Publication Notice

WORLD DATA CENTER A for SOLAR-TERRESTRIAL PHYSICS REPORT UAG
(Prepared by World Data Center A for Solar-Terrestrial Physics, NOAA, Boulder, Colorado)

These reports are for sale through the Superintendent of Documents, Government Printing Office, Washington, D. C. 20402.
Subscription price: $9.00 a year; $2.50 additional for foreign mailing; single copy price varies. These reports are issued on
an irregular basis with 6 to 12 reports being issued each year. Therefore, in some years the single copy rate will be less
than the subscription price, and in some years the single copy rate will be more than the subscription price. Checks and money
orders should be made payable to the Superintendent of Documents.

Upper Atmosphere Geophysics Report UAG-1, "IQSY Night Airglow Data" by L. L. Smith, F. E, Roach and J. M. McKennan
of Aeronomy Laboratory, ESSA Research Laboratories, July 1968, single copy price $1.75. [Catalog No. C52.16/2:1]

Upper Atmosphere Geophysics Report UAG-2, "A Reevaluation of Solar Flares, 1964-1966" by Helen W. Dodson and E. Ruth
Hedeman of McMath-Hulbert Observatory, The University of Michigan, August 1968, single copy price 30 cents. [Catalog
No. €52.16/2:2]

Upper Atmosphere Geophysics Report UAG-3, "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, Department of Astro-Geophysics, University
of Colorado, October 1968, single copy price 30 cents [Catalog No. C52.16/

Upper Atmosphere Geophysics Report UAG-4, "Abbreviated Calendar Record 1966-1967" by J, Virginia Lincoln, Hope I. Leighton
and Dorothy K. Kropp, Aeronomy and Space Data Center, Space Disturbances Laboratory, ESSA Research Laboratories, January
1969, single copy price $1.25. [Catalog No. C52.16/2:4]

Upper Atmosphere Geophysics Report UAG-5, "Data on Solar Event of May 23, 1967 and its Geophysical Effects" compiled
by J. Virginia Lincoln, World Data Center A, Upper Atmosphere Geophysics, ESSA, February 1969, single copy price 65
cents. [Catalog No. C52.16/2:5]

Upper Atmosphere Geophysics Report UAG-6, "International Geophysical Calendars 1957-1969" by A. H. Shapley and J.
Virginia Lincoln, ESSA Research Laboratories, March 1969, single copy price 30 cents. [Catalog No. C52.16/2:6]

Upper Atmosphere Geophysics Report UAG-7, "Observations of the Solar Electron Corona: February 1964~January 1968"
by Richard T. Hansen, High Altitude Observatory, Boulder, Colorado and Kamuela, Hawaii, October 1969, single copy
price 15 cents. [Catalog No. 052.16/2:7]

Upper Atmosphere Geophysics Report UAG-8, "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, March 1970, single
copy price (includes Parts 1 and 2) $1.75. Part 1 [Catalog No. C52.16/2:8/1], Part 2 [Catalog No. C52.16/2:8/2]

Upper Atmosphere Geophysics Report UAG-9, "Data on Cosmic Ray Event of November 18, 1968 and Associated Phenomena”
compiled by J. Virginia Lincoln, World Data Center A, Upper Atmosphere Geophysics, ESSA, April 1970, single copy
price 55 cents. [Catalog No. C52,.16/2:9]

Upper Atmosphere Geophysics Report UAG-10, "Atlas of Ionograms" edited by A. H. Shapley, ESSA Research Laboratories,
May 1970, singlé copy price $1.50 [Catalog No. €52.16/2:10]

Upper Atmosphere Geophysics Report UAG-11, "Catalogue of Data on Solar-Terrestrial Physics",
compiled by J. Virginia Lincoln and H. Patricia Smith, World Data Center A, Upper Atmosphere Geophysics, ESSA,
June 1970, single copy price $1.50. [Catalog No. C52,16/2:11]

Upper Atmosphere Geophysics Report UAG-12, "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
Atmosphere Geophysics, NOAA, April 1971, single copy price (includes Parts 1-3) $3.00. [Catalog NO. C55.220:12/

Pt 1, Pt 2, Pt 3]

Upper Atmosphere Geophysics Report UAG-13, "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, NOAA, May 1971, single copy price 50 cents. [Catalog No. C55.220:13]

Upper Atmosphere Geophysics Report UAG-14, "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, July
1971, single copy price 30 cents. [Catalog No. C55.220:14]

Upper Atmosphere Geophysics Report UAG-15, "Catalogue of Data on Solar-Terrestrial Physics", prepared by Research
Laboratories, NOAA, Boulder, Colorado, July 1971, single copy price $1.50. (Supersedes Report UAG~11, June 1970.)
[Catalog No. C55.220:15]

Upper Atmosphere Geophysics Report UAG-16, "Temporal Development of the Geographical Distribution of Auroral Absorp-
tion for 30 Substorm Events in each of IQS¥ (1964-65) and LASY (1969)" by F. T. Berkey, V. M. Driatskiy, K. Henriksen,
D. H. Jelly, T. I. Shchuka, A. Theander and J. Yliniemi, September 1971, single copy price 70 cents. [Catalog No.
55.220:16]

Upper Atmosphere Geophysics Report UAG-17, "Ionospheric Drift Velocity Measurements at Jicamarca, Peru (July 1967 -
March 1970)", by Ben B. Balsley, Aeronomy Laboratory, National Oceanic and Atmospheric Administration, Boulder,
Colorado, and Ronald F. Woodman, Jicamarca Radar Observatory, Instituto Geofisico del Perd, Lima, Peru, October 1971,
single copy price 35 cents. [Catalog No. C55.220:17]

Upper Atmosphere Geophysics Report UAG-18, "A Study of Polar Cap and Auroral Zone Magnetic Variations", by K. Kawasaki
and S. I. Akasofu, Geophysical Institute, University of Alaska, June 1972, single copy price 20 cents. [Catalog
No. C55.220:18]

USCONM-NOAA-ASHEVILLE, NC~6-23-72--1200



Aug

Aug
Aug
Aug
Aug
Aug
Aug

Aug
Aug
Aug
Aug
Aug

Aug
Aug
Aug
Aug
Aug
Aug
Aug
Aug
Aug
Aug
Aug
Aug

Aug
Aug
Aug
Aug
Aug
Aug
Aug
Sept
Sept
Sept
Sept
Sept
Sept
Sept
Sept

Sept
Sept
Sept

McMath-Hulbert Observatory Finding List of Flares of Importance = 1, 1967

End
UT

(p50

(

(

(

(

(

(

Max.
UT

0930
0139

1515
2358
1449

1830
1610
0712
2145
1214
2106
0046

2026
2100
2138
2405
0530
0735
0026
0037
1615
0110
1844
0206

2204.

0029
0053
0154
1429
1418
0023
0947
2111

1214
1404
1414

1335
1948
2053
0030
0503
0827
0231

2040
1039
2015
0650

1215
1318,
0359
2344
2225

)

ie30)

1988)

)

z160\

)

)

IMP.

POSITION

N27

N28
N20
N31
N20
$23
N25
S24

S24
$23
$23
$22
NO9
NOs
N24

N25
N26
N16
N16
N20
N22

N18
NIS
N23
N22
N22

N23
N24
N26
N25
N19
$20
S19
N22
N13
N17
$20
$22

N22
N22
N22
N22
N22
N24
N18
N13
N23
N27
N25
$19
$20
N12
N25

N15
N16
N17

Table 1 (continued)

W85

W76
E76
W87
W64
E75
W38
E32

WO6
Wa
W28
W77
wis
W17
E87

E89
£90
E80
E85
£83
E79

E64
E54
E48
£52
E42

E36
£20
E21
E22
E20
£07

00
WO5
WO6
wil
W32
W32

W45
w46
W50
W50
W52
W53
W68
W84
W85
E23
£08
E79
E63
E70
W33

E61
W60
wW17

10

INDIVIDUAL STATION IMPORTANCE RATING

2b 2n 1b In 1n In 1n0

lb
Ib
Sn
lf
Sn

1b
In

2b
2b
In
In

In

if
Sn
2n

In
Sn

oo

in

1n
1b
Sn
Sn

1b
In
2b
Sb

0

Sb
In
if

In Sb 0

Sn 0

lf if 1f 0 0
2n 1b In 1f SnO

In In Sn Sf 0

co

In In 1f Sn
In In In

Sn Sf 0

In

Sb Sf Sf

1b 1b in 1n In In

2b 2f 1b 1b
Sf

Sb Sn
1f 0
1f Sb

|
|
|



Reevaluation of Solar Flares
1967

Helen W. Dodson and E. Ruth Hedeman
McMath-Hulbert Observatory
The University of Michigan

and

Marta Rovira de Miceli*
San Miguel Observatory
Argentina

Introduction

Several years ago an effort was made to remove certain apparently serious inhomogeneities from
world-wide solar flare data [Dodson and Hedeman, 1968; Michard et al., 1970]. The principal fault
was a systematic relationship between the number of reported flares of importance =1 and time in the
Universal Day. Specifically, for the years 1964-66, a very high maximum existed in the number of
flares evaluated as of importance 21 between approximately 0700 and 1000 UT. See Figure 1A. It
had been known for a number of years that an inhomogeneity of this type existed in world-wide flare
lists [Dodson and Hedeman, 1960]. Over the years, genuine efforts had been made to reduce these
faults at the observing level but the efforts apparently were not successful. Therefore, for the
years of IQSY (1964-65) and for 1966 an actual reevaluation of Quarterly Bulletin data was under-
taken.

Reevaluation, 1964-1966

In the reevaluation of the 1964-66 flares, the importance of each event was judged by giving
consideration to the full information represented by the total Ha patrol data of the more than 45
observing stations. For example, if.a station indicated that it was patrolling at the time of a
supposed flare of importance 21, but failed to report either flare or subflare for the time in

uestion, the event was considered to be a flare of “importance 0" for the station in question
res "negative report" in the current terminology of the Quarterly Bulletin). In the hope of separat-
ing the bona fide flares of importance 21 from the many subflares, it was required that at least
half of the stations conducting patrols near the time of supposed start and maximum of the event,
report a flare of importance =1, in order for the event to be included in the Finding List of

Flares of Importance 21. The results of the reevaluation for 1964-66 were published by World Data
Center A for Solar-Terrestrial Physics in Report UAG-2 [Dodson and Hedeman, 1968], and are summarized
in Figure 1B.

Quarterly Bulletin Data, 1968-1970

After studying and checking the above results, World Data Center B for Solar Activity at Meudon,
adopted a system of "filtering" of flare-reports as part of the preparation of flare-data for the
Quarterly Bulletin on Solar Activity. These techniques were applied to flare-data beginning in
danuary 1968. The distributions of flares of importance 21 in the Quarterly Bulletins for 1968-70
are shown in Figure 2. It is clear that the longstanding peak in flare counts centered at ~0800 UT
has been eliminated from the Quarterly Bulletin data in these years.

1967 Flare Data and Reevaluation

In solar cycle 20 (to date), it 4s only for 1967 that gross inhomogeneities of the type here
described still remain in all currently available flare data. The extent of the problem in 1967 is
evident from the diagram in Figure 3A. In this year, two to three times as many flares per hour
were reported as of importance 21 from 0600 to 1400 UT as during the remainder of the Universal Day.
Accordingly, to bring all flare data for cycle 20 to a reasonably common basis, a reevaluation of
flares in 1967 has been carried out at the McMath-Hulbert Observatory using the methods developed
for the 1964-66 flare lists. Table 1 of this report presents the resultant Finding List of Flares
of Importance =1, 1967. The distribution of these flares as a function of Universal Time is shown
in Figure 3B. “The broad high maximum from 0600 to 1400 UT of the original data no longer appears.
The total number of flares of importance =1 has been reduced from 1189 to 523. In this Finding List
a question mark has been placed beside the importance evaluation for all flares that occurred when
only one station was observing the sun, or for which the importance evaluation still remains ambig-
uous. The latter are cases for which the evaluations "subflare" or "zero" equal in number the re-
ports of “importance 21."

* Visiting Astronomer, McMath-Hulbert Observatory
1

|


By combining the data from the reev
Bulletin data for 1968 onward, it becomes possible to pre
neous flare events, month by month, throughout the development of solar cyc

Table 3 and Figure 4.

According to these

follows: March 1966; March 1967; January,

February and March 1970.

data,

the months with the highest number of flares of importance =1 were as
February and October 1968; May and November 1969; and
The highest frequency of flares of importance =2 took place in March 1966,

aluations for 1964-66 and 1967 with the "filtered" Quarterly
pare counts and plots of relatively homoge-
le 20 (to 1971).

February and May 1967, November 1969 and March 1970.

August 1970 is conspicuous and sharp.

Table 3

See

The drop in flare-occurrence beginning in

Number of Flares of Importance $1, by Months,
1964-1971 (September) after Reevaluation or

Filtering of Reports

Number of Flares
Month [ Imp.51 Imp.52 Imp.51 _Imp.52 Imp.51__Imp.52
1964 1967 1970
Jan. 1 1 54 6 61 6
Feb. 1 - 57 12 82 5
Mar. 1 - 67 6 98 13
Apr 2 1 36 2 56 2
May L - 4l 12 57 4
June 1 - 24 2 71 7
July - 7 55 2 53 1
Aug. 1 - 50 7 21 1
Sept - - 16 2 23 2
Oct. 2 - 39 4 32 4
Nov. 2 - 30 4 48 6
Dec 1 - 54 6 35 1
1965 1968 1971
Jan. 3 - 78 9 22 2
Feb 4 1 69 2 wv 3
Mar. 5 - 22 1 7 -
Apr. 5 - 10 - 23 2
May 16 - 27 - 11 2
June 12 2 44 3 10 -
July 5 - 32 6 15 1
Aug. 1 - 53 6 31 2
Sept. 5 1 53 4 15 -
Oct. 13 2 75 10
Nov. 9 - 49 5
Dec. 10 - 57 5
1966 1969
Jan. 8 2 50 2
Feb. 9 - 41 6
Mar. 61 14 63 6
Apr. 25 3 53 7
May 10 2 75 5
June 7 1 48 10
July 31 5 35 2
Aug. 33 6 41 1
Sept. 25 8 47 4
Oct. “22 3 43 3
Nov. 14 1 83 14
Dec. 45 5 52 4



Date Begin
UT
1967 (continued)
Mar 3 0621
Mar 3 0900
Mar = 3 0944
Mar 3 2137
Mar 3 2303
Mar = 4 = 0624
Mar 4 0718
Mar = 4 = 0824
Mar 4 1321
Mar 4 1425
Mar 4 1716
Mar 4 1910
Mar 4 2102
Mar 5 1006
Mar 6 0918
Mar 6 1308
Mar 6 2255
Mar 8 2214
Mar 9 1015
Mar 12 1236
Mar 15 2051
Mar 16 ©2342
Mar 17 2152
Mar 18 0835
Mar 19 0244
Mar 20 0850
Mar 20 2310
Mar 21 1814
Mar 21 1825
Mar 22 0022
Mar 23 1917
Mar 23 2328
Mar 25 0709
Mar 25 1856
Mar 25 2151
Mar 26 0458
Mar 26 0649
Mar 26 0651
Mar 26 1402
Mar 26 1448
Mar 26 1603
Mar 26 1630
Mar 27 1444
Mar 27 = 1558
Mar 27 1718
Mar 27 2107
Mar 28 0615
Mar 28 1732
Mar 28 1909
Mar 29 1726
Mar 30 ©0756
Mar 30 ©0851
Mar 30 1143
Mar 30 ©2336
Mar 31 = 0351
Mar 31 1158
Mar 31 = 1258
Mar 31 = 1333
Mar 31 = 1622

Table 1 (continued)

McMath-Hulbert Observatory Finding List of Flares of Importance 21, 1967

End
UT

(

(

(

(

Max.
UT

0630
0903
0949
2141
2309

0725
0831
1326
1428
1717
1723
1922
2108
1015
0920
1316
2311
2232
1019
1029
1239
2056

2202
0853
0252
0904
2345
1820
1832
0033
0155
1932
2332

1914
2203
0509
0706
0703

1451
1605
1652
1454
1614
1730
2113
2129
0618
1740
1916
1740
0800
0902
1149

0412
1204
1305
1336

)

)

)

)

IMP.

POSITION

N23
N16
S21
N20
N23
N20
N22
N21
$18
N21
N24

$22
S24
N24
N17
N17
N17
S22
N24

N15
S17
N18
N24
$15
N23
N18
N23
N20
N25
N24

N24
N25
N23
N26
N23
N23
N24
$20
S19
N21
N24
N26
N23
N24
N25
N23

N24
N23
N25
N21
N22
N24
N22
N24
N25
N25
N18
S22
N23

w49
w20
E24
W68
w72
W78,
W76
W78
E68
w80
W68

E06
E03
ws80
W73
E32
£08
W50
wo4

W63
E36
E79
E53
£08
E36
E90
E21
E77
E58
E68

E31
E44
E26
E20
EOL
WO1
waz
E71
E67
wos
£02
E05
WO5
WO6
W23
w24

w29
W37
W33
W30
w40
w49
wa
W59
W63
E40
W32
W60
W68

INDIVIDUAL STATION IMPORTANCE RATINGS

2b
1b
In

1b
1b
In
In

In
1b
2n
1b
In
Ib

ln
1b
In
In
2b
In
1f
in

ln
Sb
In
Sn

1f

Sn
Sf
In
1b
Sn

In
In
if

In
In

Sn

Sb
Sf

Sb
In
2n
1b

lf

1b In

In Sn
in Sb Sn
Sn Sn 0

0 0

Ind 0
Sb Sn
sfo0 00

Sn Sn 0

1f Sn Sf
Sb Sb Sn
Sb Sn 0

In 1f Sn Sn Sn 0
2n 2n 2n lb Ind 0 0
0

|


|
|

NUMBER
100-
90-
80-
70-
60-

A 50-
40-
30-
20-
10-
o-

QUARTERLY
BULLETINS
1967

oh 4h gh tah teh 20h UT.

FINDING LIST
30-
20-
B io.

o-

oh 4h gh jah ish 20h ut

Fig. 3. Number of flares, importance =1, 1967, according
to Universal Time of start or of first observa-
tion.

A. Quarterly Bulletins on Solar Activity
B. Finding List of Flares.

The shaded areas indicate flares of importance 22.



"Z= aourquodw Jo sauely ayedLpuL seaue papeys ayL

“0261 -896T

*UOLJEAUSGO YSULJ JO AO 4UeIS JO SUL]

Lesuaalun 07 Bulpuosoe ‘T= adueqvoduit
*sulqa_ing ALwaquend ay. UL seue{s Jo uaquinn *Z “BL4

LN OS yo! 1 y8 yb 0
-0
-0l
-02
-0¢
SNIL3TING -OF
ATYILYVNO -0¢

BOA ALE ae -O

-O1

-02

6961 -0¢

SNIL3TING -Ob

ATY3LYVND -0S

a a a ce LA

a j 0
-01

-02

-0O¢

896) -op

SNIL3TING -0¢

ATYSLYVNO UaSWNN

"Zz aourzuodul JO Saves aIVOLpUL seaue papeYys ay]
seve[j $0 S17 Bulpuly *g
AYLALQOY 4ueLOS uo sULaLiNg AMaquenh “y
*uoLzeAUaSqo ISALs JO
4O YARIS JO SUL] LBSUeALUN 07 BuLpsoooe
*Q96I-P96T ‘I= aouURZUOdW, ‘Saue_y Jo waqunn “T “BLy

-0l
-02
g

4SI7 SNIONIS 70€
YSN

eet -0

Z -01

-02
-0€
-0v
-og
-09

OL
-08
-06
-00!
-Oll

-0¢!
YaaWnN

99 - 796I
SNIL3TING
AWWILYVND

er re Cr LA Lo x


NUMBER

100-
90-
80-
70-
60-
50-
40-
30-
20-
10-
o-

Fig. 4.

Acknowledgements

NUMBER OF FLARES OF IMPORTANCE 2 !

BY MONTH

G@ IMPORTANCE > 2

1965

1966 1967 1968 1969 1970 1971

Number of flares of importance =1, by months, 1964-1971, after
reevaluation or filtering of reports.

Black areas indicate flares of importance = 2

We want to thank Miss J. Virginia Lincoln and her colleagues at World Data Center A for Solar-
Terrestrial Physics for sharing with us their records of Ho patrol times in 1967. Their help in the

publication of this report also is appreciated. We gratefully acknowledge the support of NASA Grant
NGL-23-005-275 in the preparation of this study.

DODSON, H. W. and
E. R. HEDEMAN

DODSON, H. W. and
E. R. HEDEMAN

MICHARD, R.,
H. W. DODSON and
E. R. HEDEMAN

1960

1968

1970

REFERENCES

Survey of Number of Solar Flares Observed during the

International Geophysical Year, J. Geophys. Res., 65, 123.

A Reevaluation of Solar Flares, 1964-1966, Report UAG-2,

World Data Center A, ESSA, Boulder, Colorado, August 1968.

IQSY Data Review: Solar Activity, Annals of the IQsY,
6, 187.

15

|
|
|
|

|
|
|
i
|
|
|
i
|



Table 1 (continued)
McMath-Hulbert Observatory Finding List of Flares of Importance 21, 1967

Date Begin End Max. IMP. POSITION INDIVIDUAL STATION IMPORTANCE RATINGS
UT UT UT

1967 (continued)
Feb 5 1430 1520 In? S25 WO2 in 0
Feb 6 1825 1915 1849 2n N26 E85 2n 2n 1b Sf

|

t
Feb 2022 2045 2030 In N20 E81 In 1f |
Feb 0130 153 0137. 1b N18 E34 1b 1b In |
Feb 0624 1640 0630 = In N18 E32 lb 1f 0 |
Feb 0720 755 1f? N16 E30 2f0 0 |
Feb 1025 1125 1037 1b N18 E30 2b In 0 I
Feb 1136 1212 2n? N18 E74 2n 0 |

Feb 114 1223 ln? N13 E10 ind

6

7

7

7

7

7

7

7

8 t
Feb 8 233 2303 2242 «1f N13 W63 In lf 1f 0 |

12

13

13

15

16

Feb 1255 1333 2f? N17 E73 2f
Feb 0840 0935 In N12 WOS 2n 1b 1b 1n 1n Sn
Feb 1233 1330 1245 In N15 E29 2f 2f In 1n In |
Feb 1747 2130 1820 3b N21 W11 4b 3b 3b 3b 2b 2f |
Feb 2214 2230 1n? N18 W85 1b In Sn Sn
Feb 303 350 2309 In N14 E67 In In
Feb 220 2240 (3285) 1n? N29 E61 In Sf
2225

Feb 17 1936 1950 1941 1b N25 E65 1b 1b 1n Sb
Feb 17 2212 2230 2217 1b N24 E56 1b 1b Sb
Feb 18 0943 1200 1035 = 3n N22 E55 4n 4n 4n 3b 2n 2n 2n 1n 0
Feb 20 1631 1648 1637 1n? N22 E90 In
Feb 21 250 313 0300. 1b? N23 E82 1b Ib In SbO 0
Feb 21 0628 0747 (9838) In N25 E80 In In 1f Sb Sb
0715
609 1617 1609 In N25 E70 1b 1n In Sn
501 517 0510 1b N24 E61 1b 1b 1b In

Feb 21 1
Feb 22 0
Feb 22 0621 0633 0625 2n N24 E66 2b 2n 2f Ib
Feb 22 1916 0955 (3538) ln? N23 E87 3n 2b In 0

0928
Feb 22 1232

In? N25 E63 in 0

Feb 24 0607 0739 0617 in? N23 E40 2n 2n In Sn 0
Feb 24 1900 1940 1906 1b N24 E29 2b 1b 1b In In
Feb 24 2303 2357 2334 = 1b? N19 E38 1b 0
Feb 25 0735 0850 1b N24 E24 1b 1b lb In Sn0 0
Feb 25 1309 1405 In N25 E26 1b 1n In 1f Sf 0
Feb 25 1806 1830 1810 1b N27 £13 1b 1b In Sn
Feb 25 1848 2015 (isse) 1b N26 E25 2b 1b In Sn
1956.
Feb 26 0855 0930 0905 = In N26 E19 1b 1b 1n In in In Sb Sb Sn 0
Feb 27 1637 1830 1644 2n N27 E02 2b 2n in
Feb 27 2048 2240 (330) Ib N23 WO6 2n 1b

|

|

Feb 22 1325 1b? N23 E58 1b 0 |

Feb 22 1401 1535 (1038) 1b N26 E62 2b 2n 1b 1f Sn t

1455 |

Feb 22 1440 1604 In N23 WO1 2b 2b In 1f 0 |

Feb 22 1807 1954 (1823) 2b N25 E63 2b 2b 2b 2b 2n |
1850

Feb 22 2310 2359 1f? N25 E56 2f Sn 0 |

Feb 23 0828 0848 2b? N24 E44 3b 3b 1b i

Feb 23 1143 1218 1150 2n? N24 E51 3b 2f 0 |

Feb 23 1417 1445 In N24 E49 In In 0 |

Feb 23 1609 1659 (1836) 1b? N24 E40 1b In Sb 0 |

1630 t

i

2129
Feb 28 1600 1631 In N28 WO9 1b in 1n Sb
Feb 28 2020 125 In? N17 E13 2n Sb Sn
Mar 1 0416 0449 (3420) 1b N17 E12 2b 1b Sb
0430
Mar 2 0442 0505 1b N26 W35 1b 1b 1b Sb
Mar 2 1010 1032 1011 In N19 E90 2n 1b In SnO O
Mar 2 1108 1123 In N27 W37 1b In in Sn Sn
Mar 2 1543 1627 1553 In N29 W38 2n 2n 1b 1b 1n In Sf

|
|
|


WORLD DATA CENTER A

for
Solar-Terrestrial Physics

REPORT UAG-19

REEVALUATION OF SOLAR FLARES

1967
TAI

June 1972



May

dune
dune
dune
dune
dune
June

dune
dune
dune
dune
dune

dune
dune
dune
dune
dune
dune
dune
dune

dune

dune
dune
dune
June
duly
duly
duly
July
duly
July

Table 1 (continued)

McMath-Hulbert Observatory Finding List of Flares of Importance =1, 1967

Begin
UT

End Max.
UT UT

1302
1539
1926
2411
1814
1844
1947
0321

0646
1053
2054

0207
0904
1238

(1285
1555
0003
0203
(i338
1235

0035
0543
0820 (R785

0750

151 1457
1554
0105
0832
092 0852
1732 (183

1710
2345 2306
035; 0304

0758
2032 (18%

1938
1218
1115
040 0026
2221 2125
215 0126
1415 1315
1554
1410 (38

1354
O11 (ose

0052
00 0135
2013
0100
2339

1707
0946

1015
1855

)
)

)

)

)

)
)

IMP.

POSITION

N26
N23
N24
N24
N29
N27
N28
N22
$20
N28
N22
N27
N26
N14
N19
N30
N30
N30

N24
N26
N12

N26
N28
N28
N24

N30
N24
N21
N21
N10
N20
N24

N20
N23
S17
S17
$18

N23
N19
S16
N28
N27
N26
N29
$24

N15

N22
$20
N18
N15
N20
N16
$22
$22
$21
$21

E61
E58
E39
E55
E25
£25
E28
E10
E15
Ell
woe
E05
wo4
E19
w23
wo4
WO5S
wos

£43
W18
E02

W27
W28
W32
waa

W68
E27
W33
W39
W77
was,
E20

W53
E12
W26
W39
W58

wa2
E58
w90
E63
E62
E55
E46
E61

E33

E16
E89

W57
wW90
E90
E14
WoL

W18

INDIVIDUAL STATION IMPORTANCE RATINGS

an

In

0

1b
2b
Ib
In
Sn

1b

Sn
In

in
Ib

if
In
if
1f

Sb

In
In

2b
In

in
Sn

0

In
1f

2b
In

ro

Ib
In

Sn
Sn

0

in
Sn

In Sn

1f0

2n 1n Sn
in In if 0 0

In if Sn0 0 0

In Sb Sb Sn Sn
000

lf SFO 0

Sf Sf 0

0 0

Sn Sn Sn
Sno0 0

lf Sn0 0 0

|
I
|
|
|
i
|
|



Table 1 (continued) '
McMath-Hulbert Observatory Finding List of Flares of Importance 21, 1967
Date Begin End Max. IMP. POSITION INDIVIDUAL STATION IMPORTANCE RATINGS
1967 (continued) " v
Mar = 31 = 2059 2110 2059 In? N19 W65 In

Mar 31 2212 300 (3338) In N18 W63 In In Sn
2232

Apr 2058 220 2130. In N28 E11 2n In 1f

Mar 31 2347 2430 2406 = In? N22 W67 Ib ind 0 |
Apr 1 0003 051 0016 In S23 W68 2n 1b In Sn0 0 ;
Apr 1 0119 140 0122 In N24 W75 1b In 1f 0 '
Apr 1 238 257 0244 «In? N18 W69 In ind 0 i]
Apr 1 347 0402 0350 = 1b? N20 W70 1b 1b Sb 0 j
Apr 1 618 632 0621 1b N19 W70 lb 1b 1b 1b Ind O i
Apr 1 632 720, (0638) In $20 WO6 2n 2n 2f In 1f0 0 0 {
0654
Apr 1 1023 1102 1025 2n S22 W72 2b 2f 2f In 0
Apr 1 1410 1433 lb N21 W80 1b 1b In 1n Sb if
Apr 1 1414 1427 In? S24 W74 2n ind 0 t
1 i
Apr 1 2236 2315 9) In S24 W78 lb In 1f 0 i]
2252 '
Apr 0407 0440 (C028) In N24 W86 In In ind 0 '
0424 t
Apr 0818 0823 $24 W79 2n 2n 2n 1b 1n In SbO 0 f

1120 In $23 W81 2n 1b In Sn 0

1f? S20 W40 In lf 1f0 0

2
2

Apr 2° 1116
Apr 9
1

Apr 1 745 (0728) In S19 W64 2n 1b 1n In Sn 0
0753

Apr 11 112 1142 (ti2) 1n? S21 W65 2n 2n 2n 1b 1f Sn 0
1124

Apr 11 1336 1440 1344 Ib N22 W24 2n 1b 1b 1b In In In in
Apr 11 101 2154 (310) lb S23 W72 2b 1b In
2124
Apr 12 053 0558 1b $22 W74 1b in 0
Apr 12 Tit 1125 1110 In S20 W75 In In In 1f
Apr 13 1926 2026 1942 1f? N23 W53 if
Apr 14 1703 1737 1715 2n N24 W71 2b 2n Sb
Apr 14 2236 2256 2241 —1f? N21 W66 In 1f Sn 0

Apr 15 1807 1836 1810 1f? N30 E49 1

Apr 20 2116 215 In N21 E55 2n 1b In In In

Apr 23 ©0020 0051 In S22 W67 2f 1b In In Sn

Apr = 25 500 532 In? S14 wos 2f lb In in Sn0 0 0 0

Apr = 25 1926 1000 0932 = 1b S26 W75 2n 1b 1b 1b 1b In Sn Sn
Apr 25 1038 1051 1041 In S21 W27 In In 1f Sn
Apr 27 1602 1621 1606 in S22 E80 1b 1b In in In Sb
Apr 29195: 020 2000 «1f? N18 W82 1f 0
Apr 30-0938 1010 0945 in S20 E42 2n 2n 1b lb 1b 1f Sn SnO0 0 0
Apr 30 ©1044 1135 (1987) In S21 E42 2n 1b 1b In Sn SF0 0
1121

Apr 30 1333 1309 in $22 £40 2n 1b In In 1n Sn Sn 0

Apr 30 2337 2326 = 1n? N15 E85 In ind 0

May 1 0815 in $22 E30 2f In In In In In 1f SFO 0

May 2 1444 1425 In N17 E61 In ln

May 3 1830 (1238) 2b N22 E50 3n 2b 2b 2b 2b 2b 2b 2b 2n 0
1645

May

4 0126 0320 0214 an? N32 E24 2n2n0 0 0 0
May 6 0435 0545 0439 2n? $20 W34 3n 3f 2b 2n 1b 0
May 8 112 1440 1136 2n $21 W60 3b 3n 3f 2b 2b 2n 2n In In InSnO 0 0 0
May 10 1145 1240 1153 2n S22 W87 2n 2n 2n 2n 2n In Sb Sb 0 |
May 12 1755 1830 1802 In N24 W68 2n 1b In Sb Sn 7
May 14 1533 1640 1547 In S27 E08 in 1n 1n in In In in Sn Sn '
May 15 0855 921 In? $13 E79 1b In In Sn0 0 t
May 18 1934 1951 1938 In N25 E80 In In In 0
May 19 1239 131 1257 1b? N24 E65 1b 1b 1n 1n Sb Sb Sn Sn
May 19 1524 1615 1538 = 1b N24 E70 2b 2n 1b 1b In in ind O
May 20 1005 1025 1009 1b N25 E53 1b 1b 1b Sn 0
May 20 1508 1615 Ib N23 E51 2b 1b 1b in In In Sb 0



Table 1

McMath-Hulbert Observatory Finding List of Flares of Importance 21, 1967

Date Begin End Max. IMP. POSITION INDIVIDUAL STATION IMPORTANCE RATINGS
UT UT UT

1967

Jan. 1 1030 1100 db N16 E57 1b 1b 1b Sn Sn

Jan 2 0354 0419 0405 in? $21 WOl In

Jan 2 1733 1753 1737 1f? S28 E67 1f0 |

Jan 3 2131 1200 1138 in N16 E26 In In If Sn Sn |

Jan 3 1736 181 1754 In $21 W28 In In In 1f |

Jan 4 0204 217 0208 In? $22 "33 In Sn |

Jan 4 0325 0340 0326 2f? S25 u34 2f0 |

Jan 4 1530 1630 1540 in N15 E11 1b in if lf |

Jan 4 1822 1845 1830 if? N35 E82 1f0 }

Jan 4 1825 1842 1830 in? N34E57 Ind i

Jan 5 O117 0342 if? S26 E34. © 2n 2F 0 O |

Jan 5 0440 0505 0445 in? N16 E03 in0 |

Jan 5 1326 1414 1334 In? N15 E02 in0

Jan 7 0540 0627 0552 in? S24W77 2f Ind O |

Jan 8 1745 1821 in? N22 £12 In In Sn Sf |

Jan 11 0131 0317 0259 3b? S26W47 3b

Jan 11 0317 -0251/-« tb? N20 W76—b

Jan 11 0344 0510 2f2 S28. W42 of

Jan 11 0348 0352 In? N10 W38. In

Jan 11 0542 0554 0544 in? N16 W87 = In

Jan 11 1423 1445 1427. In $19 W75 In In

Jan 12 0231 0305 1f? N16 W901 |

Jan 12 1120 1150 in? $22 E50. In

Jan 12 1320 1340 1326 in? S21 W85 In

Jan 13 1220 1235 1b? N28 WeO = 1b 0.

Jan 13 1819 1940 1830 In $31 W80 In In In Sf

Jan 14 1027 105 1031 In N13 W80 1b In 0

Jan 14 1636 1723 1702 In N28 E83 2n In Sn

Jan 14 1738 1845 in N15 W40 1b In in

Jan 14 2 2405 2325+ 2n N23 W70 2b 2n Sn

Jan 16 0032 101 0041 In N16 W57 1b In

Jan 17 0036 0041 0038 if? N15 W82 if

Jan 18 0030 0049 1f? «N19 E59 «1f 0

Jan 18 0616 0700 0623 in Ni7 E57  2n tb ib in lf

Jan 18 2003 2022 2009 In N21 £89 1b 1b In Sn

Jan 19 0606 0648 In N17 £44 2n 2n 1b 1b In

Jan 20 1512 155. (3333) In N16 E62 =. 1b In If |
1542 |

Jan 20 2044 2130 2050 In N23 E63 1b In In Sn |

Jan 21 2131 2230 2149 Ib N22 £48  2n 1b 1b 1b In |

Jan 22 2054 2119 2108 in? N13 E27 ind |

dan 23 0717 731 0722 1f? Ni2 E27 1f0

dan 23 1214 1224 1b? N14 E25 db

Jan 24 0609 0644 0614 In N22 E16 1b In In 1f 0

Jan 24 2023 2108 2027 ib? N22 E09 1b Sb

Jan 25 2015 2045 2023 1f? N20 E90 lf

dan 26 1143 1205 1148 In N15 W18 1b 1b In Sn :

Jan 26 1250 1300 in? N10 W46 In i

Jan 26 2100 2122 In N28 E70 In lf |

dan 27 i511 1550 1520 1n? N20 W59 In
dan 27 319 2400 2330 In N16 W32 In In 1n Sb
Jan 29 1612 1730 1620 2n $26 E02 2b 2n 2n 2n In

Jan 31 0037 0114 In N19 W60 lb 1f
Jan 31 0204 022 0213 3f? N28 E90 3f
dan 31 1600 1616 1605 1? N26 E74 if
Feb 1 0745 0805 in? S25 W37 nod
Feb 0750 0805 In? N25 W90 In 0
Feb 110 125 0112 =«1f? S26 E21 1f 0
Feb 0145 228 0154 In N29 E62 In In

Feb 1641 191 1659 2b N11 E40 2b 2b 1b |
Feb |
Feb

425 In N14 W37 In 1f Sn

1
2
2
Feb 3 252 0400 0306 2b N13 E61 2b 2b 1b
4
5 8
5 1410 1535 1410 «In $18 £13 2n in




Date

1967
Sept
Sept
Sept
Sept
Sept
Oct
Oct
Oct
Oct
Oct
Oct
Oct

Oct
Oct
Oct

Oct
Oct
Oct
Oct
Oct
Oct
Oct
Oct
Oct
Oct

Oct
Oct
Oct
Oct
Oct
Oct
Oct

Oct

Oct
Oct
Oct
Oct
Oct
Oct
Oct
Oct
Oct
Oct

Oct
Nov
Nov

Nov
Nov

Nov
Nov
Nov
Nov
Nov
Nov
Nov

Table 1 (continued)

McMath-Hulbert Observatory Finding List of Flares of Importance >1, 1967

Begin
UT
(continued)
25 2030
25 2157
28 0338
28 (1127
30 = 1300
1 0838
1 0935
2 0756
2 2151
4 1600.
5 1354
6 1102
6 121
6 1317
7 0231
7 113
7 2044
8 758
8 029
14 0935
14 1225
14 120
20 ©0004
20 1050
21 1945
22
22
23
24
24
24
25
25
26 0608
26 ©1012
27 0917
27. 1945
28 1406
28 «1846
28 © 2205
29 0258
29 = 1842
29° (2347
31 (1124
2 0852
2 1147
3 0439
3 1159
3 2327
4 151
5 0900
5 2234
7 2218
10 1317
10 1517
10 2130

End
UT

(
(

Max.
UT

2034
2206
0342

1305
0847

0758
2154

1103
1116
1225
1320
0240
0347
1133
2050
0810

0945
1233

0009
1114

)
)

IMP,

In?
In
In?
In?
In
In
In
In
In
in
In
In?

ln
In
1b?

1f
2b
2n

In
In

1b
In?
In

1b
1b
In?

lb

POSITION INDIVIDUAL STATION IMPORTANCE RATING

Nog
N12
N19
N14
N17
N22
N12
N16
$20
N17
$17
$18

S17
S17
S16

$17
$18
$14
$17
N14
N16
N17
N16
N17
N14

N11
N10
N14
N20
Nog
S21
NO9

N10

N10
N10
NO9
N16
$22
N13
N13
N10
$25
N10

$19
S18
N20

N17
N18
S17
$18
$25
S18
N25
S26
S26
$25

E78
E77
E55
E41
E17
£19
E03
W34
E46
W31
W25
W36

W37
W38
w47

W57
W62
W63
W69
Wa7
wW45,
w49
E27
E21
E58

E22
E15
E10
E29
W13
WO1
w24

w28

W38
w42
W50
w80
E35
W71
W71
W80
E70
w90

E21
wo2
W59

W70
W76
w21
W33
Wa
Was
W63
W82
W384
W83

11

In
In
1b
3n
af
2b
2n
In
Ib
In
én
lb

2b
2b
1b

af

In
In
In
2b
In

Sn
In
Sn
af
In
2n
ef
In
Sn
0

In
In

1b
lb

Sn
In

lf
Ib
Sn

In
In

Sb
Sf

In
Sb

2n
2b
In

if

1b
lf

Sf
In

In
In

Sn

In
Sn

In
In

2n
if

lb
Sf

ln

Ib
In
Sn

In
In

Sb

lf

Sn
Sn

In

In
In

In
In

Sf

Sn

Sn

0
Sn

Sf

0

In In in 1f
In Sb Sn 0

Sn

In In Sb Sn Sn Sn
ln 0

Sn 0

0 0
Sn Sn Sn

00

000

|
.

|
|
I



Table 1 (continued)
McMath-Hulbert Observatory Finding List of Flares of Importance 21, 1967
Date Begin End Max. IMP. POSITION INDIVIDUAL STATION IMPORTANCE RATING
1967 (continued) " "
Dec 24 1938 1954 1942 In $29 W22 In Sn

Dec 26 0627 In S16 E14 1b In in Sf 0

Dec 26 1309. In $14 E80 2b 2n 1b In In Sn

Dec 26 1342 In S24 E23 2n 1b In In In Sf 0

Dec 26 1931 In? S11 W79 2n In Sf 0

Dec 26 2027 2n? $15 E73 2b 2n 1b 1f Sn

Dec 27 0619 In S11 E66 lb In 1f 0

Dec 27 (e808 In S17 E59 3b 2b 2n 1b In In in In
0905

Dec 27 1942 2055 (2388 1b S16 WO9 1b 1b In
2008

Dec 28 O2ii 0304 0223. «1b S17 W12 1b 1b 0

Dec 28 0550 0606 0553 In S17 E56 In In

Dec 28 1335 1530 In S21 W19 2n 1b 1b In In In In 0
Dec 29 0047 0100 0050 In S27 W78 1b In In Sn

Dec 29 0106 0140 0110 = ib S15 W22 lb 1b In Sb

Dec 30 2222 2234 2227 An? S15 E72 In Sn

Dec 31 067 0621 2f? $18 W90 af

;

Table 2 compares, by month and importance, the flare data in the Quarterly Bulletins for 1967
and in the Finding List.

Table 2 i

Importance of Flares in Quarterly Bulletin before and after
Reevaluation on Basis of all Observing Stations, 1967

|
\
Total Importance in Q.B. Importance after Reevaluation i]
Month Number] § 1f In _ lb 2 3 S [if In 1? lb 2 22 3.3? |
Jan. 151 64 22 46 10 7 2 97 19 27 2 2 2 2
Feb. 127 33 12 53 16 il 2 70 1 15 18 Ul 6 4
Mar. 217 93] 14 84 19 6 1} 150] 3 36 9 13 4
Apr. 191 78 27 60 13 12 1 155 17) «121 6 2 :
May 169 72 21 51 11 13 1 128 16 5 8 9 2 1 t
June 142 68 25° 42 4 3 118 1615 2 4 1 1 |
July 253 103 38 72 25 14 1 198 2 24 15 12 2
Aug. 186 78 13°67 14 #13 1 136 1 23 10 9 6 1
Sept. 78 35 11 26 1 5 62 8 2 |
Oct. 149 50 21 56 11 12 110 3°19 4 |
Nov. 125 50} 22 40 5 7 1 95} 6 10 3 1 i
Dec. 203 78 19 82 16 6 2 149 2 27 ll 1 4 1
Total 1991 | 802 |245 679 145 108 12 }1468|19 229 130 80 42 14 7 2
Total Imp. =1 1189 523

13

t
|
|
|
|


SUBSCRIPTION PRICE:
copy price varies.*

WORLD DATA CENTER A

for
Solar-Terrestrial Physics

REPORT UAG-19

REEVALUATION OF SOLAR FLARES
1967

by

Helen W. Dodson and E. Ruth Hedeman
McMath-Hulbert Observatory

The University of Michigan

and

Marta Rovira de Miceli
San Miguel Observatory
Argentina

Prepared by World Data Center A for
Solar-Terrestrial Physics, NOAA, Boulder, Colorado
and published by

U.S. DEPARTMENT OF COMMERCE
NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

ENVIRONMENTAL DATA SERVICE
Asheville, North Carolina, USA 28801

June 1972

Zi

$9.00 a year; $2.50 additonal for foreign mailing; single
Checks and money orders should be made payable to the

Superintendent of Documents, and orders should specify the Catalog order number.
Orders, remittances, and correspondence regarding subscriptions should be sent
to the Superintendent of Documents, Government Printing Office, Washington, D. C.

20402.

* Price this issue $.15 (Catalog Order Number C55.220:19)



WORLD DATA CENTER A

National Academy of Sciences
2101 Constitution Avenue, N. W. Washington, D, C. U.S.A., 20418

World Data Center A consists of the Coordination Office

and nine subcenters:

World Data Center A
Coordination Office

National Academy of Sciences
2101 Constitution Avenue, N.W.

Washington, D. C., U.S.A, 20h18

Telephone (202) 961-1478

Solar and Interplanetary Phenomena, Meteorology (and Nuclear Radiation):

Tonospheric Phenomena, Flare-Associated
Events, Aurora, Cosmic Rays, Airglow:
World Data Center A:
Upper Atmosphere Geophysics
National Oceanic and Atmospheric
Administration
Boulder, Colorado, U.S.A. 80302
Telephone (303) 47-1000 Ext. 3381

Geomagnetism, Seismology and Gravity:
Worla Data Center A:

Geomagnetism, Seismology and Gravity
Environmental Data Service, NOAA
Boulder, Colorado, U.S.A. 80302
Telephone (303) 447-1000

Glaciology:
World Data Center A:
Glaciology
U. S. Geological Survey
1305 Tacoma Avenue South
Tacoma, Washington, U.S.A. 98402
Telephone (206) 363-2861 ext. 318

Longitude and Latitude:
World Data Center A:
Longitude and Latitude
U. S. Naval Observatory
Washington, D. C., U.S.A. 20390
Telephone (202) 698-822

World Data Center A:

Meteorology

National Climatic Center

Federal Building

Asheville, North Carolina, U.S.A. 28601
Telephone (70) 254-0961

Oceanography:

World Data Center A:

Oceanography

National Oceanic and

Atmospheric Administration
Rockville, Maryland, U.S.A. 20852
Telephone (202) 698-3753

Rockets and Satellites:

World Date Center A:
Rockets and Satellites
Goddard Space Flight Center
Code 601

Greenbelt, Maryland, U.S.A. 20771
Telephone (301) 982-6695

Tsunami:

World Data Center A:

‘Tsunami

National Oceanic and Atmospheric
Administration

P. 0. Box 3887

Honolulu, Hawaii, U.S.A. 96812
Telephone (808) 546-5698

Upper Mantle Project:
World Data Center A:
Upper Mantle Project
Lamont-Doherty Geological Observatory
Palisades, New York, U.S.A. 1096)

Telephone (91) 359-2900 Ext. 209
Notes:

(1) 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.

(2) 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),

(3) Inquiries and communications concerning data in specific disciplines should be addressed to
the appropriate subcenter listed above.



Date

1967
duly
July

duly
July

duly
duly
duly
duly
duly
duly
duly
duly
July

duly
July
duly
duly

duly
duly
duly
duly
duly
July

duly
duly

duly
duly
duly
July
July
duly
duly
July

duly
July
duly
duly
July
duly
duly
duly
duly
duly
duly
July
duly
duly
duly
duly
Aug

Aug
Aug
Aug
Aug

Table 1 (continued)

McMath-Hulbert Observatory Finding List of Flares of Importance =1, 1967

End
Ut

Begin
UT
(continued)
6 2359
7 1526
7 1946
7 2040
8 2237
9 0313
20 0547
20 0717
20 ©2206
21° 2250
22 1418
22 «2152
23 0010
23 0440
23 0538
23° 1244
23 1809
24 0024
24 0415
24 ©0928
24 = =0959
24 «1152
24 2015
25 10.10
25 055
25 121
25 = 1338
25 = 1425
25 172
25 191
26 «0225
26 0654
26 ©0918
26 «1344
28 = 1849
29 242
29 402
29° 1453
29° 1927
30 08
30 0615
30 ©1410
30 1612
31 0045
31 808
31 0855
31-1225
31 1950
31 2047
1 0535
1 1721
1 1744
2 043
2 1516

(1831

(

(0932

(1838

(
(
(

(

(

Max.
UT

2403

1547,
1953
2046
2057
2244
0318
0551
0724
2212
2303
1420
2211

0115
0443
0543
1302

1825,
0035
0422

1000

2020
2104
0014
0039
1058
1120
1216
1349
1429
1728
1914
0227
0700
0921
0940
1347
1854
0246
0432
1508
1948
0513
0620
1417
1635
0055

0857
1228
2004
2114
0555
0641
1738
1753
0048
1522

)
)

)
)

)
)
)

)

)

IMP.

POSITION

N27
N28

N27
N25

N30
N27
$22
$22
S21
N24
N13
N14
N16

N12
N12
N12
N11

N11
N10
N27
N10
N27
N26

N29
N27

N27
N27
N28
N27
N28
N27
N26
N13

N27
N12
N16
S26
N25
N24
N24
N26
N15
N26
N22
N25
N13
N23
N27
N23
N25

N27
$25
N26
N20

w82
W77

E24
E24

W90
E09
E50
£49
W50
E82
E90
E90
E90

E80
E84
E75
E72

E66
E65
E54
£63
E53
E47

E43
E38

E40
E39
E39
£37
E34
£33
£30
E36

E27
E02
E19
W63
W16
w22
W27
W29
W10
W36
W39
wa2
Ell
Wa4
Wa5
W50
W53

W62
E18
W58
WO6

INDIVIDUAL STATION IMPORTANCE RATING

Ib 0
In In

In In
lf 1f

lf

In 1f
2n 2F
2n 2n
Ind

1f0

2n 1b
if

1f

ln

lf
if

1f Sn SFO 0

Sf

1b
1b

lb
In

In

Sn

In
In

In

In
In

In

Sb
Sb

Sn
Sn

Sf
Sn

Sn

In
1f

In

Sb
Sb
Sb

In

Sb

Sn

Sn
Sn

0
0
Sn

oo

Sn

Sn

In
Sn
Sn

0

0
0.0

noo

Sn 0

In In In Sn Sn Sf
00000
Sn Sn0 0

|
|
|
|
|
|
|


Date Begin
UT
1967 (continued)
Nov 11 1214
Nov 13 1808
Nov 16 1002
Nov 16 2003
Nov 16 212
Nov 17 0817
Nov 17 1532
Nov 17 1/71
Nov 18 2224
Nov 18 222!
Nov 18 2250
Nov 19 1018
Nov 25 0804
Nov 27 3.15,
Nov 27 1602
Nov 29 1159
Nov 29 1852
Nov 30 1300
Dec 1 0335
Dec 1 0746
Dec 1 1250
Dec 1 1932
Dec 4 1302
Dec 5 1439
Dec 5 1519
Dec 6 1615
Dec 10 0808
Dec 11 1900
Dec 11 154
Dec 11 2347
Dec 12 0124
Dec 13 051
Dec 13 332
Dec 13 716
Dec 13 0851
Dec 13 1035
Dec 13 1340
Dec 14 1110
Dec 16 0247
Dec 16 0941
Dec 16 1803
Dec 17 0440
Dec 17 0643.
Dec 17 0746
Dec 18 0134
Dec 18 0242
Dec 18 0816
Dec 18 1015
Dec 18 1026
Dec 18 1434
Dec 19 222
Dec 20 1800
Dec 21 091
Dec 22 093
Dec 22 315
Dec 23 2101

Table 1 (continued)

McMath-Hulbert Observatory Finding List of Flares of Importance = 1, 1967

End
UT

1240
1900
1100
2030

(

(
(

(

(
(

(

Max
UT

1816
1011
2008
2143
0821
0840
1534

2301
2230
2259
1037
0809
0318
1610
1159
1852
1902
1305
0345

1252
1304.
1947
1310
1445
1526
1621
0815
1905

2215
2358
0138
0056
0338
0721

1117
0255
0944
0956

0441
0646
0702
0748
0138
0259

1035
1045
1444
2230
1812
0914
0937
1320
2106

)

)
)

5200)

)

)

IMP.

POSITION

S26
N11
N10
N18
N11
N10

N21
N16
Noo
N19
N19
N11
N19
N22
N25
N28
$29

N27
S27
N27
$28

S27
$19
N24
N22
N23
S16
N12
N14

$22
N24
N12
N12
N27
N13
Noo
$22
Nil
N23
N20

N20
N19
N19

N26
N25
N19
N23
N19
$35

N20
N23
N22
N26
$19
N17
N25

w90
E74
E38
£43
E33
E26

E90
E47
W33
E85
E81
W38
WO3
W38
W53
W68
W54

W85
w70
w90
W75

W82
w90
E53
E81
E36
E28
W56
w48,

wi7
W33
W64
W65
E52
W70
E35
W37
E33
E66
E13

E08
E03
E02

W37
W50
Wii
E29
w19
W76

£32
W69
W82
£04
E52
wW70
w19

12

INDIVIDUAL STATION IMPORTANCE RATING

Sf

In

In
Sf

in
Sn

1b
Sf
2n

if
Ib

Sn
Sb
Sb
0

Sn

in
Sn
Sn
In

0

Sn

1f

Ib
Sb

In

Sn

Sf

In

0
0

2n 2n 1b 1b 1b 1b In 0

lf SnO 0

1b in 0

Sf

Sn 0

Sn Sn Sn

0
1b 1b In Sf
Sn 0

1f Sn SnO 0

Sb Sb Sn