIAL PHYSICS,
by R.W. Buhmann, World Data Center A for Solar-Terrestrial Physics, Boulder, CO; Juan D. Roe-
derer, University of Denver, Denver, CO; and M.A. Shea and D.F. Smart, Air Force Cambridge Re-
search Laboratories, Hanscom AFB, MA, December 1974, 110 pp, $1.60.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1971, by Joe Haskell Allen, Carl C.
Abston and Leslie 0. Morris, National Geophysical and Solar- Terrestrial Data Center, Boulder,
CO, February 1975, 144 pp, $2.05.

H-ALPHA SYNOPTIC CHARTS OF SOLAR ACTIVITY FOR THE PERIOD OF SKYLAB OBSERVATIONS, MAY 1973 -
MARCH 1974, by Patrick S. McIntosh, NOAA Space Environment Laboratory, Boulder, CO, February
1975, 32 pp.

H-ALPHA SYNOPTIC CHARTS OF SOLAR ACTIVITY DURING THE FIRST YEAR OF SOLAR CYCLE 20 OCTOBER 1964 -
AUGUST 1965, by Patrick $. McIntosh, NOAA Space Environment Laboratory, Boulder, CO, and Jerome
T. Nolte, American Science and Engineering, Inc., Cambridge, MA, March 1975, 25 pp

OBSERVATIONS OF JUPITER'S SPORADIC RADIO EMISSION IN THE RANGE 7.6-80 MHZ, 10 DECEMBER 1971
THROUGH 21 MARCH 1975, by James W. Warwick, George A. Dulk and Anthony C. Riddle, University of
Colorado, Boulder, CO, April 1975, 49 pp

CATALOG OF OBSERVATION TIMES OF GROUND-BASED SKYLAB-COORDINATED SOLAR OBSERVING PROGRAMS, com-
piled by Helen E. Coffey, World Data Center A for Solar-Terrestrial Physics, NOAA, Boulder, co,
May 1975, 159 pp, $3.00.

SYNOPTIC MAPS OF SOLAR 9.1 CM MICROWAVE EMISSION FROM JUNE 1962 TO AUGUST 1973, by Werner Graf
and Ronald N. Bracewell, Stanford University, Stanford, CA, May 1975, 183 pp, $2.55.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1972, by Joe Haskell Allen, Carl C.
Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder,
CO, May 1975, 144 pp, $1.50 (microfiche only).

INTERPLANETARY MAGNETIC FIELD DATA 1963-1964, by Joseph H. King, National Space Science Data
Center, NASA Goddard Space Flight Center, Greenbelt, MD, June 1975, 382 pp, $2.95.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1973, by Joe Haskell Allen, Carl C.
Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder,
CO, June 1975, 144 pp, $1. 50 (microfiche only).

[Superseded by UAG-48A]

SYNOPTIC OBSERVATIONS OF THE SOLAR CORONA OURING CARRINGTON ROTATIONS 1580-1596 (11 OCTOBER 1971
> 15 JANUARY 1973), [Re-issue of UAG-48 with quaiity images], by R.A. Howard, M.J. Koomen, D.J.
Michels, R. Tousey, C.R. Detwiler, D.E. Roberts, R.T. Seal, and J.D. Whitney, U.S. Naval Re-
search Laboratory, Washington, DC; and R.T. Hansen and S.F. Hansen, C.J. Garcia and E. Yasukawa,
High Altitude Observatory, NCAR, Boulder, CO, February 1976, 200 pp, $4.27. Supersedes UAG-48.

{Superseded by UAG-92]

HIGH-LATITUDE SUPPLEMENT TO THE URSI HANDBOOK ON IONOGRAM INTERPRETATION AND REDUCTION, edited
by W.R. he ea British Antarctic Survey, c/o Appleton Laboratory, Slough, UX, October 1975,
294 pp,

SYNOPTIC MAPS OF SOLAR CORONAL HOLE BOUNDARIES DERIVED FROM HE II 304A SPECTROHELIOGRAMS FROM
THE MANNED SKYLAB MISSIONS, by J.D. Bohlin and D.M. Rubenstein, U.S. Naval Research Laboratory,
Washington, DC, November 1975, 30 pp.

EXPERIMENTAL COMPREHENSIVE SOLAR FLARE INDICES FOR CERTAIN FLARES, 1970-1974, by Helen W. Dodson
and E. Ruth Hedeman, McMath-Hulbert Observatory, University of Michigan, Pontiac, MI, November
1975, 27 pp.

DESCRIPTION AND CATALOG OF IONOSPHERIC F-REGION DATA, JICAMARCA RADIO OBSERVATORY (NOVEMBER 1966
- APRIL 1969), by W.L. Clark and T.£. Van Zandt, NOAA Aeronomy Laboratory, Boulder, CO, and J.P.
McClure, University of Texas at Dallas, Dallas, TX, April 1976, 10 pp.

{Superseded by UAG-85]

109



DAILY SUNSPOT NUMBERS 1934

Year Day Jan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1934 (01 0 iL i) 0 7 0 0 QO 0 15 13 27
1934 02 0 9 0 11 0 9 0 i} 0 0 14 20
1934 03 0 9 0 12 0 i) 0 ie) 7 ie) 16 12
1934 04 0 0 6 9 14 0 0 0 0 8 14 14
1934 05 i} 10 i} 8 7 0 0 0 0 0 12 14
1934 06 0 11 7 0 21 0 8 8 0 it} 14 10
1934 07 ie) 19 9 Q 26 0 8 9 0 0 10 13
1934 08 i?) 8 19 0 34 0 ll 9 0 i} 8 11
1934 09 0 14 22 0 23 7 ll 10 ie] 0 10 0
1934-10 0 8 12 i) 19 0 18 ll 7 0 7 0
1934 11 0 9 15 ie) 10 i) 24 12 it) 7 7 0
1934 12 8 9 7 0 7 i) 24 21 7 8 7 0
1934 13 lL 16 0 0 15 0 25 22 7 8 0 0
1934 14 12 7 0 7 21 0 24 24 8 8 ie) it)
193415 13 10 lo} 2 26 lL 20 24 16 9 0 0
1934 16 16 ii 0 33 25 27 23 27 9 9 0 ie)
1934 17 11 11 0 32 35 31 Vv V7 8 8 ie) ie)
1934 (18 4 11 7 29 41 26 18 22 0 8 7 i}
1934 19 0 8 it} 22 46 25 17 13 0 14 i) it)
1934 20 0 0 0 21 37 14 9 0 0 i) 0 14
1934 21 0 0 0 22 29 16 8 0 0 ie) 0 24
1934 22 le} 0 0 18 34 10 0 0 0 7 O 21
1934 23 0 ie) 0 16 33 10 0O 7 7 8 0 27
1934 24 0 10 0 19 23 8 8 8 0 i) ie) 25
1934 25 0 7 7 li 19 8 8 0 0 7 7 47
1934 26 0 to) 7 10 v7 8 0 0 0 7 11 37
1934 27 te} 0 ie) 16 9 0 i} 7 QO 7 14 29
1934 28 ia) ti) i) 14 16 Q 6 ie) 9 7 23 35
1934 929 8 7 7 8 0 0 0 14 9 35 31
1934 30 li 7 0 to) 0 0 7 21 16 31 36
1934 31 12 0 0 0 0 8 31
Mean 3.4 7.8 4.3 11.3 19.7 6.7 9.3 8.3 4.0 5.7 8.7 15.4
DAILY SUNSPOT NUMBERS 1935
Year Day dan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1935 (01 34 10 19 0 7 34 41 10 30 71 22 50
1935 02 27 10 16 0 26 39 29 11 36 73 7 57
1935 03 27 9 19 0 46 34 29 22 37 68 42 64
1935 04 22 9 12 7 56 34 24 24 46 52 46 65
1935 (05 7 10 18 0 56 31 28 18 47 61 46 53
1935 06 al 29 15 0 56 41 29 28 46 57 41 67
1935 07 19 48 8 ie) 56 25 22 43 47 53 59 77
1935 08 12 30 8 il 62 46 50 49 a7 40 59 79
1935 09 il 24 7 21 54 59 43 26 53 12 67 85
1935 10 9 28 27 22 4 73 38 33 32 7 61 65
1935 li li 22 34 16 46 74 43 29 23 25 68 77
1935 12 24 26 44 22 41 66 $8 38 22 37 68 85
1935-13 24 18 56 34 41 55 62 37 33 65 97 63
1935 14 28 27 72 30 49 41 51 34 29 58 98 59
1935 15 16 22 68 37 32 4g 48 29 26 69 111 67
1935 16 16 20 50 22 27 42 49 26 33 68 104 59
193517 14 10 43 18 8 38 a7 20 34 95 102 58
1935 18 13 7 33 20 i} 43 46 29 33 84 94 48
1935 19 10 19 40 ll 0 38 51 23 31 79 91 27
1935 20 9 28 34 16 0 67 60 52 20 64 70 27
193521 7 21 24 15 0 50 36 55 18 76 71 44
1935 22 14 29 Vv 16 0 35 32 40 al 67 52 41
1935 23 16 17 12 9 0 29 30 34 45 63 62 47
1935 24 31 17 8 7 v7 38 29 35 56 63 45 53
1935 25 32 25 7 7 7 44 23 32 59 65 44 79
1935 26 31 18 8 0 8 $1 19 29 69 59 56 62
1935 27 26 20 7 ie) 8 56 11 13 80 40 58 79
1935 28 26 20 0 ie) 8 52 8 26 71 28 58 63
1935 29 11 0 8 7 45 0 28 78 24 64 61
1935 = 30 9 0 16 30 42 8 24 61 13 53 70
1935 31 1 0 38 8 37 13 75
Mean 18.6 20.5 23.1 12.2 27.3 45.7 33.9 30.1 42.1 53.2 64.2 61.5



i=)

a ep

mse
1800 1810 1820 1830 1840 1850 1860 1870
360

320 :

280-
2404
200-4

160+

1204
80-4

404

a 0
oe a a a
1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

DAILY SUNSPOT NUMBERS January 8, 1818 - December 31, 1985. Although the smallest division marked along
the horizontal axis is 1 year, all daily values for a year have been plotted within each small line seg-
ment. Here, as before, the vertical axis gives the value of the sunspot number. A striking day-by-day
variability clearly shows. The gap in the numbers between O and 11 illustrates how insensitive sunspot
counts are to periods of low solar activity, because the appearance of a single, isolated spot causes the
number to jump from 0 to 11; only by averaging reports from several observatories do values less than 11
emerge. Today, more sophisticated observations of the sun's atmosphere have demonstrated that large gra-
dations of activity can exist even in the absence of visible spots. Note, too, the density pulsations in
points along the graph's vertical dimension; they reflect the strong contribution to the sunspot number
that the factor 10 makes in the definition of the count. On December 24 and 25, 1957, the largest daily
number on record occurred. For each of those days the sunspot number totaled 355.

Toor AAASRRRRAS BA

Graph: Daniel C. Wilkinson
105



DAILY SUNSPOT NUMBERS 1956

1956 26 69 140 140 91 120 70 100 178 136 152 160 229
1956 27 44 125 115 g1 115 71 116 203 131 140 125 215
1956 28 48 132 117 67 137 122 104 196 127 150 135 202
1956 29 53 132 122 40 136 135 108 200 143 168 154 187
1956 30 48 116 70 146 162 130 212 158 178 198 171
1956 31 46 113 123 140 182 167 177



DAILY SUNSPOT NUMBERS 1892



DAILY SUNSPOT NUMBERS 1884

Year Day dan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1884 01 90 85 92 77 59 76 70 77 52 59 55 54
1884 902 90 86 92 B2 51 72 91 85 35 62 44 50
1884 03 90 73 103 85 30 56 95 97 7 54 20 45
1884 04 93 93 103 92 52 47 105 82 19 77 18 40
1884 905 96 95 93 79 29 65 98 62 13 56 13 36
1884 «06 99 91 88 99 28 69 73 36 33 64 11 47
1884 07 129 88 119 68 43 51 58 33 47 27 il 44
1884 08 110 74 107 78 40 77 62 37 48 35 5 32
1884 09 150 70 108 76 74 61 56 47 55 27 19 48
1884 10 = 166 67 112 78 82 45 36 46 69 34 28 St
188411 116 83 104 72 81 31 35 45 59 35 51 43
1884-12 112 64 98 75 72 36 56 4s 74 30 47 51
188413 110 75 113 72 73 34 59 45 69 26 54 48
188414 87 104 138 49 68 44 49 51 68 26 68 61
1884 «15 63 88 132 52 57 42 36 38 70 24 50 42
1884 16 67 85 111 51 $5 32 27 34 7 18 38 38
1884 «17 76 88 99 73 54 43 24 35 82 20 49 55
1884 = 18 85 108 99 56 62 57 26 33 80 33 24 $7
1884 «19 89 103 109 73 70 58 27 $1 86 33 38 54
1884 20 62 84 100 88 65 53 33 33 82 35 29 $2
188421 74 66 85 63 60 66 35 75 90 55 47 74
1884 922 71 56 85 89 54 57 44 78 90 39 43 54
1884 923 67 61 60 108 90 4g 52 78 98 $5 57 60
1884 9624 79 108 54 103 87 42 54 64 69 72 31 55
1884 25 79 108 47 78 105 35 49 79 60 76 38 62
1884 9626 68 117 45 76 91 40 38 76 55 69 40 24
1884 27 59 122 41 72 102 54 37 39 63 80 36 39
1884 28 79 99 33 78 95 44 54 72 62 74 41 36
1884 929 93 78 44 71 78 49 48 50 74 77 36 36
1884 30 88 42 70 88 SL 57 52 61 56 57 39
188431 101 56 67 62 55 54 35
Mean 91.5 86.9 87.5 76.1 66.5 51.2 53.1 55.8 61.9 47.8 36.6 47.2

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1885 Ol 22 60 60 41 69 74 85 43 63 47 42 i}
1885 02 34 45 84 59 81 75 91 36 66 53 28 6
1885 03 50 57 92 57 54 85 84 27 75 42 33 4
1885 904 $3 75 97 51 63 93 75 24 61 45 23 3
1885 0S 42 84 99 §3 68 86 76 35 62 36 21 0
1885 06 48 74 93 $9 72 78 73 42 52 39 26 0
1885 07 40 84 100 66 98 84 62 60 40 43 36 i)
1885 08 10 106 67 72 108 81 59 60 42 51 30 9
1885 09 6 90 53 75 109 68 72 88 39 35 46 8
1885 10 3 62 54 81 87 62 52 82 31 34 55 ie)
1885 il 0 78 44 76 73 59 63 75 18 35 47 19
1885 12 9 60 46 77 68 75 62 70 25 25 35 18
1885 913 10 83 53 57 54 70 $9 73 23 7 38 22
1885 14 v7 75 52 53 33 71 68 63 31 0 43 17
1885 15 33 91 46 43 25 89 91 59 22 0 52 13
1885 16 24 75 45 30 34 107 72 60 19 0 54 20
1885 «17 20 89 43 28 36 117 71 35 29 8 $7 18
1885 18 40 93 28 27 46 114 88 34 30 25 $5 23
1885 19 47 100 29 21 50 94 7 $1 24 40 60 33
1885 20 61 92 26 34 67 96 67 51 12 34 44 37
1885 21 70 90 18 42 88 77 67 7 1 41 24 54
1885 22 85 90 5 65 80 73 65 16 39 35 20 25
1885 23 77 64 0 55 81 104 56 33 32 $5 16 36
1885 24 74 49 13 56 107 100 72 37 35 35 12 33
1885 25 68 45 29 43 115 79 52 39 37 75 ie} 35
1885 26 34 35 38 35 90 71 53 31 51 63 7 34
1885 27 79 29 44 45 101 70 4 54 69 57 0 43
1885 28 76 36 38 90 84 64 67 69 55 72 18 $1
1885 29 75 49 87 80 83 54 72 $3 52 6 42
1885 30 68 53 73 77 112 39 57 42 60 0 36
1885 31 52 45 65 38 58 56 35
Mean 42.8 71.8 49.8 55.0 73.0 83.7 66.5 50.0 39.6 38.7 30.9 21.7



SMOOTHED MONTHLY MEAN SUNSPOT NUMBERS (Continued)

Dec

Nov

Jul

dun

Feb Mar Apr

dan

Year

aro
Noo

200
Noo

@moo
aad

NAO
O40

aAwo
OAS

tNO
aN

woo
nono

200
oro

wwo
ero

mmo
ond

THO
oso

OaAdan
HnSse
onadea
RonnS
SROGR

16.8 15.0 9.9 8.7 7.8 6.7

17.9

N
&

1866

16


DAILY SUNSPOT NUMBERS 1866

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1866 1 31 19 21 9 0 23 31 0 10 22 13 10
1866 02 42 14 11 11 ie) 15 25 ie) 10 12 15 le}
1866 03 29 16 10 13 0 16 22 id) 10 13 12 0
1866 04 35 26 21 13 il 12 22 ie) 10 10 0 0
1866 05 41 34 9 14 ie) 18 13 14 0 13 0 0
1866 06 40 41 9 19 0 15 ll 16 0 i 0 0
1866 07 32 31 1 23 te) 19 10 27 0 1. 0 Q
1866 08 16 27 11 22 12 7 10 30 0 0 0 0
1866 09 10 15 9 24 18 14 10 14 0 0 0 it)
1866 «10 13 25 15 35 18 18 0 18 0 0 Q it)
1866 «11 16 48 27 36 27 eal 10 13 0 ie) 0 0
1866 «12 21 58 33 34 22 10 11 10 0 0 0 0
1866 «13 22 54 33 24 22 0 10 10 0 10 0 0
1866 «14 15 45 37 24 22 Q ae 10 0 16 0 0
1866 «15 a7 4g 45 12 20 0 10 0 0 9 0 0
1866 16 33 55 22 14 22 22 10 22 0 10 0 0
1866 «17 43 58 yaa 16 25 18 11 18 i) 31 i) 0
1866 18 49 53 22 15 13 16 10 al 10 30 0 0
1866 19 49 103 21 14 11 16 10 19 10 21 19 0
1866 20 51 118 21 14 22 13 10 16 10 32 19 lo}
1866 21 34 31 31 10 22 13 10 13 10 31 20 0
1866 = 22 29 57 28 10 10 22 10 13 10 30 32 0
1866 23 34 22 26 15 10 30 10 20 10 14 32 0
1866 24 36 14 57 18 10 31 0 21 10 14 32 it)
1866 25 42 i) 35 20 10 15 0 10 10 9 7 11
1866 26 38 13 42 25 il 12 0 10 16 16 19 12
1866 27 22 14 36 23 10 10 0 10 10 10 11 0
1866 28 23 35 39 21 11 23 0 10 al 9 11 14
1866 29 27 36 ie) 10 38 0 10 29 23 10 0
1866 30 30 12 0 1 29 0 10 24 16 9 ie)
1866 31 29 10 21 0 10 13 ie)
Mean 31.6 38.4 24.6 17.6 12.9 16.5 9.3 12.7 7.3 14.1 9.0 1.5

Year Day dan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1867 01 ie) ie) 0 12 0 10 16 0 ty) 16 0 32
1867 02 ie) ie) 0 Q 0 10 16 0 0 10 0 31
1867 03 ie) ie) il 13 Q 10 14 0 0 19 10 54
1867 04 0 iv} 10 21 iv 14 14 0 0 15 16 29
1867 05 ti) 10 15 26 0 0 10 iv) 0 35 16 22
1867 06 0 ie) 10 7 0 0 14 0 0 54 10 16
1867 07 0 i) 0 45 id) 0 QO 0 0 38 10 16
1867 08 0 0 i} 16 ie) 0 0 ie} 0 32 10 16
1867 09 0 it) 0 13 ie) 0 0 0 19 37 10 10
1867. 10 0 0 0 10 9 0 0 0 20 31 10 10
1867. 11 0 0 0 0 i) 0 0 0 15 33 10 14
1867. 12 0 0 0 0 it) 0 i) 0 17 17 10 0
1867-13 0 0 te} 0 it) 0 10 0 22 15 16 0
1867 14 0 0 0 0 0 0 10 0 34 11 10 0
1867 15 0 0 12 0 ot) 0 10 10 31 10 10 0
1867 16 0 9 16 0 0 0 10 15 25 18 16 0
1867 17 le} 0 16 ie} 0 io} 10 10 25 10 0 0
1867 18 0 le) 16 0 0 0 10 19 31 16 0 0
1867 19 0 i) 25 10 ie) 0 10 11 19 0 0 19
1867 20 0 10 16 0 0 0 0 11 16 0 0 16
1867 21 0 0 21 0 ie) 0 0 10 10 i) 0 14
1867 22 0 0 17 id) to) 0 0 22 0 0 0 39
186723 0 0 22 0 to) 0 0 13 0 0 0 79
186724 0 0 17 0 0 0 0 15 0 0 10 52
1867 25 i} 0 15 0 13 0 0 12 i) 0 10 61
1867 26 0 0 12 Q oa QO 0 0 0 0 10 e7
1867 27 0 0 10 0 19 0 0 le) ie) 0 16 78
1867 28 0 0 0 0 12 0 0 0 0 0 21 57
1867 29 0 10 0 13 0 Q 0 0 0 22 36
1867 30 Q ie) 0 i ie) 9 0 11 0 34 27
1867, 31 0 14 1 0 0 0 27
Mean 0.0 0.7 9.2 5.1 2.9 1.5 5.0 4.8 9.8 13.5 9.6 25.2



DAILY SUNSPOT NUMBERS 1874

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1874 «Ol 54 105 58 57 54 37 85 91 18 60 20 16
1874 02 54 88 67 S7 52 34 97 94 19 61 18 8
1874 03 70 90 37 57 58 34 126 93 19 58 18 0
1874 04 52 90 63 45 37 33 72 76 16 28 20 0
1874 05 33 91 63 35 40 33 58 80 33 55 24 ll
1874 «06 49 75 61 19 58 16 82 76 16 28 19 22
1874 (07 52 57 39 54 79 18 82 82 16 25 19 24
1874 «08 39 37 33 55 90 16 85 60 33 48 25 55
1874 09 55 37 16 52 82 16 79 75 16 36 41 39
1874 = 10 55 al 34 55 80 37 97 52 30 58 22 36
1874 «11 4i 37 36 70 61 39 97 76 36 36 16 28
1874 «12 22 37 48 37 38 40 97 61 37 18 33 28
1874 13 25 36 49 55 64 34 87 64 16 18 16 69
1874 «14 40 54 46 44 21 36 70 46 0 16 39 40
1874 «15 60 52 87 39 53 39 76 65 0 33 38 17
1874 «616 39 34 81 38 19 34 90 43 16 31 41 43
187417 75 51 39 37 37 40 76 46 16 54 44 39
1874 «18 72 16 37 8 36 46 63 45 16 67 49 38
1874 19 69 67 34 19 18 $1 58 80 16 52 20 36
1874 «20 54 70 18 16 42 34 48 100 33 67 $1 69
1874 21 50 53 37 0 43 30 48 78 33 67 45 44
1874 922 68 57 19 0 42 48 48 52 51 19 51 20
1874 23 66 88 21 0 37 42 51 $5 49 33 22 ia)
1874 24 55 85 33 16 36 24 60 52 33 16 36 0
1874 25 84 106 57 16 67 18 33 33 33 16 26 0
1874 «26 73 105 54 16 34 25 18 33 33 16 36 26
1874 927 93 88 57 16 18 37 18 33 49 16 24 32
1874 «28 87 70 54 16 19 57 34 33 33 16 22 38
1874 29 90 37 16 22 107 40 52 52 0 16 40
1874 3 99 52 16 22 90 54 37 72 0 16 46
187431 109 72 25 74 36 16 43
Mean 60.8 64.2 46.4 32.0 44.6 38.2 67.8 61.3 28.0 34.3 28.9 29.3

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1875 01 42 16 33 40 40 16 34 36 16 19 23 0 q
1875 02 14 16 38 37 39 19 34 36 0 19 21 0
1875 03 14 8 7 19 39 22 16 36 ie) 25 16 0
1875 04 28 16 33 21 36 21 10 36 0 21 28 0 q
1875 (05 8 16 36 0 18 22 16 18 0 37 8 0 q
1875 06 0 18 39 18 18 22 16 ie) 0 18 0 0
1875 (07 8 16 42 14 18 21 16 i) 0 18 io} 0
1875 08 18 16 39 16 16 21 0 te) ie) 13 0 0
1875 09 16 18 36 16 ie} 19 18 0 0 0 ie} 0
1875 10 8 33 16 36 0 18 21 0 0 0 ie) it}
1875 il 8 16 33 57 0 16 18 ca) 0 0 0 ie)
1875 «12 io) 0 18 55 i} 0 18 i} i) 0 0 38
0 0 0 O oO 0 0
0 0 0 0 0 0 oO
0 0 0 0 ie) 0 6
0 0 Q ie) ie) 0
0 0 0 0 6 ie)
14 0 0 0 ie)
16 te} 0 0 I:
38 0 0 0 |
39 0 0 i
33 0 0
33 0 0
54 18 0
55 34 0
55 16 0
34 16 0
16
16
16
0



DAILY SUNSPOT NUMBERS 1932

1932 OL 13 19 34 8 8 8 21 9 7 7 7 18
1932 02 26 16 46 8 0 0 24 11 7 7 10 13
1932 03 14 17 37 16 0 10 26 9 7 7 13 13
1932 04 8 8 24 9 0 12 31 10 te) i) 12 10
1932 05 8 8 22 0 0 12 34 10 le) 0 ie) 8
1932 06 0 8 22 0 0 23 21 9 0 8 ie) 8
1932 07 0 7 16 0 8 33 14 8 to) 7 ie) 10
1932 08 3 7 10 0 12 39 15 8 0 0 ie) il
1932 09 0 QO 10 0 14 31 11 te) 0 0 ta) 13
1932 10 7 9 8 0 8 31 10 0 it) 0 7 13
1932) 11 0 9 0 i) 9 32 9 8 0 ie) 9 15
1932 12 0 7 0 0 9 lL 8 0 14 7 9 22
1932 13 0 0 0 0 8 8 9 0 7 8 9 23
1932 14 5 ie) te) 0 25 8 0 0 0 7 10 16
1932 15 10 0 0 8 38 8 ie) 0 le} 8 9 15
1932 «16 15 0 0 8 35 16 0 0 0 8 ie) 13
1932 («17 12 0 9 9 41 16 is) 0 0 8 13 18
1932 18 8 0 12 8 40 21 8 0 it) 15 23 20
1932 19 7 0 9 0 27 28 0 0 8 ra 27 19
1932 20 0 0 7 0 38 26 8 Q 0 29 31 16
19320 21 8 0 7 18 30 32 it) ie) 19 20 25 0
1932 22 19 0 7 34 31 27 7 ie) 8 19 12 0
1932 23 17 18 0 29 31 31 0 0 0 20 0 0
1932 24 16 23 7 23 34 29 0 13 8 12 0 0
1932 25 26 26 0 31 23 40 le} 19 8 il 0 ie}
1932 26 44 26 8 31 22 30 0 22 0 10 0 0
1932 27 37 39 15 32 18 26 8 26 3 8 0 10
1932 28 18 31 15 27 Vv 31 8 16 8 8 0 il
1932 29 18 29 8 24 10 22 9 17 8 7 7 10
1932 30 18 8 14 10 24 9 8 7 6 12 9
1932 0 31 7 7 8 9 8 7 8
Mean 12.1 10.6 11.2 11.2 17.9 22.2 9.6 6.8 4.0 8.9 8.2 11.0
DAILY SUNSPOT NUMBERS 1933
Year Day dan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1933 Ol le) 45 10 9 0 QO 0 0 0 ie) 10 ie)
1933. 02 te) 48 10 8 8 7 0 0 7 ie) 0 0
1933 03 8 67 10 0 0 7 0 ) 7 0 0 0
1933, 04 15 59 13 0 0 7 0 0 7 ie) 8 0
1933, 05 17 62 11 it} 0 7 ie) 0 0 ie} Qo i)
1933 06 v7 67 11 ti) 0 14 7 0 15 0 ie) is)
1933 07 19 53 ll 0 0 2 v7 0 19 0 0 0
1933, 08 20 $3 14 0 0 0 7 0 12 0O 0 0
1933 09 16 47 9 0 3 0 18 0 ll 0 0 0
1933 10 18 33 8 0 8 0 14 0 7 8 0 0
193300 11 17 33 7 0 if) 0 8 0 0 ie) 0 8
1933 12 26 16 7 0 0 0 7 7 0 2 0 ie)
1933 13 42 i ie) 0 0 12 Qo 0 0 te) ie) ie)
1933 14 36 8 o 0 QO 16 i 0 0 0 ie} it}
1933) 15 27 to) ie) 0 oO 19 9 0 0 0 ie) 0
1933 16 14 0 0 0 0 14 lo) ie) 0 0 9 0
1933 17 7 0 0 13 0 10 to) 9 QO 0 9 0
1933 18 0 0 O 13 is) 8 0 i) 0 0 0 0
193319 i) 0 0 20 8 8 0 0 ) 0) 0 0)
1933 20 0 0 0 10 12 8 0 0 0 0 0 0
1933, 21 0 0 0 8 12 8 0 0 7 0 0 0
1933 22 0 id 12 0 it 9 0 0 il 0 0 0
1933 23 0 0 14 i} 17 0 0 0 11 0 0 0
1933 24 i} 0 14 0 12 0 0 0 8 Q le} 0
1933 25 0 0 24 0 8 0 0 0 0 0 Q ie}
1933 26 0 0 29 0 0 0 0 0 0 7 0 0
1933 27 0 8 26 0 0 0 0 ie) 0 20 0 0
1933 28 9 11 28 0 0 0 0 0 11 19 0 0
1933 29 12 22 7 0 ie) 0 9 12 14 0 0
1933 30 25 13 ie) 0 ie) 0 ie) 8 13 QO 0
1933, 31 35 10 0 0 ie) 10 0
Mean 12.3 22.2 10.1 2.9 3.2 5.2 2.8 0.2 5.1 3.0 0.6 0.3



MONTHLY MEAN SUNSPOT NUMBERS (Continued)

Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec

dan

Year

11


DAILY SUNSPOT NUMBERS 1882

1882 01 al 46 28 83 23 31 82 45 56 91 102 59
1882 02 50 64 23 89 37 28 69 55 71 103 99 39
1882 03 19 68 37 91 43 33 59 39 111 94 75 28
1882 04 35 71 41 80 43 30 59 28 97 100 72 19
1882 ©6005 41 74 58 78 50 29 48 25 76 77 82 0
1882 06 60 68 48 90 54 ran 34 7 86 77 72 30
1882 (07 38 62 60 108 78 20 19 8 60 31 80 31
1882 08 40 87 76 126 72 31 5 7 38 8 81 56
1882 09 43 85 99 90 119 19 4 31 60 8 56 71
1882 10 28 92 115 89 125 34 13 38 45 18 50 48
188211 22 93 109 108 112 34 27 40 42 21 57 52
1882 12 63 114 71 106 108 33 31 33 42 26 80 45
188213 62 106 66 115 119 38 32 38 53 35 65 30
188214 57 101 78 115 115 51 63 38 34 43 59 69
1882 «15 50 78 75 140 103 41 66 37 42 45 62 53
188216 39 89 77 137 113 51 50 18 15 56 78 56
1882 17 39 87 64 158 115 67 34 16 36 64 63 60
1882 18 53 91 61 135 113 68 66 36 $1 71 90 44
1882 19 53 56 76 164 96 45 47 39 40 89 81 47
1882 20 42 47 85 146 74 47 62 42 36 79 76 41
1882 21 45 52 93 140 58 40 75 60 36 99 89 16
1882 22 50 56 72 7 39 46 76 60 50 89 58 21
1882 23 35 63 81 89 31 49 74 78 51 51 86 29
1882 24 48 66 86 52 14 $2 71 60 48 82 98 25
1882 25 47 47 60 45 20 47 62 67 62 57 108 28
1882 26 46 25 42 33 15 38 43 55 80 60 102 ie}
1882 27 55 25 46 42 13 64 47 §5 80 37 133 27
1882 28 59 34 $5 46 13 83 15 60 81 48 136 54
1882 29 65 69 39 19 100 27 56 78 45 139 51
1882 30 59 61 22 27 87 18 45 73 66 102 87
1882 931 32 60 27 30 37 65 81
Mean 45.0 69.5 66.8 95.8 64.1 45.2 45.4 40.4 57.7 59.2 84.4 41.8

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1883 01 96 40 24 51 20 35 72 39 92 12 99 51
1883 02 91 67 12 76 30 58 62 31 88 23 120 a7
1883 03 99 45 16 89 40 68 62 17 110 28 119 36
1883 04 96 34 4 92 32 100 57 18 96 36 133 9
1883 05 99 36 0 97 16 107 42 27 64 36 79 15
1883 06 87 55 3 93 31 96 39 16 52 $1 98 19
1883 07 69 73 12 81 35 107 40 16 56 69 74 28
1883 08 27 89 25 93 47 115 24 20 60 90 72 29
1883 09 34 74 21 73 60 114 24 33 59 99 54 54
1883 10 49 67 31 50 59 53 39 35 54 129 44 77
1883) 11 48 75 36 61 51 49 53 35 70 157 52 81
1683 12 29 81 57 84 55 43 79 70 82 152 59 92
188313 35 75 70 90 51 45 93 54 104 156 88 94
188314 44 62 47 112 51 38 79 39 84 133 95 101
1883 15 78 60 46 114 60 49 93 36 75 133 79 65
1883 16 65 59 69 108 41 39 115 52 52 134 109 86
1883. 17 64 56 46 110 45 66 109 63 63 120 133 78
1883 18 64 40 54 102 57 §3 127 $4 61 86 123 89
1883 19 63 39 48 100 38 61 126 56 57 53 116 69
1883 20 53 35 46 78 30 75 145 41 35 55 103 92
1883 21 72 24 57 81 25 85 138 47 19 59 100 122
1883 22 79 26 54 90 7 73 129 48 20 54 107 127
1883 23 72 0 62 83 27 89 144 41 22 59 86 120
188324 57 9 66 83 13 82 130 43 14 62 93 120
1883 25 42 pal 78 66 7 101 113 40 0 58 75 120
1883 26 36 20 52 78 4 92 110 62 7 76 36 111
1883 27 52 33 57 75 0 103 75 56 19 82 55 84
1883 28 49 19 35 63 4 102 47 77 22 100 36 89
1883 29 48 50 66 4 99 35 68 23 98 57 90
1883 30 29 71 23 7 93 56 95 19 95 40 82
188331 53 77 19 42 97 102 77
Mean 60.6 46.9 42.8 82.1 31.5 76.3 80.6 46.0 52.6 83.8 84,5 75.9





DAILY SUNSPOT NUMBERS 1916



DAILY SUNSPOT NUMBERS 1826

Year Day Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1826 601 19 16 17 61 46 72 61 $2 35 17 49
1826 02 14 34 14 61 36 71 62 a7 $7 16 38
1826 03 14 54 56 36 37 72 48 49 52
1826 04 49 14 54 44 34 15 55 48 63 V7 55
1826 05 7 29 66 44 47 30 41 27 36 19

1826 06 16 15 55 14 61 44 27 69 0 50 16 94
1826 07 7 16 25 14 29 45 45 91 0 49 21 161
1826 08 32 52 25 14 32 29 57 85 0 50 24

1826 09 30 32 29 31 29 86 86 9 v7 136
1826 «610 29 22 34 45 15 29 71 72 0 46 79
1826 11 18 36 41 15 45 90 69 14 46 49 46
1826 12 30 19 34 41 15 30 70 56 14 32 64 12
1826 13 4 v7 31 41 15 30 82 30 0 39 48 30
1826 «14 12 14 27 65 14 al 81 27 0 36 69 64
1826 «15 14 27 28 32 44 66 27 ie) 51 $1

1826 616 14 7 31 31 29 14 47 0 0 $2 55

1826 17 14 7 50 32 29 14 64 0 0 34

1826 «18 0 16 52 7 47 14 59 0 0 46 159

1826 19 14 61 16 $2 14 86 0 16 41

1826 = 20 0 0 14 45 14 42 0 30 36

18260 21 0 14 49 0 29 0 16 39 29
182622 0 46 0 29 14 30 ie) 35 42 31
1826 23 12 45 it) 29 14 31 ie) 31 61 4 44
1826 24 16 4 0 34 14 16 22 16 85 72
1826 «25 19 0 14 46 21 15 89 41



DAILY SUNSPOT NUMBERS 1912

Mar Apr May

Feb

dan

Year Day

SECSOSSGGOSOMEDOOODOCODD000000000

CONnWOHDETMITDOOOOOSDODSDOD000000000
aaa

BHTOCOCCCCOOSCOOOCCOON TORARRARORKROCO
as = as

AMMANGCORROROROCOSCCOCOOCCOOD0OMaR@
aa a a4

POCSPCCCONNMOWNRODDOSCOOOOOOOOOR
TNEN EST

gengooooc00000000

SOOCSCCOSCOSCSODODCOODOOCOCOCCOOOOOR

SSSCCDCSCOSOCODCOSOSOOCOMODDRC0000000

PNR TOONDAQGAMTMOR@MHAOKAMTMORDOAOd
SSSSSSSSS SAAS ASA ARNAN ANNAN NAD
NANA ANN NN NANA NAA
SAAS AS A eee ed
BDRBAABARBAAAAAAAADDAAANDDADADAAA
pa ee ee ad al a a ss

4.4

4.5

4.9

0.0

0.3

Mean

'
'
t
t
1
t
i
H
4
H
H
H
H
H
'
‘
‘
H
H
t
4
t
1
'
t
|
1
1
1
t
‘
1
i

DAILY SUNSPOT NUMBERS 1913

Feb Mar Apr May dun

dan

Year Day

SSCSCOOSCCRSSOOSCOSODOOSCOCOORNaLwOOOO

CPOCTCCOROOCOOCOSOSCOCOOCOCOCOOOMmMONGCONA
ao SASaa

SPOOSSCDDCOSOSCOOODDO COCO ORNCOOOOOCOD

SODCCD CO MMOEMMRDDO00000000000000

SPEPOKDCODDSCCOESCSODODOSCOOOOCOODD0000

SESDODDCDDSCOSCOOSOOOO COO OOCeCOOCOO

SCoogrN SCC OCC CO SDeEC DCCC CCOSCR0000

SPSCOTOSCCCOCSCSCORNRAOODD000000000000

PECTSCOSSODSOS COSCO ORN FONNORawo

ON DSOSSCOSOSSDSOOSMRNGGOSOCOOHLSSEO00

PUM THOR DMOMAMTMORDMAOTAMTNMONDAGG
SSSSSSSS SATA AARON MANAAANAN A
MMMAMMOMAMMIMMMAIMMMMMMMMMMMMMMMMAI
Tt et ead ek ed eed et ed ect ed ect ect ect eat eat ed ed eed eat ed ded dtd eet
BRARADAAADARADAAAADAADADAADAAAG
SAA A ett dtd td ed et ed tet

2.9 0.5

2.3

Mean

'
t
t
1
H
H
‘
'
1
t
'
i
H
t
t
t
t
t
{
1
1

68


DAILY SUNSPOT NUMBERS 1898

1898 01 28 id 22 9 40 29 14 54 22 $1 65 16
1898 02 23 ti) 16 15 29 41 i) 65 13 34 61 23
1898 03 30 0 38 17 14 42 0 61 16 40 60 24
1898 04 34 21 46 1 26 23 0 59 7 65 63 23
1898 05 32 20 54 13 9 15 0 53 40 69 70 22
1898 606 26 35 45 26 7 24 0 58 38 50 71 21
1898 07 28 37 64 29 36 23 0 44 60 54 66 28
1898 08 13 28 76 33 41 21 te) 40 49 44 $1 25
1898 09 25 50 90 27 48 0 0 43 53 38 50 22
1898 610 19 53 89 40 21 10 8 38 58 27 52 18
1898 «11 13 46 86 19 25 8 0 38 64 20 35 il
1898 = 12 15 54 82 16 22 7 0 58 70 29 32 10
1898 «13 7 64 86 VW 41 7 15 49 67 18 24 8
1898 «14 23 48 97 0 32 13 0 41 54 20 16 7
1898 «15 24 70 76 9 31 20 8 40 $1 23 13 0
1898 «16 36 70 61 if) 29 24 nn 29 38 28 13 10
1898 «17 47 57 43 0 18 25 8 33 39 16 10 9
1898 «18 61 91 26 0 16 34 7 16 37 15 13 15
1898 «19 65 68 14 ie) 15 38 9 8 26 32 14 16
1898 20 4S 46 0 0 22 13 11 0 13 8 12 8
1898 21 48 16 0 tt) 30 10 ll 8 10 9 10 7
1898 22 48 16 22 0 27 10 19 7 23 8 il 7
1898 23 51 29 0 0 7 22 15 v7 16 20 8 0
1898 9624 48 7 0 8 17 15 v7 7 20 25 10 0
1898 25 52 16 7 8 25 31 19 0 ll 26 14 0
1898 26 25 24 9 14 29 44 Vv 20 V7 35 13 0
1898 27 23 20 9 19 30 31 7 20 12 $7 13 0
1898 28 19 23 8 36 23 36 7 26 32 56 16 0
1898 = 29 10 7 39 7 23 10 8 38 66 18 14
1898 930 8 ie) 31 20 29 15 8 41 41 24 29
1898 31 0 4 44 52 16 41 18
Mean 30.2 36.4 38.3 14.5 25.8 22.3 9.0 31.4 34.8 34.4 30.9 12.6
DAILY SUNSPOT NUMBERS 1899
Year Day Jan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1899 Ol 11 20 16 13 7 9 24 0 0 15 8 10
1899 02 34 29 20 8 7 ie) 13 ll ie} 7 7 10
1899 03 23 27 25 16 7 7 26 0 7 0 te) 7
1899 04 26 25 il 13 7 7 29 ie) 7 0 ty) 13
1899 05 33 20 i) 13 7 12 27 0 7 0 0 12
1899 06 58 22 0 10 0 4 25 0 0 0 0 13
1899 07 39 10 0 7 0 15 v7 0 0 io} 0 14
1899 08 39 20 0 QO 0 23 20 0 0 0 0 v7
1899 09 45 13 7 9 lv) 26 22 it) ie) 7 Q 7
1899 10 23 12 14 15 i) 23 20 0 0 7 0 0
1899 «11 26 8 7 29 0 27 29 tt) 0 15 13 7
1899 12 21 ie) 7 23 7 37 25 0 0 8 7 12
1899 13 17 i) 9 29 7 31 23 0 5 ie) 25 12
1899-14 15 7 8 16 1 28 16 0 14 0 7 24
189915 V7 0 16 16 7 33 18 0 6 oO 14 32
1899 16 16 is) 27 7 16 27 14 0 0 0 18 30
1899 17 15 0 34 13 O 31 0 Q 0 0 23 27
189918 7 0 32 15 4 26 ti) 0 7 0 20 25
189919 9 7 42 14 15 22 to) 0 8 0 ig 22
1899 20 0 7 37 10 25 15 0 it) 7 0 10 lo}
1899 21 0 2 43 15 lL 0 0 0 7 0 1 io)
1899 22 4 8 52 13 10 2 0 0 7 QO 0 0
1899 23 14 7 28 20 10 7 QO it) 7 15 7 2
189924 10 Q 17 14 13 10 0 QO 2 19 5 0
189925 13 0 22 14 12 16 0 7 9 36 12 0
1899 26 14 0 26 16 11 26 13 20 29 49 il ie)
1899 27 v7 0 23 19 ll 37 12 20 35 68 0 QO
1899-28 14 13 14 i 10 33 7 13 37 62 11 7
189929 13 7 9 8 47 23 id) 34 $2 9 8
1899 30 v7 8 8 8 23 14 13 16 24 7 8
189931 13 10 7 3 7 19 7
Mean 19.5 9.2 18.1 14.2 7.7 20.8 13.5 2.9 8.4 13.0 7.8 10.5



SMOOTHED MONTHLY MEAN SUNSPOT NUMBERS (Continued)

Year dan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1926 62.6 64.1 65.1 65.2 65.4 64.7 64.3 65.7 66.9 69.5 72.4 72.4
1927 72.0 71.8 71.7 71.7 71.6 70.5 69.1 68.4 68.3 68.4 67.7 69.0
1928 72.1 75.1 77.3 78.1 77.3 77.2 771 76.1 74.2 71.6 69.2 67.7
1929 66.2 64.3 61.3 58.6 59.6 63.0 64.8 64.0 62.8 61.1 60.6 57.5
1930 53.6 49.8 48.0 47.1 44.2 39.0 33.5 31.2 30.7 30.2 29.4 28.3
1931 27.6 26.9 25.9 24.2 22.6 21.6 21.1 19.7 17.8 16.3 14.8 14.8
1932 14.8 14.2 13.3 12.6 12.2 11.4 11.2 11.7 12.0 11.7 10.7 9.4
1933 8.4 7.9 7.7 7.5 6.9 6.2 5.4 4.3 3.4 3.6 4.6 5.4
1934 5.7 6.3 6.6 6.7 7.2 8.1 9.4 10.6 11.9 12.7 13.0 15.0
1935 17.6 19.6 22.0 25.6 29.9 34.2 37.9 42.0 46.5 $1.3 55.0 57.2
1936 59.0 62.2 65.9 68.8 72.5 77.2 82.6 87.8 90.3 92,1 96.1 101.2
1937 107.6 113.5 116.7 119.2 119.0 115.8 113.0 111.2 110.9 110.6 110.8 109.8
1938 109.3, 109.2 107.9 106.3 107.1 109.4 108.8 106.3 103.6 103.0 103.0 102.8
1939 101.1 96.9 97.4 97.9 95.2 90.9 87.6 85.5 85.5 84.3 79.6 76.3
1940 74.2 73.0 71.1 67.8 66.0 66.7 67.6 66.8 64.6 61.9 $9.7 57.6
1941 56.6 54.7 52.8 52.4 51.2 43.0 47,0 47.0 47.6 49.2 $0.2 47.8
1942 43.7 41.1 36.5 33.3 31.8 31.0 29.6 27.7 25.6 23.0 21.1 20.5
1943 20.1 19.9 19.6 18.8 17.5 16.5 16.0 14.4 12.6 10.8 9.2 8.6
1944 8.2 7.7 7.8 8.4 8.8 9.2 10.2 11.3 12.3 14.0 16.5 19.0
1945 21.9 23.8 25.1 28.1 31.7 33.1 34.3 38.6 43.9 48.1 $2.1 56.0
1946 60.6 67.0 72.9 76.8 81.4 88.6 95.3 100.2 104.3 109.6 117.6 126.2
1947 131.7 136.8 143.4 149.0 151.8 151.7 151.2 148.9 145.5 145.7 146.2 145.3
1948 144.8 142.8 140.5 138.2 135.8 135.3 136.6 141.1 147.7 148.5 143.9 139.2
1949 136.6 134.5 133.2 133.0 134.8 136.0 134.4 130.0 124.4 121.0 119.6 118.0
1950 115.0 111.9 106.4 99.5 92.9 86.6 82.2 79.0 75.3 72.2 71.4 72.2
1951 71.7 69.5 69.8 70.7 70.2 69.8 68.6 66.3 63.3 59.2 53.0 46.8
1952 43.2 42.0 39.5 36.0 33.6 31.9 30.8 29.4 28.2 27.6 27.1 26.0
1953 24.1 21.6 19.9 18.9 17.4 15.2 12.8 11.5 11.4 10.4 8.8 7.4
1954 6.4 5.6 4.2 3.4 3.7 4.2 5.4 7.2 7.8 7.9 9.5 12.0
1955 14.2 16.4 19.5 23.4 28.8 35,1 40.1 46.5 §5.5 64.4 73.0 81.0
1956 88.8 98.5 109.3 118.7 127.4 136.9 145.5 149.6 151.5 155.8 159.6 164.3
1957 170.2 172.2 «174.3, 181.0 «185.5 187.9 191.4 194.4 197.3 199.5 200.8 200.1
1958 199.0 200.9 201.3 196.8 191.4 186.8 185.2 184.9 183.8 182.2 180.7 180.5
1959 178.6 176.9 174.5 169.2 165.1 161.4 155.8 151.3 146.3 141.1 137.2 132.5
1960 128.9 125.0 121.6 119.6 117.0 113.9 108.4 101.9 97.2 92.6 87.2 82.9
1961 80.2 74.8 68.9 64,3 60.1 55.8 $3.1 52.5 $2.3 51.4 50.5 48.7
1962 45.2 41.8 39.8 39.4 39.2 38.3 36.8 34.9 32.7 30.8 30.0 29.8
1963 29.4 29.8 29.7 29.0 28.7 28.2 27.7 27.2 26.9 26.0 23.8 21.3
1964 19.5 17.8 15.4 12.7 10.9 10.2 10.3 10.2 9.9 9.6 10.2 11.0
1965 11.7 12.0 12.5 13.6 14.6 15.0 15.5 16.4 17.4 19.7 22.3 24.5
1966 27.7 31.3 34.5 37.4 40.7 44.6 50.3 56.6 63.1 67.6 70.2 72.7
1967 75.0 78.8 82.2 84.6 87.4 91.3 94.1 95.3 95.3 95.0 97.1 100.6
1968 102.6 102.9 104.7 107.2 107.6 106.6 105.2 104.8 107.0 109.9 110.6 110.1
1969 110.0 109.6 108.0 106.4 106.2 106.1 105.8 106.4 105.4 104.1 104.6 104.9
1970 105.6 106.0 106.2 106.1 105.8 105.3 103.8 101.0 97.2 93.9 89.4 84.1
1971 80.4 77.8 74.4 70.9 68.1 66.7 65.4 64.6 65.8 66.2 66.8 69.4
1972 70.8 71.2 72.4 73.4 72.9 70.5 68.2 65.5 62.2 60.6 58.7 55.1
1973 $0.9 496.5 44.2 42.7 40.7 39.1 37.5 36.1 34.4 32.6 31.8 31.5
1974 32.7 34.4 34.0 33.9 34.6 34.5 34.0 33.1 32.1 30.3 27.6 25.2
1975 23.0 22.1 21.3 18.6 16.8 16.0 15.0 14.2 14.4 15.4 16.1 16.2
1976 15.2 13.2 12.2 12.6 12.5 12.2 12.9 14.0 14,3 13.4 13.5 14.8
1977 16.7 18.1 20.0 22.2 24.2 26.3 29.0 33.4 39.1 45.6 51.9 56.9
1978 61.3 64.5 69.6 76.9 83.2 89.3 97.4 104.0 108.4 111.1 113.3 117.7
1979 123.7 130.9 136.5 141.1 147.2 «153.0 155.0 155.4 155.7 157.8 162.3 164.5
1980 163.9 162.6 160.9 158.7 156.3 154.7 152.8 150.3 150.1 150.2 147.7 142.7
1981 140.3 141.5 143.0 143.4 142.9 141.5 140.3. 141.1 142.8 142.2 138.9 137.8
1982 137.0 133.3, 129.2) 124.3, 119.9 117.3. 115.2. 109.4 101.0 95.7 94.7 94.6
1983 92.8 90.3 85.9 81.5 77.1 70.5 65.5 65.8 67.9 68.2 66.8 64.0
1984 60.2 56.4 53.0 49.8 47.5 46.5 44.2 39.6 33.9 28.9 24.7 21.7
1985 20.5 19.6 18.6 18.3 18.3 18.0

18



1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846
1846

84

23
14

19
31

19

105

146
120

19
72
75

76
64
56
95
77

31
30

61
109

116

139
162
130

131
132
139
139
129
117
111

96

165

224

174
139

54
55

“100

86
87

50
47

50



DAILY SUNSPOT NUMBERS 1886

3

it)

0

0

7 3

64 24 14 li 3 0 12 44 16
57 26 25 28 0 3 1 33 16
67 13 v7 28 0 16 ral aI 34 Q
53 9 22 il 4 33 27 12 34 6
47 18 43 20 6 23 26 lL 34 3
29 21 42 47 4 28 22 3 32 3
12 18 33 47 15 42 32 0 15 5
3 20 32 58 20 34 35 3 10 3
0 6 31 65 24 46 37 3 9 0
0 7 45 60 27 34 36 3 0 5
0 25 59 43 15 33 36 0 3 12
0 18 44 34 23 29 $1 18 8 11
0 12 55 35 23 27 60 15 0 9
QO 37 57 42 26 29 60 174 0 6
6 57 65 23 30 55 13 (o) 12
tt) s7 94 35 46 56 5 3 1
12 69 33 54 18 ta)

188701 23 18 10 14 3 18 16 50 0 3 4 0
1887 02 18 7 6 3 7 11 18 53 3 6 0 0
1887 03 7 27 3 3 19 11 27 57 6 9 0 9
1887 04 1 27 0 0 20 6 24 52 0 0 ie} 13
1887 05 8 23 0 0 32 8 32 $3 3 3 6 ral
1887 06 il u 0 0 29 18 46 54 4 0 ae 25
1887 07 i 0 le) 0 23 18 58 41 0 0 12 24
1887 08 3 0 ti) 0 40 15 59 30 0 0 12 31
1887 09 1 it) 0 0 43 19 46 22 te) 0 13 27
1887 10 0 0 3 ie) 49 23 36 18 3 0 12 29
1887 il 2 Q 3 to) 27 32 30 0 5 0 14 42
188712 0 0 3 0 15 29 26 0 0 0 15 39
1887 13 0 Q 0 0 18 V7 23 0 3 0 33 7
1887 14 0 0 0 1 14 16 23 16 7 2 25 16
188715 0 0 0 3 23 15 16 33 23 0 22 27
1887 16 ie) i) QO 3 28 4 12 23 ra 6 4 24
1887 «17 0 11 0 3 30 16 13 33 24 4 4 25
1887 18 3 22 8 0 29 20 3 28 22 12 3 29
1887 19 3 23 18 18 36 yal 0 33 al 14 3 27
1887 920 0 25 15 20 28 22 0 33 20 21 13 24

12 25 19 e)

12 7 18 le)

13 to) 18 i)

18 0 QO 0

20 tt) 0 to)

0 0 0

0 0 0

10 3 0

28 ce} 0

14 0 0

14



Year Day

1818 01
1818 02
1818 03
1818 04
1818 05
1818 06
1818 07
1818 08
1818 09
1818 «10
1818 11
1818 12
1818 13
1818 «14
1818 «615
1818 16
1818 17
1818 «18
1818 19
1818 20
1818 9 21
1818 22
1818 923
1818 924
1818 925
1818 26
1818 927

39

22

53
35
35
16

46

ecco Oo Oo Oo

oo

15

34
35
40

29

25
19

WV

29

13

-
e000 NO

RBaDoCeOOCC00

es
°

DAILY SUNSPOT NUMBERS 1818

29

25
27

30
97

51
32
34
36
52

59

36

24

10
13

10
14

10

23

18

33

50
63



DAILY SUNSPOT NUMBERS 1952

1953 01 16 0 ta) 43 46 15 0 le) 7 7 12 0
1953 02 15 7 te) 49 40 28 7 7 0 0 il 0
1953 03 20 8 0 50 35 23 7 12 7 7 10 io}
1953 04 24 8 0 57 26 51 0 12 7 7 9 io}
1953 05 24 8 14 35 9 35 0 ll 7 7 0 0
1953 06 35 10 0 35 8 32 7 10 14 13 i lo}
1953 07 34 14 7 38 8 36 7 16 9 13 0 9
1953 08 45 8 0 43 0 30 0 12 24 14 0 io}
1953 09 50 14 le) 30 0 28 9 29 23 12 0 io}
1953 10 55 13 0 21 0 26 18 48 28 10 0 0
1953) 41 59 13 le) 12 0 18 20 73 28 9 0 io}
1953 12 59 7 ie) 0 0 8 16 77 30 14 0 lo}
1953 13 60 le} 7 0 0 7 23 73 18 14 0 io}
195314 62 ie} 15 te} 0 13 24 65 29 29 0 0
1953 15 60 0 8 0 0 24 38 62 41 23 0 0
1953 16 46 0 7 to} 7 33 20 54 42 7 0 0
1953 17 37 0 0 ie} 8 33 7 47 38 9 0 0
1953 18 30 0 8 7 14 20 2i 31 38 id 0 0
1953 19 25 0 10 7 10 25 1 26 34 0 0 0
1953 20 7 0 8 io} 10 26 8 24 21 0 7 0
1953.21 14 0 10 ie} 11 22 14 7 25 7 0 7
1953 22 18 0 10 9 il 20 0 15 16 0 0 0
1953 23 8 0 10 27 11 12 0 8 9 it} 0 ie}
1953 24 8 0 9 33 13 12 io} 0 15 7 0 8
195325 0 0 9 45 18 15 0 0 18 0 it} 9
1953 26 0 0 7 57 11 20 0 0 21 12 0 9
195327 0 0 7 66 10 21 0 0 7 9 0 ll
1953 28 0 0 25 63 18 7 0 0 8 7 0 10
1953 29 0 32 57 24 8 te} 0 7 i} QO 9
1953. 30 0 47 49 20 7 0 0 7 0 0 7
1953.31 o 50 19 0 tt) 7 0



DAILY SUNSPOT NUMBERS 1860



Year Day

1942 (01
1942 02
1942 03
1942 04
1942 05
1942 06
1942 07
1942 08
1942 09
1942 «10
1942 11
1942 12
1942 13

DAILY SUNSPOT NUMBERS 1942

83

a



DAILY SUNSPOT NUMBERS 1896

1896 01 49 59 89 84 29 56 34 10 49 16 24 29
1896 02 35 55 66 112 25 60 40 18 27 14 16 47
1896 03 38 56 110 93 28 61 29 19 21 17 27 46
1896 04 35 56 86 113 29 33 37 7 18 10 38 32
1896 05 51 $1 74 93 35 31 43 15 28 0 30 65
1896 06 §5 50 69 76 25 32 42 10 22 14 23 58
1896 07 35 42 51 65 20 25 52 ti) 36 7 35 54
1896 08 36 62 50 56 34 7 41 QO 52 16 41 45
1896 09 16 32 30 59 21 4. 40 13 77 7 60 61
1896 10 7 32 37 45 7 60 40 23 82 21 73 49
1896 il 7 26 16 46 25 76 39 16 95 25 74 31
1896 «12 1 34 26 21 21 79 34 20 113 26 84 34
1896 13 33 43 26 12 29 89 68 26 93 20 79 30
1896 14 7 64 34 7 20 59 83 25 104 28 93 27
1896 «15 14 38 47 0 14 70 54 29 104 21 46 39
1896 16 13 27 14 0 0 $6 55 45 117 25 42 10
1896 «17 14 12 14 0 14 $3 63 39 109 44 46 44
1896 18 13 17 29 13 16 40 72 36 116 62 30 41
1896 19 21 30 34 13 17 16 82 48 87 69 16 55
1896 20 al 50 54 31 27 14 76 40 103 50 il 33
1896 21 22 55 37 37 24 24 81 36 80 46 33 64
1896 22 14 97 53 39 26 48 50 40 55 57 29 48
1896 23 25 121 65 41 16 64 54 40 47 48 27 39
1896 24 20 107 83 30 ll 79 37 33 55 a7 24 30
189625 20 76 76 43 v7 67 37 31 35 41 16 44
1896 26 35 106 65 46 33 69 33 25 24 34 25 40
1896 27 52 88 30 44 47 52 19 26 14 36 23 40
1896 28 55 94 41 41 67 40 19 23 25 29 26 49
1896 29 46 85 36 22 61 29 20 31 26 16 18 47
1896 30 50 68 31 61 30 12 60 26 25 31 59
1896 31 49 101 49 10 50 19 30
Mean 29.0 57.4 52.0 43.8 27.7 49.0 45.0 27.2 61.3 28.7 38.0 42.6

Year Day Jan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1897 O1 52 59 43 31 34 17 22 24 34 29 9 28
1897 02 44 67 43 46 34 13 26 22 43 37 16 29
1897 03 26 67 46 47 48 14 31 23 69 22 9 25
1897 04 60 75 50 44 48 7 7 19 60 37 7 53
1897 05 $1 $3 54 39 56 14 17 17 83 42 7 48
1897 06 47 $7 55 57 30 7 16 30 73 22 8 50
1897 07 65 36 47 68 31 7 26 32 64 28 10 60
1897 08 48 36 30 68 32 0 41 30 80 20 9 65
1897 09 57 12 46 85 22 io} 35 42 94 9 7 56
1897-10 57 20 46 80 20 0 31 37 64 15 i) 43
1897) 11 39 20 22 55 11 0 23 29 46 20 ia) 66
1897 12 35 13 16 59 13 10 19 44 46 9 QO 56
1897.13 50 10 18 43 ie) 19 23 31 33 22 7 48
189714 41 11 7 29 ie) 19 37 40 30 7 8 53
1897 15 4s 14 29 12 0 15 38 20 11 17 te) 49
1897 16 44 7 37 14 0 9 35 16 10 i 0 54
1897 17 46 16 41 7 ie) 7 23 14 7 11 9 40
1897 18 37 11 20 7 ie) Qo 18 7 34 10 7 37
1897 19 48 7 13 23 8 0 16 9 47 0 7 28
1897 20 38 7 16 18 13 7 21 8 43 16 18 8
1897 21 42 7 if) 18 26 13 31 8 60 20 16 7
189722 37 8 13 7 18 27 37 19 42 10 0 7
189723 $2 16 7 0 23 14 26 14 54 8 0 7
1897 24 35 26 19 QO iL 16 32 7 54 9 0 7
1897) 25 25 34 21 7 23 16 38 16 45 0 11 0
1897 26 20 40 21 14 14 16 31 22 40 0 16 9
1897 27 7 46 7 0 20 7 25 23 49 0 7 20
1897-28 21 47 31 7 24 13 31 8 43 0 13 16
1897. 29 25 31 25 24 19 33 14 $2 0 8 15
1897 30 15 33 20 20 23 27 7 34 0 32 23
1897) 31 50 31 7 31 25 13 24
Mean 40.6 29.4 29.1 31.0 20.0 11.3 27.6 21.8 48.1 14.3 8.4 33.3



DAILY SUNSPOT NUMBERS 1944

Year Day Jan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1944 O01 7 7 8 0 QO 14 0 0 0 42 li ie)
1944 02 0 7 0 ie) 0 8 10 ie} al 32 11 0
1944 03 0 ie) 8 ie) ie) 0 10 7 8 46 12 0
1944 04 ti) ie) 7 0 0 0 7 0 8 41 12 ie)
1944 05 0 i) 0 ie) 0 0 7 10 te) 23 14 7
1944 06 0 if) ia) to) 0 0 7 20 0 15 14 16
1944 (07 it) 0 0 0 0 0 id 22 0 8 te) 16
1944 08 0 0 0 0 0 8 0 25 0 16 0 19
1944 «09 0 0 0 0 0 7 to) 29 8 19 0 25
1944 10 0 0 ) 0 0 8 8 25 1 17 0 44
1944 11 0 0 0 0 0 7 8 30 14 7 il 39
1944 12 0 0 0 0 id) 0 0 28 22 7 16 32
1944 13 0 0 0 0 0 0 0 19 25 0 8 56
1944 (14 0 0 7 0 te) 0 0 24 23 0 O 37
1944 15 0 0 0 0 0 2 0 14 20 8 0 39
1944 16 0 0 8 0 0 3 0 16 14 22 9 32
1944 17 ) 0 14 8 0 8 0 34 12 23 9 31
1944 18 0 ie) 29 0 0 8 7 31 12 21 11 52
1944 19 0 ie) 31 0 0 8 7 18 14 12 1 40
1944 20 0 0 33 0 0 8 7 23 20 v7 10 54
1944 21 0 i 27 0 0 8 ie) 8 21 17 11 51
1944 22 8 0 36 0 0 8 8 Q 22 18 20 49
1944 23 8 to) 36 0 0 8 8 15 20 13 19 39
1944 24 8 te) 22 0 7 8 13 14 23 9 24 41
8 io) 0 ie) 8 7
8 0 0 0 7 7
0 0 i) 7 0
QO QO 7
0 0 0
it) 0



DAILY SUNSPOT NUMBERS 1834

1834
1834
1834
1834
1834
1834
1834

ed

~

w&
BO0000

16

31
32

27
14

17
14

14
14

15

56

50

55

81

42

70

90

95

80

140
152

169
169

164

150
154

122

47

64
75

61

dan Feb
0
0
14 15
ie} 0
15
30
0 30
0 29
16 26
41
29
29
24 29
0
0 29
7
16
0 14
0 14
0 0
i)
4.9 18.1
Jan Feb
44 21
20
0
0 19
0
id)
15
0 31
0
v7
14
14 29
15 32
15 39
ty)
0 37
0
0
15
0 30
0 15
0
15 0
15
47
15
7
7.5 24.5



MINIMA AND MAXIMA OF SUNSPOT NUMBER CYCLES

Sunspot Year Smallest Year Largest Rise Fall Cycle
Cycle of Smoothed of Smoothed to Max to Min Length
Number Minimum* Monthly Mean** Maximum* Monthly Mean** (Yrs) (Yrs) (Yrs)

- 1615.5 4.7 3.5 8.2
-- 1626.0 -- 7.0 8.0 15.0
al 1639.5 -- 5.5 5.5 11.0
-- 1649.0 -- 4.0 6.0 10.0
7 1660.0 -- 5.0 6.0 11.0
-- 1675.0 -- 9.0 4.5 13.5
-- 1685.0 -- 5.5 4.5 10.0
-- 1693.0 -- 3.5 5.0 8.5
- 1705.5 7.5 6.5 14.0
- 1718.2 6.2 5.3 11.5
-- 1727.5 4.0 6.5 10.5
o- 1738.7 >" 4.7 6.3 11.0
7 1750.3 92.6 5.3 4.9 10.2
8.4 1761.5 86.5 6.3 5.0 11.3
11.2 1769.7 115.8 3.2 5.8 9.0
7.2 1778.4 158.5 2.9 6.3 9.2
9.5 1788.1 141.2 3.4 10.2 13.6
3.2 1805.2 49.2 6.9 5.4 12.3
0.0 1816.4 48.7 5.8 6.9 12.7
O.1 1829.9 71.7 6.6 4.0 10.6
7.3 1837.2 146.9 3.3 6.3 9.6
10.5 1848.1 131.6 4.6 7.9 12.5
3.2 1860.1 97.9 4.1 7.1 11.2
5.2 1870.6 140.5 3.4 8.3 11.7
2.2 1883.9 74.6 5.0 5.7 10.7
5.0 1894.1 87.9 4.5 7.6 12.1
2.6 1907.0 64.2 5.3 6.6 11.9
1.5 1917.6 105.4 4.0 6.0 10.0
5.6 1928.4 78.21 4.8 5.4 10.2
3.4 1937.4 119.2 3.6 6.8 10.4
7.7 1947.5 151.8 3.3 6.8 10.1
3.4 1957.9 201.3 3.6 7.0 10.6
9.6 1968.9 110.6 4.0 7.6 11.6
12.2 1979.9 164.5 4
5.7 116.1 8 6.2 11.1

*When observations permit, a date selected as either a cycle minimum or maximum is based in part on an
average of the times extremes are reached in the monthly mean sunspot number, in the smoothed monthly
mean Sunspot number, and in the monthly mean number af spot groups alone. Two more measures are used
at time of sunspot minimum: the number of spotless days and the frequency of occurrence of "old" and
"new" cycle spot groups.

**The smoothed monthly mean sunspot number is defined here as the arithmetic average of two sequential
12-month running means of monthly mean numbers.



DAILY SUNSPOT NUMBERS 1864

1864 01 14 67 94 $1 22 58 18 44 42 32 76 84
1864 02 ral 60 109 16 19 113 52 34 39 23 77 90
1864 03 29 61 105 36 42 85 51 40 38 21 100 60
1864 04 19 42 88 35 46 106 52 45 53 52 60 37
1864 0S 14 50 60 34 $1 124 57 53 26 29 57 27
1864 06 35 ral 41 58 $1 121 58 59 26 27 49 1
1864 (07 51 45 52 58 36 144 54 92 23 21 52 16
1864 08 45 59 51 54 34 87 §7 105 24 37 51 10
1864 09 42 45 72 54 34 127 81 127 32 43 $2 1
1864 «10 36 46 67 36 33 82 81 117 43 23 75 10
186411 29 51 73 36 16 45 88 100 33 34 74 22
186412 42 16 50 37 44 37 118 133 35 11 56 21
1864 13 46 37 55 36 36 57 91 134 35 v7 $1 10
186414 46 19 55 34 yan 48 66 107 27 35 16 19
1864 15 52 19 §5 34 40 51 107 96 10 33 34 28
1864 16 73 36 55 41 40 57 67 66 28 20 40 33
18640 «17 79 55 70 44 45 40 72 37 28 14 47 30
1864 «18 93 87 87 50 45 64 60 35 35 11 38 24
1864 19 70 51 52 52 45 al 37 21 18 17 40 25
1864 20 106 58 52 50 63 32 37 21 25 16 40 78
1864 21 118 51 52 43 73 27 56 18 23 39 40 19
1864 22 103 34 67 50 73 30 36 12 10 al 40 0
1864 23 102 36 62 29 52 24 50 i 0 69 57 21
1864 24 82 34 69 31 34 21 16 14 23 74 73 23
1864 25 102 33 70 30 21 33 27 0 43 50 78 26
1864 26 96 51 70 14 21 21 16 te) 33 44 63 29
1864 27 64 52 70 0 27 30 34 14 35 61 49 27
1864 28 49 72 75 0 52 16 37 25 24 30 73 33
1864 29 37 79 70 0 36 16 34 33 23 43 83 40
1864 30 46 56 32 $1 18 39 56 al 47 86 il
186431 49 52 55 a7 49 56 11
Mean $7.7 47.1 66.3 35.8 40.6 57.8 54.7 54.8 28.5 33.9 57.6 28.6

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1865 O01 36 4 36 33 29 39 26 54 26 16 0 42
1865 02 19 10 39 26 49 45 1 90 24 20 Le} 42
1865 03 29 10 43 25 33 47 0 79 33 20 0 42
1865 04 32 22 33 16 52 46 0 60 37 20 11 18
1865 05 45 30 47 11 53 59 10 $1 35 10 13 20
1865 06 36 14 48 10 57 46 10 20 21 10 39 15
1865 07 30 42 31 0 62 43 24 49 21 20 40 10
1865 08 33 37 24 23 65 $2 37 38 0 29 42 ie)
1865 09 33 79 36 18 44 54 53 38 0 18 57 ie)
1865 10 47 57 36 23 33 77 16 $4 0 24 42 ie)
1865 11 39 76 69 21 30 36 20 43 0 37 32 14
1865 12 40 82 88 21 34 60 37 32 ie) 44 34 10
1865 13 36 81 80 22 34 56 36 19 0 53 35 10
1865 14 46 73 73 to) 28 34 31 14 le) 33 36 is)
1865 15 20 58 60 15 28 32 10 18 15 42 19 0
1865 16 22 55 60 66 14 33 10 0 15 35 31 0
1865 17 33 45 63 58 16 30 31 18 14 39 17 19
1865 18 42 34 45 71 18 36 29 23 33 25 15 19
1865 19 32 43 41 60 27 24 33 23 29 16 12 0
1865 20 62 34 42 56 30 13 35 33 30 0 10 ie)
1865 21 58 16 - 26 54 19 0 17 23 23 0 O 14
1865 22 66 18 4 44 15 0 33 16 15 0 14 ie)
1865 23 113 18 QO 27 0 25 16 31 19 9 7 15
1865 24 98 16 0 11 0 23 31 42 30 te) 26 0
1865 25 112 42 19 15 24 16 21 48 42 0 22 0
1865 26 113 37 20 41 25 13 26 39 33 ia) 33 0
1865 27 79 42 22 44 26 10 50 31 37 0 37 15
1865 28 60 15 34 18 68 it 36 52 48 Q 42 19
1865 29 33 28 29 62 27 42 53 34 10 32 16
1865 30 56 24 25 39 20 27 43 34 10 29 15
1865 31 10 42 56 72 37 0 42
Mean 48.7 39.3 39.5 29.4 34.5 33.6 26.8 37.8 21.6 17.1 24.6 12.8



HISTORICAL MEASUREMENTS (Continued)

Moreover, during the 17th and 18th Centuries, the few observers who noted sunspots
made their observations from Central Europe, where the atmospheric transparency dif-
fered greatly between the summer and the winter months.

The numbers tabulated here are not of uniform quality: they range from poor be-
tween 1700 and 1748 to questionable between 1749 and 1817 and from good between 1818
and 1847 to reliable from 1848 on. Despite these serious limitations, sunspot num-
bers increase in importance with each passing year, because they reach back further
in time than any other index of solar activity. This continuous daily diary serves
as an important link with the past for studies of the sun's long-term variability.
Furthermore, the measurement of sunspot numbers does not require sophisticated and
costly equipment, and they become available soon after they are recorded.



DAILY SUNSPOT NUMBERS 1852

38



SMOOTHED MONTHLY MEAN SUNSPOT NUMBERS (Continued)

Feb Mar Apr May dun dul Aug Sep Oct Nov Dec

Jan

Year

17.1
56.9
105.8
135.4

14.9
50.5
101.7
138.5

12.6
47.1
93.8
139.6

v7


Year Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec

1926 71.8 69.9 62.5 38.5 64.3 73.5 $2.3 61.6 60.8 71.5 60.5 79.4
1927 81.6 93.0 69.6 93.5 79.1 59.1 54.9 53.8 68.4 63.1 67.2 45.2
1928 83.5 73.5 85.4 80.6 77.0 91.4 98.0 83.8 89.7 61.4 50.3 59.0
1929 68.9 62.8 50.2 52.8 58.2 71.9 70,2 65.8 34.4 54.0 81.1 108.0
1930 65.3 49.9 35.0 38.2 36.8 28.8 21.9 24.9 32.1 34.4 35.6 25.8
1931 14.6 43.1 30.0 31.2 24.6 3 17.4 13.0 19.0 10.0 18.7 17.8
1932 12.1 10.6 11.2 11.2 17.9 2 9.6 6.8 4.0 8.9 8.2 11.0
1933 12.3 22.2 10.1 2.9 3.2 . 2.8 0.2 5.1 3.0 0.6 0.3
1934 3.4 7.8 4.3 11.3 19.7 7 9.3 8.3 4.0 5.7 8.7 15.4
1935 18.6 20.5 23.1 12.2 27.3 7 33.9 30.1 42.1 53.2 64.2 61.5
1936 62.8 74.3 77.1 74.9 54.6 70.0 52.3 87.0 76.0 89.0 115.4 123.4
1937 132.5 128.5 83.9 109.3 116.7 130.3 145.1 137.7 100.7 124.9 74.4 88.8
1938 98.4 119.2 86.5 101.0 127.4 97.5 165.3 115.7 89.6 99.1 122.2 92.7
1939 80.3 77.4 64.6 109.1 118.3  101,0 97.6 105.8 112.6 88.1 68.1 42.1
1940 50.5 59.4 83.3 60.7 54.4 83.9 67.5 105.5 66.5 55.0 58.4 68.3
1941 45.6 44.5 46.4 32.8 29.5 59.8 66.9 60.0 65.9 46.3 38.4 33.7
1942 35.6 52.8 54.2 60.7 25.0 11.4 17.7 20.2 17.2 19.2 30.7 22.5
1943 12.4 28.9 27.4 26.1 4.1 7.6 13.2 19.4 10.0 7.8 10.2 18.8
1944 3.7 0.5 11.0 0.3 2.5 5.0 5.0 16.7 14.3 16.9 10.8 28.4
1945 18.5 12.7 21.5 32.0 30.6 36.2 42.6 25.9 34.9 68.8 46.0 27.4
1946 47.6 86.2 76.6 75.7 84.9 73.5 116.2 107.2 94.4 102.3 123.8 121.7
1947 115.7) 133.4 129.8 149.8 201.3 163.9 157.9 188.8 169.4 163.6 128.0 116.5
1948 108.5 86.1 94.8 189.7 174.0 167.8 142.2 157.9 143.3 136.3 95.8 138.0
1949 119.1 182.3 157.5 147.0 106.2 121.7 125.8 123.8 145.3 131.6 143.5 117.6
1950 (101.6 94.8 109.7 113.4 106.2 83.6 91.0 85.2 51.3 61.4 $4.8 54.1
1951 59.9 59.9 55.9 92.9 108.5 100.6 61.5 61.0 83.1 51.6 62.4 45.8
1952 40.7 22.7 22.0 29.1 23.4 36.4 39.3 54.9 28.2 23.8 22.1 34.3
1953 26.5 3.9 10.0 27.8 12.5 21.8 8.6 23.5 19.3 8.2 1.6 2.5
1954 0.2 0.5 10.9 1.8 0.8 0.2 4.8 8.4 1.5 7.0 9.2 7.6
1955 23.1 20.8 4.9 11.3 28.9 31.7 26.7 40.7 42.7 58.5 89.2 76.9
1956 73.6 124.0 118.4 110.7 136.6 116.6 129.1 169.6 173.2 155.3 201.3 192.1
1957 165.0 130.2 157.4 175.2 164.6 200.7 187.2 158.0 235.8 253.8 210.9 239.4
1958 202.5 164.9 190.7 196.0 175.3 171.5 191.4 200.2 201.2 181.5 152.3 187.6
1959 217.4 143.1 185.7 163.3 172.0 168.7 149.6 199.6 145.2 111.4 124.0 125.0
1960 146.3 106.0 102.2 122.0 119.6 110.2 121.7 134.1 127.2 82.8 89.6 85.6
1961 57.9 46.1 53.0 61.4 $1.0 77.4 70.2 55.8 63.6 37.7 32.6 39.9
1962 38.7 50.3 45.6 46.4 43.7 42.0 21.8 21.8 51.3 39.5 26.9 23.2
1963 19.8 24.4 17.1 29.3 43.0 35.9 19.6 33.2 38.8 35.3 23.4 14.9
1964 15.3 17.7 16.5 8.6 9.5 9.1 3.1 9.3 4.7 6.1 7.4 15.1
1965 17.5 14.2 11.7 6.8 24.1 15.9 11.9 8.9 16.8 20.1 15.8 17.0
1966 28.2 24.4 25.3 48.7 45.3 Al 56.7 $1.2 50.2 57.2 57.2 70.4
1967 110.9 93.6 111.8 69.5 86.5 67.3 91.5 107.2 76.8 88.2 94.3 126.4
1968 121.8 111.9 92.2 81.2 127.2 110.3 96.1 109.3 117.2 107.7 86.0 109.8
1969 104.4 120.5 135.8 106.8 120.0 106.0 96.8 98.0 91.3 95.7 93.5 97.9
1970 111.5 127.8 «102.9 109.5 127.5 106.8 112.5 93.0 99.5 86.6 95.2 83.5
1971 91.3 79.0 60.7 71.8 57.5 49.8 81.0 61.4 50.2 $1.7 63.2 82.2
1972 61.5 88.4 80.1 63.2 80.5 88.0 76.5 76.8 64.0 61.3 41.6 45.3
1973 43.4 42.9 46.0 $7.7 42.4 39.5 23.1 25.6 59.3 30.7 23.9 23.3
1974 27.6 26.0 21.3 40.3 39.5 36.0 55.8 33.6 40.2 47.1 25.0 20.5
1975 18.9 11.5 11.5 5.1 9.0 11.4 28.2 39.7 13.9 9.1 19.4 7.8
1976 8.1 4.3 21.9 18.8 12.4 12.2 1.9 16.4 13.5 20.6 5.2 15.3
1977 16.4 23.1 8.7 12.9 18.6 38.5 21.4 30.1 44.0 43.8 29.1 43.2
1978 $1.9 93.6 76.5 99.7 82.7 95.1 70.4 $8.1 138.2 125.1 97.9 122.7
1979 166.6 137.5 138.0 101.5 134.4 149.5 159.4 142.2 188.4 186.2 183.3 176.3
1980 189.6 155.0 126.2 164.1 179.9 157.3 136.3 135.4 155.0 164.7 147.9 174.4
1981 114.0 141.3 135.5 156.4 127.5 90.9 143.8 158.7 167.3 162.4 137.5 150.1
1982 111.2 163.6 153.8 122.0 82.2 110.4 106.1 107.6 118.8 94.7 98.1 127.0
1983 84.3 51.0 66.5 80.7 99.2 91.1 82.2 71.8 50.3 55.8 33.3 33.4
1984 57.0 85.4 83.5 69.7 76.4 46.1 37.4 25.5 15.7 12.0 22.8 18.7
1985 16.5 15.9 17.2 16.2 27.5 24.2 30.7 11.1 3.9 18.6 16.2 17.3

12



INTRODUCTION

A_STANDARD SCHEME FOR COUNTING SUNSPOTS

In 1848 the Swiss astronomer Johann Rudolph Wolf introduced the sunspot number
index--an estimate of the number of spots visible on one hemisphere of the sun. The
observation consists of a daily count over the solar disk of the number of spots

(regardless of size) and

of the number of groups into which they cluster.

Rudolph Wolf arbitrarily defined his daily sunspot number as the total spot count
added to 10 times the number of spot groups, because neither the number of groups

JOHANN RUDOLPH WOLF*
1816-1893

In 1848 Rudolph Wolf devised
a daily method of estimating
solar activity by counting
the number of individual
spots and groups of spots on
the face of the sun. Wolf
chose to compute his sunspot
number by adding 10 times
the number of groups to the
total count of individual
spots, because neither quan-
tity alone completely cap-
tured the level of activity.
Today, Wolf sunspot counts
continue, since no other in-
dex of the sun's activity
reaches into the past as far
and as continuously.

An avid astronomical histo-
rian and an unrivaled expert
on sunspot lore, Wolf con-
firmed the existence of a
cycle in sunspot numbers.

He also more accurately de-
termined the cycle's length
to be 11.1 years by using
early historical records.
Wolf, who became director of
the Zurich Observatory, dis-
covered independently the
coincidence of the sunspot
cycle with disturbances in
the Earth's magnetic field.

*National Portrait Gallery

nor the number of spots alone adequately measured the ac-

tivity. Counting only groups would ignore their great var-
jation in size, since some can contain more than 100 single
spots, while others, only a few. Counting only individual
spots, on the other hand, would ignore their unequal rank,
because spots appearing within an existing group have less
significance than ones emerging where none existed before.

CHANGES TO THE COUNTING METHOD

Since Rudolph Wolf began the sunspot measurement, he set
the standard. And although he counted each spot regardless
of its size, he failed to include those smallest spots vis-
ible only under a stable atmosphere. Around 1882 Wolf's
successors permanently changed the counting method in two
ways to compensate for the large variation in spot size:

(1) by including the smallest spots visible under
an atmosphere of constant transparency and

(2) by weighting spots with penumbrae according
to their size and umbral structure.

Because both modifications raised the daily count from
what Wolf would have recorded, results from the old and the
new methods had to be compared over many years. To isolate
the relative difference between the two techniques, the ra-
tio of the sum of the counts recorded simultaneously under
both schemes was formed, and then that constant was used to
adjust the new observations to Wolf's original scale.

Wolf, himself, preferred measuring sunspot areas, not
estimating sunspot counts, but his limited equipment pre-
vented him from drawing the projected solar image to scale.
Photography could not be used either, since at the time,
the technique was too primitive. Later measurements of
area did show the yearly mean sunspot number to be almost
proportional to sunspot area. It meant that Wolf, through
a fortunate definition of the spot count, nearly achieved
his original goal. Deviations, though, from this propor-
tionality can be significant, as a large, single spot with
its penumbra makes only a small contribution to the sunspot
number but a large one to the area. In contrast, a group
consisting of many tiny spots makes a large contribution to
the sunspot number but only a small one to the area.

i
t
|
'



UAG-19

UAG-20
UAG-21

UAG-22

UAG-23

UAG-23A

UAG-24

UAG-25

UAG-26

UAG-27

UAG-28

UAG-29

UAG-30

UAG~31

UAG-32

UAG-33

UAG-34

UAG-35
UAG-36

UAG SERIES OF REPORTS (Continued)

REEVALUATION OF SOLAR FLARES 1967, by Helen W. Dodson and E. Ruth Hedeman, McMath-Hulbert Ob~
servatory, University of Michigan, Pontiac, MI, and Marta Rovira de Miceli, San Miguel Observa-
tory, Argentina, June 1972, 15 pp.

[Superseded by UAG-30]

PRELIMINARY COMPILATION OF DATA FOR RETROSPECTIVE WORLD INTERVAL JULY 26 - AUGUST 14, 1972, by
J. Virginia Lincoln and Hope I. Leighton, World Data Center A for Solar-Terrestrial Physics,
NOAA, Boulder, CO, November 1972, 128 pp.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES (AE) FOR 1970, by Joe Haskel! Allen, National Geo-
physical and Solar-Terrestrial Data Center, Boulder, CO, November 1972, 146 pp.

U.R.S.1. HANDBOOK OF IONOGRAM INTERPRETATION AND REDUCTION, Second Edition, November 1972,
edited by W.R. Piggott, Radio and Space Research Station, Slough, UK, and K. Rawer, Arbeits-
gruppe fur Physikalische Weltraumforschung, Freiburg, GFR, November 1972, 324 pp, $1.75.

U.R.S.1. HANDBOOK OF IONOGRAM INTERPRETATION AND REDUCTION, Second Edition, Revision of Chapters
1-4, edited by W.R. Piggott, Radio and Space Research Station, Slough, UK, and K. Rawer, Ar-
beitsgruppe fur Physikalische Weltraumforschung, Freiburg, GFR, November 1972, 135 pp, $2.14.

DATA ON SOLAR-GEOPHYSICAL ACTIVITY ASSOCIATED WITH THE MAJOR GROUND LEVEL COSMIC RAY EVENTS OF
24 JANUARY AND 1 SEPTEMBER 1971, Parts 1 and 2, compiled by Helen E. Coffey and J. Virginia Lin-
coln, World Data Center A for Solar-Terrestrial Physics, NOAA, Boulder, CO, December 1972, 462
pp, $2.00 (includes Parts 1 and 2).

OBSERVATIONS OF JUPITER'S SPORADIC RADIO EMISSION IN THE RANGE 7.6-41 MHZ, 9 SEPTEMBER 1968
THROUGH 9 DECEMBER 1971, by James W. Warwick, George A. Dulk and David G. Swann, University of
Colorado, Boulder, CO, February 1973, 35 pp

DATA COMPILATION FOR THE MAGNETOSPHERICALLY QUIET PERIODS FEBRUARY 19-23 AND NOVEMBER 29 - DE-
CEMBER 3, 1970, compiled by Helen E. Coffey and J. Virginia Lincoln, World Data Center A for
Solar-Terrestrial Physics, NOAA, Boulder, CO, May 1973, 129 pp

HIGH SPEED STREAMS IN THE SOLAR WIND, by 0.S. Intriligator, University of Southern California,
Los Angeles, CA, June 1973, 16 pp

COLLECTED DATA REPORTS ON AUGUST 1972 SOLAR-TERRESTRIAL EVENTS, Parts 1, 2 and 3, edited by
Helen E. Coffey, World Data Center A for Solar-Terrestrial Physics, NOAA, Boulder, CO, July
1973, 932 pp, %. 0.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1968, by Joe Haskell Allen, Carl C.
Abston and Leslie 0. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder,
CO, October 1973, 148 pp.

CATALOGUE OF DATA ON SOLAR-TERRESTRIAL PHYSICS, prepared by NOAA Environmental Data Service,
Boulder, CO, October 1973, 317 pp, $1.75. Supersedes catalogs UAG-11, 15 and 20.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1969, by Joe Haskell Allen, Carl C.
Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder,
CO, February 1974, 142 pp.

SYNOPTIC RADIO MAPS OF THE SUN AT 3.3 MM FOR THE YEARS 1967-1969, by Earle B. Mayfield, Kennon
P. White III, and Fred 1. Shimabukuro, Aerospace Corp., £1 Segundo, CA, April 1974, 26 pp

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(10) FOR 1967, by Joe Haskell Allen, Carl C.
Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder,
CO, May 1974, 142 pp.

ABSORPTION DATA FOR THE IGY/IGC AND IQSY, compiled and edited by A.H. Shapley, National Geophys-
ical and Solar-Terrestrial Data Center, Boulder, CO; W.R. Piggott, Appleton Laboratory, Slough,
UK; and K. Rawer, Arbeitsgruppe fur Physikalische Weltraumforschung, Freiburg, GFR, June 1974,
381 pp, $2.00.

[Superseded by UAG-92]

AN ATLAS OF EXTREME ULTRAVIOLET FLASHES OF SOLAR FLARES OBSERVED VIA SUDDEN FREQUENCY DEVIA-
TIONS DURING THE ATM-SKYLAB MISSIONS, by R.F. Donnelly and E.L. Berger, NOAA Space Environment
Laboratory; Lt. J.D. Busman, NOAA Commissioned Corps; B. Henson, NASA Marshall Space Flight Cen-
ter; T.B. Jones, University of Leicester, UK; G.M. Lerfald, NOAA Wave Propagation Laboratory; K.
Najita, University of Hawaii; W.M. Retallack, NOAA Space Environment Laboratory and W.J. Wagner,
Sacramento Peak Observatory, October 1974, 95 pp.

108



Roe
er anovoo

e

CODDCSCDSCSOCSCODCOOOBONAON

DAILY SUNSPOT NUMBERS 1910

a
Seow ccc

Be a

CODOCDODDOCCONOCOMNASBINNO

COCCDCODCONNDOOCCOONNOYW

nm
Fou aear i]

mn

eDDCCDODD COC OOONN

an
OOBOCOCONFaADNGO



DAILY SUNSPOT NUMBERS 1820

1820 01 7 19 0 Q 31 15 18 le} 0

1820 02 19 0 0 20 7 16 0 0

1820 03 0 0 0 15 15 0 0

1820 04 0 0 0 0 15 0 0

1820 05 0 0 0 15 0 15 0 0 0

1820 06 0 ta) 15 0 0 le} 0

1820 07 0 0 31 15 te) 0 0 0 32

1820 08 lo} 0 31 0 0 0

1820 09 0 43 ti) 15 40 0 0 le} ai

1820 10 38 0 36 0 ie) 0

1820 11 0 15 36 0 0 0 0 39

1820 12 0 58 0 0 15

1820 13 15 29 0 56 0 0 15

1820 14 33 0 38 60 0 20 0 15 21

1820 15 29 32 0 60 42 0 38 0 15 23

1820 16 50 16 40 19 0 19 16 30

1820 17 29 7 35 23 ie} 43 32 15

1820 18 15 46 29 20 15 24 7

1820 19 29 16 15 v7 27 16 39

1820 20 15 24 15 16 15 23 16 36 0
0
0
0
0
0
0
0
0
0
0

le) 0 0 te)

ie) 0 ie) 0

lo) 0 ie) 0

0 0 le) tt)

0 0 0 16 lo) 0

0 0 0 0 15 0 0

0 0 ie) 0 i) i) 0

0 0 QO 0 0 to) 0

to) 0 0 to} 0 to) 0

i) 0 0 0 0 0 0

ta) 0 le) 0 0 0 0

QO 0 le) 0 it) io) 0

QO 0 ie) 0 15 le) 0

1821 «14 to) 0 0 18 0 19 0 23 ta) it)
182115 QO ie) 0 0 7 0 0 15 0 0
1821 16 io) 0 0 0 7 15 0 15 0 0
1821 (17 0 0 0 0 17 0
1821 18 0 ti) it) 15 0 0 al 0 24 it)
1821 19 0 16 0 0 25 15 0 35 23 0
1821 20 to) 16 0 QO 0 it) 35 20 0
1821 21 0 0 0 0 15 0 0 38 27 0
1821 22 0 16 0 0 0 0 33 0
1821 23 0 0 0 0 0 0 33 28 8
1821 24 ie) 0 0 0 0 16 33 21 9
1821 25 0 15 0 0 0 20 16 le) Q
1821 26 0 0 0 0 0 21 16 0 QO
18210 27 20 15 ai 0 Q ie) 0 21 le) it)
1821 28 45 0 30 ty) Le} 0 0 V7 16 lo) 0
1821 29 27 ie} 20 0 te} 0 0 32 ie) 0
1821 30 31 0 30 0 Q 0 0 32 32 0 QO
1821 31 28 0 i) 0 0 0





DAILY SUNSPOT NUMBERS 1830

Year Day Jan Feb Mar Apr May Jun dul Aug Sep Oct Nov Dec
1830 01 81 56 133 36 70 49 95 75

1830 02 42 104 62 102 35 62 31 75 81

1830 03 57 117 104 75 16 61 0 61 74 80

1830 04 57 99 102 50 31 59 33 59 94 84

1830 05 46 92 80 1 42 80 71 16 92 90

1830 06 85 50 82 60 59 72 80

1830 07 62 114 61 79 S7 74 86 87

1830 08 65 65 99 56 69 66

1830 09 35 90 65 91 76 28 79 50 56 72
1830 10 31 116 114 106 86 4s 66
1830 «11 147 121 76 54 30 65 69 77 119
1830 12 109 ill 90 45 49 62 76 87 92 91
1830 13 46 114 112 90 61 52 65 85 102 135 76
1830 «14 104 49 72 60 58 64 17 50
163015 102 109 102 77 55 0 66 85

1830 «(16 89 101 7 41 77 65 66

1830 17 105 75 82 85 74 77 78

1830 «18 109 44 61 38 87 101 91
1830-19 60 82 84 63 39 49 60 147 92
1830 20 59 70 79 71 29 74

1830 21 55 70 11 57 59 33 32 72 106 79

1830 22 42 62 94 62 69 26 45 53 121 87 57
1830 23 42 62 59 70 16 45 80 74 90
1830 24 0 57 50 196 61 92 ral 46 57 49 89
1830 025 30 31 166 61 71 45 59 64 79

1830 26 44 62 106 61 61 16 60 59

1830 27 30 74 47 60 80 32 57 45 61 56
1830 28 52 127 109 79 52 72 29 86
1830 29 94 144 45 7 33 76 21 87

1830 30 31 107 130 27 77 34 85 42 86 82



DAILY SUNSPOT NUMBERS 1968



1955
1955
1955
1955

1955
1955

DAILY SUNSPOT NUMBERS 1954

0 0 0

7 to) 0

0 8 i)

0 0 7

id 0 7

0 0 0

i) 0 it

0 7 ie)

0 QO i)

0 0 i)

te) 0 0

0 7 14 0 40

0 10 8 ie) 39

0 15 7 0 15 26

0 8 0 7 7 it 1.

0 15 ie) 9 24 7 18

0 7 0 le} 22 7 7

0 7 0 0 7 7 16

0 i) 9 0 14 7 20

0 0 0 7 4 0 19

0 0 9 vo} 8 0 12

0 0 15 0 8 Le} 7

0 0 18 0 14 0 7

0 8 16 0 8 0 14

0 10 11 0 8 to} 14

lo) 7 9 0 7 0 7

0 7 7 0 0 0 0

0 10 0 le) te) 0 0

0 8 Q QO 0 ie) 13

0 7 0 7 0 0 29
7 ce} ie) 25

26 36 25 89 37 102 99
25 38 20 88 54 92 87
13 38 16 80 58 77 75
22 43 0 85 64 52 86
25 48 26 78 62 50 100
32 60 46 70 60 36 100
26 47 61 74 71 71 84
23 a7 77 68 7 84 72
24 39 83 64 79 115 65
27 41 87 52 56 131 74
48 35 85 40 $5 150 80
47 35 77 40 61 152 79
40 35 77 40 41 140 71
56 37 60 33 22 130 63
53 29 44 46 7 122 75
62 22 28 25 0 105 68
65 20 16 38 0 90 70



MONTHLY MEAN SUNSPOT NUMBERS

Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

dan

Year

75.9 75.5 158.6 85.2
91.2 65.7 63.3 75.4

66.3
103.0

1749
1750

24.0
0.0

24.0 27.0 25.0
5.7 8.0 2.6

26.3
12.0

30.0
12.7

12.

29

39.0
12.0

1806
1807


1966
1966
1966
1966
1966
1966
1966

1967

DAILY SUNSPOT NUMBERS 1966

54 72 25
$3 68 18
48 60 26
46 50 30
58 33 36
68 13 38
60 13 39



DAILY SUNSPOT NUMBERS 1976

Year Day Jan Feb Mar Apr May dun dul Aug Sep Oct Nov Dec
1976 «01 0 0 23 30 0 10 7 30 0 0
1976 02 0 Q 23 23 0 16 20 28 Qo 0
1976 03 0 0 21 25 ie) I 17 12 30 0 0
1976 04 0 0 13 8 0 13 11 30 it) 0
1976 05 0 0 12 21 0 16 Vv 25 0 0
1976 06 0 10 9 10 0 l 14 10 24 it) 0
1976 07 0 12 0 10 it} 24 9 30 i) 7
1976 = 08 0 7 0 9 10 27 9 7 0 19
1976 09 0 10 8 8 10 31 18 14 i) 22
0 7 i) 19

0 7 0

0 8 0

8 ie)

te)

7

7

7

11

10

7

7

8

7

0

0

0

8 9

12 8
1977, 13 23 68 8 16 26 20 10 40 48 53 28 44
1977, 14 22 61 7 22 33 25 7 40 a7 48 31 37
1977) 15 24 45 0 29 26 8 0 42 53 54 39 41
1977 16 18 49 0 31 25 8 0 38 56 53 49 39
1977 17 30 47 8 32 20 8 0 36 53 51 $1 29
1977, 18 26 37 0 29 12 21 it) 40 60 50 54 33
1977, 19 7 25 0 22 0 33 7 35 59 54 $2 40
1977 20 te} 14 0 12 ll 21 8 33 60 54 38 23
1977) 21 15 9 0 20 14 28 8 33 58 42 32 23
1977 22 24 9 10 19 7 40 23 38 42 35 28 7
1977 23 34 9 9 18 7 57 30 15 4. 30 24 23
1977. 24 35 8 7 8 7 60 38 19 48 29 18 31
1977, 25 20 8 14 0 i) 74 42 25 46 28 10 35
1977 26 14 8 8 14 7 71 42 34 49 30 9 41
1977 27 0 0 9 8 13 74 37 38 54 38 14 50
1977. 28 13 0 16 11 16 65 26 36 61 37 9 45
1977 29 es 16 10 20 50 16 40 64 42 10 58
1977 30 8 8 9 30 45 10 36 60 45 23 64
1977) 31 10 8 40 8 31 52 67

100



DAILY SUNSPOT NUMBERS 1902

1902 O01 id) ie) 0 0 0 14 0 0 0 7 0 0
1902 02 0 0 10 0 0 7 i) 0 0 8 0 0
1902 03 0 0 25 0 i) 7 8 0 0 7 0 0
1902 04 0 0 27 0 0 7 7 0 ie} 0 le) 0
1902 05 15 le) 47 0 7 0 0 0 0 23 te) 0
1902 06 14 io) 50 0 0 0 to) 0 i) 30 QO 0
1902 07 16 0 56 0 to) 0 13 7 0 29 0 0
1902 08 13 0 47 0 to) 0 0 8 to} 29 0 0
1902 09 17 0 31 Qo 0 0 0 i) 0 32 0 lo}
1902 10 25 0 22 0 Q 0 0 0 0 19 0 ie)
1902 11 22 ie} pal 0 0 to) 0 0 0 18 0 Q
1902 12 14 0 7 0 0 0 0 0 ie) 11 0 0
1902 «13 13 ie) 7 0 0 0 i 0 0 8 ie} 0
1902-14 16 0 8 i) 0 0 0 7 0 7 10 0
1902.15 7 0 0 0 0 0 0 7 0 7 26 0
1902 16 0 0 7 0 0 0 Q 8 ie) 13 20 13
1902 17 i) io) 0 0 0 it) 0 11 i) 0 13 10
1902 18 0 0 0 to) 0 0 0 7 0 0 21 10
190219 0 0 0 ta) 0 ie} 0 0 12 ie) 24 0
1902 20 0 0 0 0 0 Q 0 ie} 7 8 32 0
1902 21 0 le) 0 0 9 0 0 0 20 7 40 i)
1902 22 0 to) 0 0 lv) 0 0 0 28 17 33 0
1902 23 io} 0 0 0 8 8 i) 0 29 28 26 0
1902 24 0 0 0 0 8 0 0 8 30 25 32 0
1902 25 0 0 0 0 7 0 0 i) 14 37 19 0
1902 26 0 0 0 0 7 i) 0 0 23 39 13 lo}
1902 27 0 0 ie) 0 7 0 0 0 19 22 0 0
1902 28 0 0 0 0 10 0 0 ie) 15 28 Q 0
1902 29 0 0 0 8 0 0 7 ll 23 0 0
1902 30 0 0 0 8 ie) 0 i) 10 16 0 QO
1902 31 0 0 8 0 0 7 0

63



mn

e0000

ar e
SCONSBOWNROODOCOO

BuSQeOCD0OM0

="

DAILY SUNSPOT NUMBERS 1914

0 0 0 8

i) 0 ie) 0 0

0 8 0 0 0
19 7 0 8 i 0 ie) v7 55
23 14 0 9 0 0 ie) 16 38
4 7 0 7 Q 0 0 12 27
23 7 0 7 0 ti) 0 33 28
21 Ly) 14 14 0 0 0 26 29
19 0 7 8 0 8 0 27 30
Vv 0 8 7 0 19 10 20 24
7 0 10 16 0 19 7 13 37
8 0 16 13 0 28 0 13 31
10 ti) 33 0 7 29 8 25 34
13 0 37 ie} 7 31 ie} 14 28
0 0 48 0 7 34 7 16 7
7 0 32 0 13 48 0 0 8
7 0 35 13 25 31 QO 0 16
8 ie} 26 9 23 30 0 9 15
23 0 31 0 22 21 8 9 14
22 0 23 0 26 16 13 8 7
7 9 16 0 7 8 23 14 9
19 19 8 7 19 7 10 19 8
uv il Q 0 20 0 12 14 10
8 8 0 ie) 16 7 10 27 13
14 i 0 0 7 7 v7 14 12
12 1) le} 0 4 7 ll 7 7
25 i? 0 QO 0 7 30 14 7
44 0 0 0 0 7 28 14 9
49 7 0 8 0 7 23 25 7
31 0 0 7 9 9 7 34 26
0 7 7 12 20





DAILY SUNSPOT NUMBERS 1970

1970 04 69 68 107 116 119 63 159 59 115 55 78 76
1970 05 66 72 107 120 113 59 165 65 120 75 67 88
1970 06 57 93 103 115 115 57 161 68 133 53 89 90
1970 07 30 104 11 123 98 58 125 72 136 72 86 91
1970 08 37 102 118 147 87 61 115 82 125 76 69 100
1970 609 59 123 120 172 90 60 104 76 116 78 77 96
1970 10 84 133 125 188 lll 92 30 71 103 79 78 110



280

240
200

160

120 \

404

EER ER URES MRR BRR EEES RRR REE ERRORS OBS BB SERE ORESSRESES GRMRESEEES CERRERERES RR RRRRERS RBRERREEAL

1700 1710 «©1720 «©1730 1740 1750 1760 1770 1780 1790 1800
280

240

200

160
120 i
a0 Af

404 f if
MI

0

1800 1810 1820 1830 1840 1850 1860 1870 1880 1890 1900

280

“ i
" CA
ml \ \

\

SURES DORR RE REE ESSER ORS ORR RRREREE ORRSRERSS RSERSESEAS RE RRUS BAAS ERERRBEEES LRSEBEEES

1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000

SMOOTHED MONTHLY SUNSPOT NUMBERS July 1749 - June 1985. Each smoothed number represents the average of
two adjacent 12-month running means of monthly means. Consider, for example, the June 1980 value. One
builds this number by first computing two 12-month means: one that averages monthly means from December
1979 through November 1980 and a second that averages monthly means from January 1980 through December
1980. The arithmetic mean of these two running means gives the June 1980 smoothed number.

Graph: Daniel C. Wilkinson
19



DAILY SUNSPOT NUMBERS 1872

Year Day Jan Feb Mar Apr May Jun dul Aug Sep Oct Nov Dec
1872 (Ol 37 113 129 136 103 157 124 79 73 175 67 120
1872 02 75 163 113 109 79 170 99 97 81 162 52 88
1872 03 48 151 127 102 87 136 100 141 84 139 66 85
1872 04 82 162 106 90 141 89 117 130 64 136 88 150
1872 (05 81 138 91 97 149 69 96 144 94 123 97 123
1872 06 101 148 55 97 130 58 93 142 91 135 93 110
1872 07 58 168 $1 91 147 79 100 142 129 131 97 91
1872 «©6008 84 148 52 91 93 123 124 126 124 79 117 136
1872 «09 73 154 36 85 102 127 130 145 144 67 133 110
1872 ©6110 74 145 41 71 31 97 196 148 163 79 136 90
1872) «11 82 134 22 90 73 174 172 66 136 109 174 97
1872 12 94 126 36 79 80 142 177 133 105 92 166 109
1872 13 106 96 49 114 54 139 169 130 141 103 174 90
1872) «14 99 97 33 96 75 130 132 94 118 83 117 85
1872 15 85 92 33 121 58 106 108 76 120 69 79 87
1872 16 99 52 33 102 73 106 82 72 129 105 124 67
1872 «17 97 85 34 129 76 85 78 63 118 112 112 97
1872 18 75 63 70 136 78 97 99 66 96 137 140 52
1872 19 70 69 90 136 88 106 93 60 149 97 133 79
1872 ©6020 88 $2 106 153 124 64 87 55 108 91 151 60
1872 21 96 76 124 76 110 106 84 79 91 87 117 53
1872 22 66 94 161 115 159 120 67 96 91 70 109 55
1872 23 69 100 153 115 148 106 91 66 85 72 120 29
1872 24 76 117 111 109 145 102 67 97 88 73 121 23
1872 25 $5 133 123 100 108 105 69 97 88 66 100 38
1872-26 55 148 118 85 109 72 70 79 154 127 112 67
1872 27 55 163 141 85 97 105 69 78 150 109 76 70
1872 28 $7 142 127 82 132 107 88 39 153 94 96 61
1872 29 90 154 127 93 157 106 75 33 132 91 96 83
1872 30 103 140 79 160 114 97 37 138 96 96 84
1872 31 135 109 169 117 70 72 111
Mean 79.5 120.1 88.4 102.1 107.6 109.9 105.5 92.9 114.6 102.6 112.0 83.9

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1873 Ol 161 89 100 79 90 97 76 76 82 67 16 16
1873 02 87 96 84 106 73 73 97 111 58 82 0 34
1873 03 117 112 96 88 87 90 78 109 42 73 21 49
1873 04 100 111 121 57 $5 75 94 88 42 81 37 38
1873 05 111 97 146 81 54 60 81 78 69 $5 52 54
1873 06 87 69 163 81 67 78 64 60 52 51 71 55
1873 07 69 69 166 52 67 70 60 76 45 69 58 60
1873 08 58 87 175 $1 34 52 37 $1 39 62 72 60
1873 09 41 99 139 67 34 36 39 36 43 62 93 56
1873 10 $1 83 121 70 36 36 19 36 37 $4 91 60
1873, li $1 135 115 97 52 16 34 19 18 37 91 63
1873, 12 85 97 124 104 33 0 34 19 16 36 73 63
1873 13 103 109 115 91 36 0 37 19 16 39 106 56
1873, 14 111 133 81 87 36 0 43 34 33 49 108 38
1873, 15 lil 84 82 82 34 0 36 $1 51 65 99 38
1873 16 92 112 49 76 16 io} 16 51 42 70 97 19
1873, 17 85 148 27 76 34 0 58 49 37 a7 85 19
1873 18 52 144 46 61 16 0 73 36 43 46 77 19
1873. 19 55 168 38 60 0 33 34 55 58 7 66 0
1873 20 63 121 60 16 0 51 18 75 51 ie} 60 40
1873 21 52 iil 73 34 0 34 37 75 54 16 71 40
1873, 22 55 109 73 69 0 34 37 75 39 16 54 38
1873 23 72 144 61 57 16 34 85 81 42 33 54 42
1873 24 73 138 81 81 36 $1 115 78 72 34 8 46
1873, 25 99 103 85 95 76 52 127 93 72 29 16 85
1873, 26 103 81 103 79 79 69 130 89 70 76 10 87
1873, 27 124 57 121 99 67 69 108 81 57 76 16 70
1873 28 96 90 102 99 64 67 142 97 40 64 10 85
1873 29 88 94 96 84 94 102 102 46 25 34 76
1873-30 81 91 94 120 73 75 96 48 22 16 67
1873, 31 154 115 118 87 118 7 51
Mean 86.7 107.0 98.3 76.2 47.9 44.8 66.9 68.2 47.1 47.1 55.4 49.2



DAILY SUNSPOT NUMBERS 1962

1963 18



DAILY SUNSPOT NUMBERS 1838

Year Day Jan Feb Mar Apr May dun Jul Aug Sep Oct Nov Dec
1838 (01 230 244 235 141 102 57 49 142 75
1838 02 227 134 132 7 85 69

1838 903 222 137 152 89 94 61 85

1838 04 219 59 195 162 46 106 74
1838 05 94 176 122 116 60 61 107 95 124
1838 06 7 99 110 60 67

1838 (07 72 126 100 101 117 70 76

1838 08 176 167 106 146 115 60 100 59 120

1838 09 64 139 115 129 92

1838 «10 79 121 80 145 116

1838 «(11 114 109 154 132 85 62
1838-12 77 137 175 97 66 46 81 106

183813 80 169 106 157 77

1838 «14 62 105 72 80 141 54

1838 «15 129 104 114 60 118

1838 16 101 170 ill 101 95 39

1838 17 34 186 142 124 96 109 72 61 32
1838 «18 115 34 7 129 97 132 105 126 20
1838 «19 35 106 121 95

1838 20 70 111 115

183821 89 81 97 150 54 76 $1
1838 8 =22 54 80 114 122 79 31 95
1838 23 57 132 85 144 77 101 29 77 94
1838 924 101 114 80 59 139 86 50 109 109
1838 925 161 107 35 30 81

1838 926 105 139 66 31 117 64 111
1838 27 156 32 35 67 105
1838 «628 84 216 132 $1 156 $1 115 64

1838 929 166 85 137 34 61

1839 (06 137 111 56 52 136 36

1839 07 42 62 SS 131 109 119

1839 08 120 46 77 67 144 157 91

1839 09 74 60 44 76 il 126 81 52
1839 = 10 47 89 71 65 96 121 104 82 102 85
183911 74 75 89 49 79 51 101 135 95 56
1839-12 91 137 57 60 94 57 89

1839 13 95 107 70 $5 141 106

1839 14 59 107 77 66 42 74 91 54 74

1839 «15 85 96 139 66 54 69 99 75 74

1839 16 84 65 31 71 75

183917 97 104 62 45 44 72

183918 77 a7 $1 127 106 97

1839 19 89 42 127 149 121 105 30
1839 20 94 57 60 60 116 181 129

1839 21 134 86 39 87 34 141

1839 22 125 46 30

1839-23 80 79 19 99 29 44
1839 «24 47 56 126 155 42

1839 25 150 46 71 157 124 46
1839 26 45 42 $1 142 160 29 87
1839 27 86 31 81 31

1839 28 79 24 32 239

1839 29 75 41 36 54 129 212 187 14 142



4
SMOOTHED MONTHLY MEAN SUNSPOT NUMBERS
1749 81.6 82.8 84,1 86.3 87.8 88.7
1750 89.0 90.2 92.3 92.6 88.2 83.8 83.3 81.8 78.6 75.4 72.9 69.6
1751 66.8 64.2 59.5 54.9 $1.7 49.0 46.2 45.0 46.4 47.5 47.6 47.1
1752 47.2 46.4 45.3 46.4 47.8 48.0 48.2 47.8 46.0 44.1 42.2 40.9
1753 38.2 36.2 36.7 35.8 34.2 32.1 28.8 25.8 22.8 19.9 18.3 17.4
1754 7.1 15.8 13.9 13.0 12.7 12.3 12.6 13.4 14.0 13.9 12.7 10.7
1755 9.2 8.4 8.4 8.8 8.5 8.9 9.7 9.6 9.4 9.4 10.1 11.1
1756 11.5 11.4 11.3 10.6 10.7 10.6 10.3 10.9 12.4 14.1 16.0 17.1
1757 18.0 20.7 23.8 25.7 28.4 31.4 33.4 35.7 37.9 40.6 42.7 44.4
1758 46.5 46.8 47.2 48.4 47.7 47,2 48.0 48.2 47.7 46.6 45.6 46.0
1759 46.5 48.1 50.1 51.5 $2.7 53.4 54.8 56.2 58.0 $9.6 61.1 62.0
1760 62.5 63.3 62.8 61.8 62.0 62.7 63.0 64.4 66.0 66.8 68.8 72.4
1761 75.7 77.5 79.8 83.0 85.9 86.5 84.8 82.9 80.7 78.8 75.5 71.7
1762 68.3 64.8 62.5 60.4 59.0 59.9 61.7 60.5 58.3 56.7 $5.3 53.2
1763 $2.4 §1.5 49.8 48.8 47.1 45.8 45.3 46.5 48.0 48.3 48.8 49.1
1764 47.8 46.9 45.4 43.0 40.8 37.8 34.9 32.0 29.9 28.8 27.3 25.8
1765 25.3 25.2 24.6 23.6 22.5 21.4 20.4 19.3 19.1 19.0 18.6 18.1
1766 16.4 14.4 12.8 12.0 11.2 11.2 12.1 13.5 14.5 15.9 17.2 18.6
1767 20.6 22.9 26.0 29.3 32.9 36.4 38.9 41.5 43.4 43.7 46.1 49.9
1768 53.0 55.4 57.8 60.6 63.5 67.4 70.7 71.5 72.1 75.1 77.2 77.8
1769 81.2 86.2 91.5 97.9 103.7 106.1 107.3 111.9 115.8 114.5 112.5 111.9
1770 111.1 110.9 109.3. 105.2 102.3. 101.2 98.0 91.1 85.7 84.9 88.9 93.9
1771 93.6 89.1 86.1 85.4 83.5 81.9 84.3 88.9 90.1 90.5 86.9 79.5
1772 77.3 77.6 75.4 72.8 70.7 67.8 64.6 60.1 58.3 56.7 54.3 53.3
1773 §0.0 46.1 43.5 40.4 37.4 35.6 34.5 35.6 37.3 38.0 38.9 39.3
1774 38.9 38.2 37.1 35.6 34.2 31.9 28.9 24.4 19.8 16.6 13.3 10.6
1775 9.3 8.6 8.5 7.9 7.5 7.2 77 8.9 9.2 9.4 10.2 10.7
1776 11.0 11.7 12.9 14.5 16.3 18.5 20.8 22.8 25.2 29.6 35.6 41.0
1777 47.5 55.1 62.9 70.3 78.1 87.6 98.0 106.6 113.6 119.6 128.2 138.6
1778 144.8 148.4 151.9 156.3 158.5 156.5 151.8 151.5 153.2 152.5 148.4 141.9
1779 139.0 137.5 133.8 129.9 127.0 125.7 124.1 119.4 115.7 112.8 109.4 106.9
1780 103.5 100.0 98.2 95.5 91.3 86.9 86.0 86.2 83.4 80.4 79.2 79.5
1781 79.4 78.0 75.4 71.5 69.8 69.1 66.2 62.8 60.6 58.8 55.6 $1.0
1782 47.0 44.5 42.9 42.0 40.4 38.7 37.4 36.3 36.0 35.0 33.2 31.3
1783 30.6 29.4 27.7 26.4 25.1 23.6 22.2 20.3 18.3 16.9 15.5 14.1
1784 12.3 10.8 10.0 9.7 9.8 10.0 9.9 9.6 9.5 9.7 10.5 11.9
1785 13.9 15.5 16.9 19.4 22.0 23.5 25.4 28.3 31.6 36.1 42.0 46.3
1786 49.6 $4.5 60.7 66.7 72.6 79.3 86.9 93.4 97.5 100.9 104.4 107.9
1787 111.4 115.3 119.2 123.0 125.9 129.5 132.2 133.3 136.6 138.0 136.4 137.8
1788 140.7 141.2 140.4 139.1 136.6 132.8 129.9 128.7 127.6 127.3 128.3 127.3
1789 124,9 122.5 119.9 116.5 116.0 117.9 117.7 117.3 116.4 114.2 111.7 109.2
1790 106.0 103.4 101.2 99.6 97.2 92.5 88.6 84.6 81.0 79.4 77.8 75.9
1791 74.9 73.1 70.8 69.4 67.9 66.9 66.0 65.4 65.1 64.5 64.0 63.4
1792 62.2 61.9 62.2 61.8 61.3 60.5 60.0 59.5 58.8 57.6 56.2 55.4
1793 55.1 54.0 51.3 49.3 48.3 47.3 46.4 45.5 44.3 42.6 41.7 41.4
1794 40.7 40.7 40.7 39.3 39.6 40.8 40.0 38.9 37.6 36.2 34.7 32.7
1795 30.5 28.7 28.2 28.0 25.8 22.7 21.3 20.6 20.1 20.8 20.9 20.1
1796 20.2 19.8 19.0 18.8 17.8 16.6 15.7 14.6 13.3 11.6 9.9 9.5
1797 8.8 8.0 7.7 7.0 6.7 6.5 5.9 5.4 5.7 5.9 5.5 4.7
1798 4.1 3.8 3.5 3.2 3.2 3.8 4.1 4.4 5.1 5.8 6.5 7.3
1799 7.8 7.8 7.5 7.6 7.3 6.8 7.0 71 6.6 5.9 5.4 5.9
1800 7.2 8.8 10.1 10.9 11.5 13.2 15.3 17.0 18.5 20.4 22.8 24.3
1801 25.2 26.6 28.3 30.0 32.1 33.7 34.9 36.5 37.7 38.6 39.6 40.7
1802 41.8 42.8 44.1 45.1 45.1 45.0 45.1 45.4 45.1 43.9 43.2 42.8
1803 42.4 41.7 40.8 41.2 42.5 43.1 42.9 42.6 43.2 45.1 45.7 45.2
1804 44.3 44.0 44.6 45.3 46.1 47.0 48.1 48.6 48.6 48.2 47.9 48.3
1805 48.9 49.2 48.8 47.1 44.9 43.1 41.3 39.8 38.4 37.2 36.3 35.2
1806 34.2 33.2 31.7 30.7 30.0 28.7 27.0 25.1 23.0 22.3 21.5 20.2
1807 18.9 17.6 16.3 14.7 13.0 11.1 9.6 8.7 8.0 7.1 6.8 7.0
15



DAILY SUNSPOT NUMBERS 1894



UAG-91

UAG-92

UAG-93

UAG-94

UAG-95

UAG SERIES OF REPORTS (Continued)

COMBINED CATALOG OF IONOSPHERE VERTICAL SOUNDINGS DATA, compiled by Raymond 0. Conkright and
Marcus 0. Ertle, National Geophysical Data Center, NOAA, Boulder, CO, December 1984, 174 pp.

INTERNATIONAL CATALOG OF GEOMAGNETIC DATA, compiled by C.C. Abston, National Geophysical Data
Center, NOAA, Boulder, CO; N.E. Papitashvili, Academy of Sciences of the USSR, World Data Center
B2, Moscow, USSR; and V.0. Papitashvili, IZMIRAN, Moscow Region, USSR, August 1985, 291 pp.
Supersedes UAG-35, 49, and 86

IONOGRAM ANALYSIS WITH THE GENERALISED PROGRAM POLAN, by J.€. Titheridge, University of Auck-
land, New Zealand, December 1985, 194 pp.

THE SOLAR MAGNETIC FIELD--1976 THROUGH 1985: AN ATLAS OF PHOTOSPHERIC MAGNETIC FIELD OBSERVA-
TIONS AND COMPUTED CORONAL MAGNETIC FIELDS FROM THE JOHN M. WILCOX SOLAR OBSERVATORY AT STAN-
FORD, by J. Todd Hoeksema and Philip H. Scherrer, Center for Space Science and Astrophysics,
Stanford University, Stanford, CA, January 1986, 370 pp, $9.00

SUNSPOT NUMBERS: 1610-1985, (based on THE SUNSPOT-ACTIVITY IN THE YEARS 1610-1960, by Prof. M.
Waldmeier, Copyright 1961, Swiss Federal Observatory, Zurich, Switzerland), revised by John A.
McKinnon, National Geophysical Data Center, NOAA, Boulder, CO, January 1987, 112 pp, $10.00.

U.S. GOVERNMENT PRINTING OFFICE: 1987-77 3 -041 /noo01

112



VARIATIONS IN THE MEASUREMENT

Sunspot counts are an estimate, not a quantitative measurement, because different
equipment, different observer experience, and different observing conditions all af-
fect the result.

Equipment. Under the same observing conditions, the number of spot groups and
the number of individual spots recognized depend on the magnifying power of the tel-
escope. Rudolph Wolf observed through a Fraunhofer refractor of 8 cm aperture, of
64x magnification, of 8 cm aperture, and of 110 cm focal jength.

Personal Judgment. Even when different observers use identical instruments, dif-
ferent counts of the number of groups and of the number of spots emerge for several
reasons, One person, for example, will count very small spots; another will consid-
er them to be only pores; and still a third will fail to see them at all. Each ob-
server sets a different threshold between what to count as spots and what to count
as pores. [Pores are smaller, brighter, shorter-lived features than spots, and they
should not be included in the count, yet many observers underestimate the number of
spots, because they define any spot without a penumbra to be a pore.] Some persons
also consider large spots to be composed of many individual ones, while others count
isolated parts of a penumbra as spots. Finally, if large clusters of spots appear,
observers often disagree on the way in which they should be grouped.

Seeing. The sunspot count depends strongly not only on the person and his in-
strument but also on the stability of the atmosphere above the observing site. In
other words, the count depends on the seeing conditions--those constant, turbulent
motions of the air around and above a telescope that blur an image. If the seeing
worsens, very small spots disappear, reducing the total count. If these smail spots
happen to be isolated ones, then the number of groups counted decreases too.

. : Differences between an observer's
Souwousfleclion Ce iis judgment, equipment, and seeing con-
{ditions and those of Wolf in 1848
§ fal are taken into account by a scaling
& 4 " factor or observatory constant, K.
4 ie |K is determined for a new station by
gets: - = calculating the ratio of the sum of
Mig 4g the counts from the new site to the
b Px ny _|sum of the counts from the old one.
2 |K measures the relative difference
7 Mae. gMae |between the sunspot numbers recorded

: oy jat the two stations. Multiplying
: *% a y me ot: "raw" observations by K adjusts them
{ , = to values that approximate what Wolf

Rc haguet: thee thug, — Ub Auguet Seeapue. himself would have recorded.

Since the last century, Wolf sun-

d ae B oalig| spot counts have shown no seasonal
es nee 4 periodicity, the reduction factors K
Bint + Wipe: Se sd of all contributors have remained
‘ ; unchanged, and the proportionality
_j between sunspot area and sunspot

number has shown little variation.

All three conditions suggest that

(since 1848) this long-term series

Evolution within selected sunspot groups in 1848. wolf's jOf numbers has remained consistent

detailed daily drawings show umbrae as well as penumbrae. |and homogeneous and close to Wolf's
- original scale.

EIDGENOSSISCHE TECHNISCHE HOCHSCHULE-Zentrum, Zurich

~



1958
1958
1958
1958
1958

91



DAILY SUNSPOT NUMBERS 1848

164

161

97
150

155

109

72
145
112

129
132

11

116
110
109

187
196
181
152
155
130

129

157

106
134

146
135

187

177
117

92
110
105

107
100

99
170

204
195

87
67

70
104

96.2

102.5



DAILY SUNSPOT NUMBERS 1972



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