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SION IWNOUOO UV10d JO SNSOWLVS avInoilavd

40


HARVEY, J.,
J.B. GILLIESPE,

P, MIEDANER, and
C. SLAUGHTER

MARAN, S.P. and
R.J. THOMAS

McINTOSH, P.S.

McINTOSH, P.S.

McINTOSH, P.S.

SANCHEZ-IBARRA, A.

Solar-Geophysical Data

SPEICH, D.M.,
J.B. SMITH, JR.,

R.M. WILSON, and
P.S. McINTOSH

TIMOTHY, A.F. and
A.S. KRIEGER

WEBB, D.F.,
J.M. DAVIS, and

P.S. McINTOSH

1980

1973

1975

1979

1991

1990

1970-91

1978

1975

1984

"Synoptic Solar Magnetic Field Maps for the Interval
including Carrington Rotations 1601-1680 (May 5,

1973-April 26, 1979)", Report UAG-77, NOAA, CC.
World Data Center A for Solar-Terrestrial Physics,
Boulder, Colorado, USA 80303-3328, 66 pp.

"The OSO-7 Year of Discovery", The New

Astronomy and Space Science Reader, J.C. Brandt
and S.P. Maran, Editors, W.H. Freeman and
Company, San Francisco, USA, pp. 295-301.

"H-Alpha Synoptic Charts of Solar Activity for the
Period of Skylab Observations (May 1973-March

1974)", Report UAG-40, NOAA, World Data Center
A for Solar-Terrestrial Physics, Boulder, Colorado
80303-3328, USA, 32 pp.

"Annotated Atlas of H-Alpha Synoptic Charts for

Solar Cycle 20 (1964-1974)", Report UAG-70,
NOAA, World Data Center A for Solar-Terrestrial
Physics, Boulder, Colorado, USA 80303, 327 pp.

"Atlas of Stackplots", Report UAG-101, NOAA World
Data Center A for Solar-Terrestrial Physics, Boulder,
Colorado, USA, 80303-3328, 188 pp.

"Longitudinal and Temporal Variations of Sunspot
Regions and Coronal Holes During Cycle 21", Solar
Phys., 125.

NOAA, World Data Center-A for Solar-Terrestrial
Physics, NGDC, Boulder, Colorado, USA, 80803.

"Solar Activity during Skylab -- Its Distribution and
Relation to Coronal Holes", NASA Technical

Memorandum 78166, Marshall Space Flight Center,
Alabama, USA.

"The Structure and Evolution of Coronal Holes",
Solar Phys., 42, 135-156.

"Observations of the Reappearance of Polar
Coronal Holes and the Reversal of the Polar

Magnetic Field", Solar Phys., 92, 109-132.



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-73

UAG-74

UAG-75

UAG-76

UAG SERIES OF REPORTS (Cont inued)

ATS-6 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 Haske} Allen, Car? C
AURORA tt Lestie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder
CO, December 1976, 144 pp.

GEOMAGNETIC DATA FOR JANUARY 1976 [AE(7) INDICES AND STACKED MAGNETOGRAMS], by Joe Haskel] Al-
jen, 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 TI 20 MARCH - 5 MAY 1976, edited by Helen E. Coffey and
soe A. NeKinnon, World Data Center A for Solar-Terrestrial Physics, Boulder, 0, August 1977,
313 pp.

GEOMAGNETIC DATA FOR FEBRUARY 1976 [AE(7) INDICES AND STACKED HAGNETOGRAMS], by Joe Haske11 Al-
Ten, 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 Haske] Allen,
Carl C. Abston and Leslie D. Morris, National Geophysical and Solar-Terrestria} Data Center
Boulder, CO, September 1977, 57 pp.

GEOMAGNETIC DATA FOR APRIL 1976 (Ae(8) INDICES AND STACKED MAGNETOGRAMS], by Joe Haskell] Allen,
Car] 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. Nayfield and Fred I. Shimabuku-
to, 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, Tonospheric Prediction Service, Sydney
hustralia, August 1978, 30 pp, $4.00 (microfiche only).

A COMPARATIVE STUDY OF METHODS OF ELECTRON DENSITY PROFILE ANALYSIS. by LiF. Mchanara. Iono-
Spheric Prediction Service. Sydney, Australia, August 1978, 30 pp, $4.00 (microfiche only)

SELECTED DISTURBED D-REGION ELECTRON DENSITY PROFILES. THEIR RELATION TO JHE UNDISTURBED D RE-
GION, by L.F. McNamara, Tonospheric Prediction Service, Sydney, Australia, October 1978, SO pp.
$4.00 (microfice only).

ANNOTATED ATLAS OF H-ALPHA SYNOPTIC CHARTS FOR SOLAR CYCLE 20 (1964-1974) CARRINGION SOLAR R0-
TATIONS 1487-1616, by Patrick S. McIntosh, NOAA Space Environment Laboratory, Boulder, CO, Feb-
ruary 1979, 327 pp.

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~

teas] Data Center, Boulder, CO; H.A. Henning, Lockheed Missiles and Space Co., Aurora, CO; and

Y. Kamide, Kyoto Sangyo University, Kyoto, Japan, Apri] 1979, 118 pp

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 N. Rust, American Sci-
énce and Engineering, Inc., Cambridge, MA; and A. Gordon Ems lie, Harvard-Smithsonian Center for
Astrophysics, Cambridge, MA, July 1979, 68 pp, $4.00 (microfiche only).

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11-12) FOR JANUARY ~ JUNE 1975, by Joe Haskell
Alten, Carl C. Abston, J.£. Salazar and J.A. McKinnon, National Geophysical and Solar-Terres~
trial Data Center, NOAA, Boulder, CO, August 1979, 114 pp, $4.00 (microfiche only).

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

by $.D. Bouwer, K. Davies, R.F. Donnelly, R.N. Grubb, J.E. 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.

THE ALASKA IMS MERIDIAN CHATN: MAGNETIC VARIATIONS FOR 9 MARCH - 27 APRIL 1978, by H.W. Kroehl
and G.P. Kosinski, National Geophysical and Solar-Terrestrial Data Center, Boulder, cO; S.-1.

Akasofu, G.J. Romick, C.E. Campbell and G.K. Corrick, University of Alaska, Fairbanks, AK; and
C.E. Hornback and A.M. Gray, NOAA Space Environment Laboratory, Boulder, CO, dune 1980, 107 pp.

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



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36


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-55

UAG-56

UAG-57

UAG SERIES OF REPORTS (Continued)

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

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 S. 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.

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.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1972, by Joe Haskell Allen, Carl C.
Abston and Leslie 0. Morris, National Geophysical and Solar-terrestrial Data Center, Boulder,
CO, May 1975, 144 pp, $4.00 (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.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1973, by Joe Haskel] Allen, Carl C.
Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder,
CO, June 1975, 144 pp, $4.00 (microfiche only).

[Superseded by UAG-48A)

SYNOPTIC OBSERVATIONS OF THE SOLAR CORONA DURING CARRINGTON ROTATIONS 1580-1596 (11 OCTOBER 1971
~ 15 JANUARY 1973), [Re-issue of UAG-48 with quality images], by R.A. Howard, M.J. Koomen, D.J.
Michels, R. Tousey, C.R. Detwiler, D.E. Roberts, R.T. Seal, and J.0. 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. Supersedes UAG-48

(Superseded by UAG-92]

HIGH-LATITUDE SUPPLEMENT TO THE URSI HANOBOOK ON IONOGRAM INTERPRETATION AND REDUCTION, edited
by W.R. Piggott, British Antarctic Survey, c/o Appleton Laboratory, Slough, UK, 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, OC, November 1975, 30 pp

EXPERIMENTAL COMPREHENSIVE SOLAR FLARE INDICES FOR CERTAIN FLARES, 1970-1974, by Helen W. Dodson
and E. Ruth Hedeman, McHath-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]

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, $4.00 (microfiche only).

TSO-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



CATALOGUE OF CORONAL HOLES 1970-1991

TABLE OF CONTENTS

Page
1. INTRODUCTION 1
2. DATA SOURCES 1

3. TYPES, IDENTIFICATION AND CLASSIFICATION CRITERIA 3

4. CHARACTERIZATION 4

5. COMPUTED PARAMETERS. 6

6. ACKNOWLEDGMENTS 7

7. REFERENCES 7

8. TABLE 1. DATA SOURCES 9
TABLE 2. BEGIN DATE OF CARRINGTON ROTATIONS 1557-1878 10-13

9. LIST 1. GENERAL CATALOGUE OF ALL POLAR CORONAL HOLES 15-19

10. LIST 2. GENERAL CATALOGUE OF ALL EQUATORIAL CORONAL HOLES_ =. 21-32

11. LIST 3. PARTICULAR CATALOGUE OF POLAR CORONAL HOLES 33-45
-- Those Visible for More Than One Carrington Rotation

12. LIST 4. PARTICULAR CATALOGUE OF EQUATORIAL CORONAL HOLES__ 47-64
-- Those Visible for More Than One Carrington Rotation


UAG-97

UAG-98

UAG-99

UAG-100

UAG-101

UAG SERIES OF REPORTS (Cont inued)

NUMERICAL MODELING OF POLAR TONOSPHERIC ELECTRODYNAMICS FOR JULY 23-24, 1983, UTILIZING TONO-
SPHERIC CONDUCTANCES DEDUCED FROM DMSP X-RAY IMAGES, by B.-H. Ahn, Kyungpook National Univer-
sity, Taegu, Korea; E. Friis-Christensen, Division of Geophysics, Danish Meteorological Inst i-
tute, Copenhagen, Denmark; D.J. Gorney, Space Sciences Laboratory, The Aerospace Corporat ion
tos Angeles, CA; Y. Kamide, Kyoto Sangyo University, Kyoto, Japan; and H.W. KroehT, Nationa?
Geophysical Data Center, NOAA, Boulder, CO, April 1988, 133 pp.

TYPE II SOLAR RADIO BURSTS RECORDED AT WEISSENAU 1966-1987, by H.W. Urbarz. Astronomical In-
deitute of Tubingen University, Weissenau Station, 7980 Rasthalde, Ravensburg, GFR. February
1990, 86 pp.

PROCEEDINGS OF THE WORKSHOP ON GEOPHYSICAL INFORMATICS, MOSCOW, AUGUST 14-18, 1988, edited by
J.H. Allen, National Geophysical Data Center, NOAA, Boulder, CO; and V.A. Nechitailenko, Soviet
Geophysical Committee, Academy ‘of Sciences of the USSR, Moscow, USSR, January 1991, 304 pp.

CATALOGUE OF SOLAR FILAMENT DISAPPEARANCES 1964-1980, by C.S. Wright, Electronics Research Lab-
Gratory, Defence Science and Technology Organisation, Salisbury, South Australia 5108, Austral-
ja, February 1991, 62 pp.

ATLAS OF STACKPLOTS DERIVED FROM SOLAR SYNOPTIC CHARTS, Evolution of Large-Scale Magnetic Fields
and Coronal Holes from H-alpha Synoptic Charts: 1966-1987, by P.S. McIntosh, NOAA Space Environ-
ment Laboratory, Boulder, CO; and E.C. Willock and R.J. Thompson, IPS Radio and Space Services.
West Chatswood, New South Wales 2057, Australia, October 1991, 188 pp.

*U.S. GOVERNMENT PRINTING OFFICE: 1992-774-025/69031



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-91

UAG-92

UAG-93

UAG-94

UAG-95,

UAG-96

UAG SERIES OF REPORTS (Cont inued)

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

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

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.

EXPERIMENTAL COMPREHENSIVE SOLAR FLARE INDICES FOR MAJOR‘ AND CERTAIN LESSER FLARES, 1975-1979,
compited by Helen W. Dodson and €. Ruth Hedeman, The Johns Hopkins University, Laure, MD, July
1981, 33 pp.

ANCEUTIONARY CHARTS OF SOLAR ACTIVITY (CALCIUM PLAGES) AS FUNCTIONS OF HELIOGRAPHIC LONGITUDE
AND TIME, "1964-1978, by E. Ruth Hedeman, Helen W. Dodson and Edmond C. Roelof. The Johns Hopkins
University, Laurel, MD, August 1981, 103 pp.

[NTERNATIONAL REFERENCE IONOSPHERE - IRI 79, edited by J. Virginia Lincoln and Raymond 0. Con=
kr ight, National Geophysical and Solar-Terrestrial Data Center, NOAA, Boulder, CO” Novenbec
1981, 243 pp.

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

TATALOG OF AURORAL RADIO ABSORPTION DURING 1976-1979 AT ABISKO, SWEDEN, by J.K. Hargreaves, C.M.
Oey 1or 2nd J-H. Penman, Environmental Sciences Department, University of Lancaster, Lancaster,
UK, July 1982, 69 pp.

(Superseded by UAG-91]
[Superseded by UAG-92]

CHANGES IN THE GLOBAL ELECTRIC FIELDS AND CURRENTS FOR MARCH 17-19, 1978, FROM SIX IMS MERIDIAN
CHAINS OF HAGNETOMETERS, by Y. Kamide, Kyoto Sangyo University, Kyoto, Japan; HW. Kroehl, Na~
[ional Geophysical Data Center, NOAA, Boulder, CO; and A.0. Richmond, NOAA Space Enviconment’La-
boratory, Boulder, CO, November 1982, 102 pp.

TAVERICAL MODELING OF TONOSPHERIC PARAMETERS FROM GLOBAL INS MAGNETOMETER DATA FOR THE CDAW-6
INTERVALS. by Y. Kamide, Kyoto Sangyo University, Kyoto, Japan; H.W. Kroch’, Nationa? Geophys i-
Gal Data Center, NOAA, Boulder, CO; and B.A. Hausman, National Geophysical Data Center, NOAA,
Boulder, CO, November’1983, 197 pp.

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, International Union of
Radio Science (URSI), Brussels, Belgium, May 1984, 233 pp.

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, 29] pp.
Supersedes UAG-35, 49, and 86.

TONOGRAM ANALYSIS WITH THE GENERALIZED PROGRAM POLAN, by J.E. 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

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

SOLAR-GEOPHYSICAL ACTIVITY REPORTS FOR STIP INTERVAL XV, 12-21 February 1984 Ground Level Event,
AND STIP INTERVAL XVI, 20 April - 4 May 1984 Forbush Decrease, compiled by Helen E. Coffey and
Joe H. Allen, National Geophysical Data Center, NOAA, Boulder, CO, July 1987, 418 pp



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30


SYNODIC ROTATION NUMBERS 1970-1993

Carrington Date of Carrington Date of
Rotation Number | Commencement Rotation Number | _Commencement

Year | Month | Day Year | Month | Day
1719 1982 | FEB | 26.0 1760 1985 | MAR | 20.3
1720 1982 | MAR | 25.3 1761 1985 | APR | 16.6
1721 4982 | APR | 21.6 1762 1985 | MAY | 13.8
1722 1982 | MAY | 18.8 1763 1985 | JUN | 10.0
1723 1982 | JUN | 15.0 1764 1985 | JUL 7.2
1724 1982 | JUL | 12.2 1765 1985 | AUG | 3.4
1725 1982 | AUG | 84 1766 1985 | AUG | 30.7
1726 1982 | SEP _| 4.7 1767 1985 | SEP | 26.9
1727 1982 | OCT | 1.9 1768 1985 | OCT | 24.2
1728 1982 | OCT | 29.1 1769 1985 | NOV | 20.5
1729 1982 | NOV | 25.5 1770 1985 | DEC | 17.8
1730 1982 | DEC | 22.8 1771 1986 | JAN | 14.2
1731 1983 | JAN | 19.2 1772 1986 | FEB | 10.5
1732 1983 | FEB | 15.5 1773 1986 | MAR | 9.9
1733 1983 | MAR | 14.8 1774 1986 | APR | 6.2
1734 41983 | APR [11.1 41775 1986 | MAY | 3.4
1735 1983 | MAY | 84 1776 1986 | MAY | 30.6
1736 1983 | JUN 46 1777 1986 | JUN | 26.8
1737 1983 | JUL 1.8 1778 1986 | JUL | 24.0
1738 1983 | JUL | 29.0 1779 1986 | AUG | 20.3
1739 1983 | AUG | 25.2 1780 1986 | SEP | 16.5
1740 1983 | SEP | 21.5 1781 1986 | OCT | 13.8
1741 1983 | OCT | 18.8 1782 1986 | NOV | 10.1
1742 1983 | NOV | 15.1 1783 1986 | DEC | 7.4
1743 1983 | DEC | 12.4 1784 1987 | JAN 3.7
1744 1984 | JAN | 8.7 1785 41987 | JAN | 31.1
1745 1984 | FEB | 5.1 1786 1987 | FEB | 27.4
1746 1984 | MAR | 3.4 1787 1987 | MAR_| 26.7
1747 1984 | MAR _| 30.7 1788 1987 | APR_| 23.0
1748 1984 | APR | 27.0 1789 1987 | MAY | 20.2
1749 1984 | MAY | 24.2 1790 1987 | JUN | 16.4
1750 1984 | JUN | 20.4 1791 1987 | JUL | 13.6
1751 1984 | JUL | 17.6 1792 1987 | AUG | 9.9
1752 1984 | AUG | 13.8 1793 1987 | SEP | 6.1
1753 1984 | SEP | 10.1 1794 1987 | OCT | 3.4
4754 1984 | OCT | 7.3 41795 1987 | OCT | 30.6
1756 1984 | NOV | 3.7 1796 1987 | NOV | 27.0
1756 1984 | NOV | 31.0 1797 1987 | DEC | 24.3
1757 1984 | DEC | 28.3 1798 1988 | JAN | 20.6
1758 1985 | JAN | 24.6 1799 1988 | FEB | 17.0
1759 1985 | FEB | 21.0 1800 1988 | MAR | 15.3

12



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56


tion of photospheric polarity sectors was also analyzed on each Carrington rotation. How-
ever, sometimes the identification was not very easy. Doubts about this parameter are noted
in the remarks.

Sometimes, two or more Coronal Holes of both or different types could have some
relation to each other during the rotation (their positions may relate), although this is not nec-
essarily a connection or disconnéction. In these cases, a possible relation is noted for both
holes involved. On the other hand, a hole was considered connecting or disconnecting with
another one depending on the persistence of itself. Usually in these phenomena implying a
Polar Coronal Hole and an Equatorial Coronal Hole, we denote for the Polar Coronal Hole
only its relation with the Equatorial Coronal Hole, and the Equatorial Coronal Hole is noted as
the hole that connects or disconnects to the Polar Coronal Hole.

For each typé of Coronal Hole, the catalogue is divided into a general list and a par-
ticular list. The general list presents all the Coronal Holes (see List 1 and List 2). Coordi-
nates and extension values are average values for those Coronal Holes that were visible for
more than one Carrington Rotation The particular list presents only the Coronal Holes visible
for more than one Carrington Rotation with-their specific values of coordinates and extension
for each Carrington Rotation (see List 3 and List 4).

3.3 Shape Classification

To make the identification of each Coronal Hole in the synoptic charts easier, and also
to explore a possible evolution of it, a shape classification is introduced in the catalogue (see
Figure 1).

* Polar Coronal Hole shapes are divided into conic (C), booted (B), ramified (R), sharp
pointed (P), irregular (1), elongated (E), dumbbell (D), and square (S).

« Equatorial Coronal Hole shapes are divided into almost circular (C), elongated (E), rami-
fied (R), irregular (I), and elliptical (E).

A Classification for each Coronal Hole was made for every Carrington Rotation.
4 CHARACTERIZATION

4.1 Identification -- Coronal Hole Number

For both parts of the catalogue (polar and equatorial), every Coronal Hole received a con-
secutive number in chronological order from higher to lower Carrington longitude for each
Carrington rotation.

4.2 Time observed -- Carrington Rotation
Carrington rotation(s) where the Coronal Hole was visible.

4.3 First observation -- Year
Year of the first Carrington rotation when the Coronal Hole was observed.



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SHTOH TVNOYOD IWINOLWNOA JO ANDO IWLVO UV INDILuVd

63


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. Please note that some reports are available on microfiche
only at $4.00 a copy and that a $10.00 handling charge will be added. In this case 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
UAG-12

UAG-13

UAG-14

UAG-15
UAG-16

UAG-17

UAG-18

UAG-19

HOS NIGHT AIRGLOW DATA, by L.L. Smith, F.£. Roach, and J.M. McKennan, ESSA Aeronony Laboratory,
Boulder, CO, July 1968, 305 pp.

A REEVALUATION OF SOLAR FLARES, 1964-1966, by Helen W. Dodson and £. Ruth Hedeman, McMath-Hul-
bert Observatory, University of Michigan, Pontaic, 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 I. 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-
soln, World Data Center A, Upper Atmosphere Geophysics, ESSA [now NOAA], Boulder, CO February
1969, 120 pp.

INTERNATIONAL GEOPHYSICAL CALENDARS 1957-1969, by A.H. Shapley and J. Virginia Lincotn, 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 Lincoin, World Data Center A, Upper Atmosphere Geophysi¢s, ESSA [now NOAA], Boulder,
CO, March 1970, 312 pp, (includes Parts 1 and 2).

PATA ON COSHIC RAY EVENT OF NOVEMBER 18, 1968, AND ASSOCIATED PHENOMENA, compiled by J. Virginia
yancoln, World Data Center A, Upper Atmosphere Geophysics, ESSA [now NOAA], Boulder” CO, April
1970, 109 pp.

ATLAS OF TONOGRAMS, edited by A.H. Shapley, ESSA Research Laboratories [now NOAA], Boulder, co,
May 1970, 243 pp.

[Superseded by UAG-30]

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

DATA ON THE SOLAR PROTON EVENT OF NOVEMBER 2, 1969, THROUGH THE GEOMAGNETIC STORM OF NOVEMBER a
10, 1969. compited by Dale B. Bucknam and J. Virginia Lincoln, World Data Center A, Upper Athos.
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. Faire
banks, AK: V.H. Oriatskiy, Arctic and Antarctic Research Institute, Leningrad, USSR: K. Henrik-
con turoral Observatory, Tromso, Norway; D.H. Jelly, Communications Research Center, Ottans,
Ranada; T.1. Shchuka, Arctic and Antarctic Research institute, Leningrad, USSR; A. Theander,
Kiruna Geophysical Observatory, Kiruna, Sweden; and J. Yliniemi, University of Oulu, Oulu, Fin-
land, September 1971, 131 pp, $4.00 (microfiche only).

FONOSPHERIC DRIFT VELOCITY MEASUREMENTS AT JICAMARCA, PERU (JULY 1967 - MARCH 1970), by Ben 8.
Baisley, NOAA Aeronomy Laboratory, Boulder, CO, and Ronald F. Woodman, Jicamarca Radar Observa-
tory, Instituto Geofisico del Peru, Lima, Peru, October 1971, 45 pp, $4.00 (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.

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



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-37

UAG-38

UAG SERIES OF REPORTS (Continued)

[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 Haskell 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.

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.

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, (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 6. 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 £. Coffey, World Data Center A for Solar-Terrestrial Physics, NOAA, Boulder, CO, July
1973, 932 pp.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1968, by Joe Haskell Allen, Carl C.
Abston and Leslie D. 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. Supersedes catalogs UAG-11, 15 and 20.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(11) FOR 1969, by Joe Haskel] 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 I. 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-
jcal 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.

(Superseded by UAG-92]

AN ATLAS OF EXTREME ULTRAVIOLET FLASHES OF SOLAR FLARES OBSERVED VIA SUDDEN FREQUENCY DEVIA-
TIONS DURING THE ATH-SKYLAB MISSIONS, by R.F. Donnelly and E.L. Berger, NOAA Space Environment.
Laboratory; Lt. J.0. 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.

AURORAL ELECTROJET MAGNETIC ACTIVITY INDICES AE(10) FOR 1966, by Joe Haskell Allen, Carl C.
Abston and Leslie D0. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder,
CO, December 1974, 142 pp.

MASTER STATION LIST FOR SOLAR-TERRESTRIAL PHYSICS DATA AT WDC-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 0.F. Smart, Air Force Cambridge Re-
search Laboratories, Hanscom AFB, MA, December 1974, 110 pp.



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CATALOGUE OF CORONAL HOLES 1970-1991
by

A. Sanchez-lbarra
Centro de Investigacion en Fisica, Universidad de Sonora
Hermosillo, Sonora, Mexico
and
M. Barraza-Paredes
Centro de Investigacion en Astronomia Solar, CIAS
Hermosillo, Sonora, Mexico

1. INTRODUCTION

Coronal Holes were first noted as "M" regions that produced periodic geomagnetic
disturbances. These were first observed in 1970 by instruments on the Orbiting Solar Ob-
servatory (OSO) satellites, and also were noted with optical observations during the total so-
lar eclipse of March 7, 1970. The Apollo Telescope Mount (ATM) on the Skylab manned
mission observed in short wavelengths the real nature of Coronal Holes as regions of lower
density and temperature than the rest of the solar corona. Three observational periods from
Skylab produced substantial data on the development of Coronal Holes as well as their rela-
tionship with other types of solar activity.

After Skylab, although Coronal Holes were later deduced from radio observations, the
main data were obtained by observing the He | 10830A line at the Vacuum Solar Telescope
at Kitt Peak National Observatory. These data, continuous from 1977 to date, were pub-

lished in Solar-Geophysical Data (SGD) as Helium synoptic charts by Carrington Rotation or
as Coronal Hole contours plotted on H-alpha synoptic charts.

The Skylab observations of Coronal Holes were the subject of exhaustive examina-
tion. However, the main data source on Coronal Holes currently are the synoptic maps pub-
lished in SGD. This catalogue was motivated by the lack of a global reference guide. It In-
tends to help many statistical researchers by making it easier to work with more organized
information spanning a little more than one and a half solar cycles. Although this catalogue
is based only on summary data for each Carrington Rotation, it presents interesting values
and enough data to analyze several aspects of the evolution of Coronal Holes.





SYNODIC ROTATION NUMBERS 1970-1993

Carrington Date of Carrington Date of
Rotation Number | Commencement Rotation Number Commencement
Year | Month | Day Year | Month | Day
1801 1988 | APR | 11.6 1842 1991 | MAY | 4.8
1802 1988} MAY | 88 1843 1991 | JUN 14
1803 1988 | JUN | 5.0 1844 1991 | JUN | 28.7
1804 1988 | JUL 2.2 1845 1991 | JUL | 25.5
1805 1988 | JUL | 29.4 1846 1991 | AUG | 21.7
1806 1988 | AUG | 25.7 1847 1991 | SEP | 17.9
1807 1988 | SEP | 22.0 1848 1991 | OCT | 15.2
1808 1988 | OCT | 19.2 1849 1991 | NOV | 11.5
1809 1988 | NOV | 15.5 1850 1991 | DEC | 88
1810 1988 | DEC | 12.8 1851 1992 |_ JAN 5.2
1811 1989 | JAN 9.2 1852 1992 | FEB 1.5
1812 1989 | FEB | 55 1853 1992 | FEB | 28.8
1813 1989 | MAR | 48 1854 1992 | MAR _| 27.2
1814 1989} APR 1.7 1855 1992 | APR | 23.4
1815 1989 | APR | 28.4 1856 1992 | MAY | 20.7
1816 1989 | MAY | 25.6 1857 1992] JUN | 16.9
1817 1989] JUN | 21.9 1858 1992} JUL [14.1
1818 1989 | JUL | 19.1 1859 1992 | AUG | 10.3
1819 1989 | AUG | 15.3 1860 1992 | SEP 6.5
1820 1989 | SEP | 11.5 1861 1992] OCT | 38
1821 1989} OCT | 88 1862 1992 | OCT | 31.1
1822 1989 | NOV | 5.1 1863 1992 | NOV | 27.4
1823 1989 | DEC | 2.4 1864 1992 | DEC | 24.7
1824 1989 | DEC | 29.7 1865 1993 | JAN | 21.1
1825 1990 | JAN | 26.1 1866 1993 | FEB | 17.4
1826 1990 | FEB | 22.4 1867 1993 | MAR | 16.7
1827 1990 | MAR | 21.7 1868 1993 | APR | 13.0
1828 1990} APR | 18.0 1869 1993 | MAY | 10.3
1829 1990 | MAY | 15.3 1870 1993 | JUN | 6.5
1830 1990 | JUN | 14.4 1871 41993 | JUL | 3.7
1831 1990} JUL 8.6 1872 1993} JUL | 30.9
1832 1990 | AUG | 49 1873 1993 | AUG | 27.1
1833 1990 | SEP 41 1874 1993 | SEP | 23.4
1834 1990 | SEP | 28.4 1875 1993 | OCT | 20.7
1835 1990} OCT | 25.7 1876 1993 | NOV _| 17.0
1836 1990 | NOV | 22.0 1877 1993 | DEC | 14.3
1837 1990 | DEC | 19.3 1878 1994 | JAN | 10.6
1838 1991 | JAN | 15.6
1839 1991 | FEB | 12.0
1840 1991 | MAR | 11.3
1841 1991 | APR | 7.6

13



3. TYPES, IDENTIFICATION AND CLASSIFICATION CRITERIA
3.1 Types

Data spanning 21 years made it possible for us to recognize some of the Coronal
Holes behavior, and allowed us to classify and identify them. Coronal Holes are almost per-
manently visible on solar poles, except at the time of the maximum of solar cycle, when po-
larity inversion occurs. It is very common that coronal holes on solar poles expand to lower
solar latitudes, following a sector of equal polarity. Moreover, isolated coronal holes appear
at several latitudes at any time, connecting or disconnecting with holes prolongated from the
pole.

We classified coronal holes by two types: those which are an extension from the
Coronal Holes at the poles (Polar Coronal Holes), and those which are isolated at any lati-
tudes (Equatorial Coronal Holes).

Polar Coronal Holes were identified as such when they were extended below +60 de-
grees of heliographic latitude. Exceptions were made when the global polar coronal hole

passed below +60 degrees of latitude but did not produce a well-developed extension of the
hole.

Equatorial Coronal Holes were recognized as such when they were not connected
with any Polar Coronal Holes and were present at any latitude. Even during the polarity in-
version at the maximum of the cycle, Equatorial Coronal Holes were visible at very high lati-
tudes. Connections and disconnections between both kinds of Coronal Holes are noted in
the catalogue.

Based on this selection, the catalogue was divided in two parts, one for Polar Coronal
Holes and another for Equatorial Coronal Holes.

3.2 Identification

Both kinds of Coronal Holes were identified by a consecutive number following the
chronological order of apparition, and from higher to lower value of Carrington Longitude
(from 360 to 00 degrees), independent of their heliographic latitude. When two Coronal
Holes coincided in the Carrington longitude, we first classified the Coronal Hole visible in the
Northern Hemisphere, and then the one in the Southern Hemisphere. The identification
given to the Coronal Holes observed by Skylab (Bohlin and Sheeley, 1978) are noted in the
remarks.

The identification of the hole when it persisted for two or more Carrington Rotations
was more complex. The main criteria to recognize the same Coronal Hole as such was the
displacement of photospheric sectors of the main polarity. This also let us identify Coronal
Holes when they had a strong drift both in heliographic latitude or longitude. So, the evolu-



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19


WORLD DATA CENTER A
for
Solar-Terrestrial Physics

REPORT UAG-102

CATALOGUE OF CORONAL HOLES
1970-1991

October 1992

NATIONAL GEOPHYSICAL DATA CENTER

B = BOOT R = RAMFIED P = POINTED


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42


4.4 Heliographic latitude -- Heliographic Latitude
Heliographic latitude of the hole measured at the middle point between its northern and
southern limits.

4.5 Carrington longitude -- Carrington Longitude
Carrington longitudes of the hole measured at the middle point between its eastern and
western limits.

4.6 Extension in heliographic latitude -- Extent in Latitude
Extension measured in degrees on the northern and southern limits of the hole.

4.7 Extension in Carrington Longitude -- Extent in Longitude
Extension measured in degrees on the eastern and western limits of the hole.

4.8 Polarity -- Polarity
Magnetic polarity of the hole, based on the dominant polarity of the polar hole (if it is a Polar
Coronal Hole) or in the polarity of the sector (if it is an Equatorial Coronal Hole).

4.9 Shape -- Shape
Shape classification of the hole. See page 4 or Figure 1 on page 5.

4.10 Remarks -- Remarks
The remarks are spelled out here. However, these data are available in digital form from
WDC-A for STP or from the author. Remarks are compressed with the following definitions:

4(...) Related to...(hole identification).

2(...) Connected to...(hole identification).

3(...) Disconnected from...(hole identification).

4(...) Reapparition of...(hole identification).

5 Uncertainty in position.

6 The hole drifted to the next Carrington rotation, based on its longitude and latitude.

7 The hole drifted to one Carrington rotation before. It is labeled based on its longitude.

8 Uncertainty in drawing, mostly when photographic synoptic charts were used for
identification.

9 Deduced -- When the Coronal Hole was identified based on the drift of the
photospheric sector deduced by the evolution of the magnetic sector.

10(...) Strong development (hole identification).

11 Only Carrington Longitude drifted to next Carrington rotation.

12 No data.

5. COMPUTED PARAMETERS

Measurements of Coronal Holes were made on the position and the extension over
boundaries marked in the synoptic charts. Both heliographic latitude and Carrington longi-


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Fig. 1. We show the five Shape Classifications of the Equatorial Coronal F Holes and the
eight Shape Classifications of the Polar Coronal Holes.


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syewiad

62


2. DATA SOURCES

All the data used for this catalogue were taken from synoptic charts based on Carring-

ton rotations. To determine the polarity of every Coronal Hole, and to identify it over several
Carrington rotations, the contours of Coronal Holes were copied to H-alpha synoptic charts,
although measurements were made on the original source. Magnetograms from Kitt Peak
National Observatory were also used for this purpose.

For Carrington Rotation 1558, Coronal Holes were plotted on H-alpha synoptic charts
based on spectroheliographic observations made from OSO-6, and also from observa-
tions made during the total solar eclipse of March 7, 1970 (Webb et al., 1984)

Data of Coronal Holes observed in Carrington Rotation 1568 are also based on obser-
vations from OSO-7 (Maran et al., 1973).

Coronal Hole data for Carrington Rotation 1601 to 1610 were obtained from contours
plotted in H-Alpha synoptic charts, based on X-ray observations from Skylab (Hanson et
al., 1980; Bohlin et al., 1978).

Data for Carrington Rotation 1623-27 and 1633-35, were provided by J. Harvey as sy-
noptic maps taken from He | images.

Coronal Hole data for Carrington Rotation 1628-32, 1636-39, 1645-47, and 1649, were
taken from He | synoptic maps which appeared in SGD.

Data for Carrington Rotation 1650-1715 were published in SGD as synoptic maps.

From Carrington Rotation 1716 to 1828, Coronal Holes data were taken from contours
plotted on H-alpha synoptic charts published in SGD (no data for Carrington Rotation
1807).

Synoptic maps for Carrington Rotation 1830-1849 were provided by J. Harvey of NSO
(with no data for Carrington Rotation 1829, 1834, 1841, and 1845).

All that data were contrasted with the Atlas of Stackplots Report UAG-101 (Mcintosh, 1991),
including data for several Carrington Rotation missed in the sources mentioned above.

In summary, data of Coronal Holes were obtained for 234 Carrington rotations span-

ning 21 years of observations. Data for nine Carrington rotations were lost because of the
time when ground-based observations started. See Table 1 on page 9. Table 2 on pages
40-13 lists the dates of commencement of Carrington rotations 1557-1878 covering the years
1970-1991.



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64


Carrington
Rotation

Table 1. DATA SOURCES

SOURCE

1658
1601-1610

1623-1628
1629-1632
1633

1634-1635
1636-37
1638

1639
1640-1641

1642
1643-1644
1645-1647
1648
1649-1796

1797-1805
1806
1807
1808-1828
1829

1830
1831
1832-33, 1835-40
1841
1843-44, 1846-49

Webb, Davis, and Mcintosh, 1984; Maran and Thomas, 1973; SGD
Roelof and Gold, 1980; Bohlin and Sheeley, 1978; Mcintosh, 1991;
SGD.

Harvey, NSO; SGD.

McIntosh, 1991; SGD.

Harvey, NSO.

Harvey, NSO; Mcintosh, 1991; SGD.
Mcintosh, 1991; SGD.

Harvey, NSO.

Mcintosh, 1991.

No data.

Mcintosh, 1991.

No data.

McIntosh, 1991; SGD.
No data.

Mcintosh, 1991; SGD.

SGD.

Harvey, NSO.
No data.
SGD.

No data.

Harvey, NSO.
SGD.

Harvey, NSO, (No data for 1834).
Harvey, NSO; SGD.

Harvey, NSO, (No data for 1845)



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57


SYNODIC ROTATION NUMBERS 1970-1993

Carrington Date of Carrington Date of
Rotation Number | Commencement Rotation Number | _Commencement

Year | Month | Day | Year | Month | Day
1637 1976 | JAN | 12.3 1678 1979| FEB | 36
1638 1976 | FEB 8.6 1679 1979 | MAR | 3.0
1639 1976 | MAR | 7.0 1680 1979 | MAR | 30.3
1640 1976 | APR | 3.3 1681 1979 | APR | 26.5
1641 1976 | APR | 30.5 1682 1979 | MAY | 23.8
1642 1976 | MAY | 27.8 1683 1979 | JUN | 20.0
1643 1976 | JUN | 24.0 1684 1979 | JUL | 17.2
1644 1976 | JUL | 21.1 1685 1979 | AUG | 13.4
1645 1976 | AUG | 17.4 1686 1979 | SEP 9.6
1646 1976 | SEP | 13.6 1687 1979| OCT | 69
1647 1967 | OCT | 10.9 1688 1979 | NOV | 3.2
1648 1976 | NOV 7.2 1689 1979 | NOV | 30,5
1649 1976 | DEC | 4.5 1690 1979 | DEC | 27.8
1650 1976 | DEC | 31.8 1691 1980 | JAN | 24.2
1651 1977 | JAN | 28.2 1692 1980 | FEB | 20.5
1652 1977 | FEB | 24.5 1693 1980 | MAR | 18.8
1653 1977 | MAR | 23.8 1694 1980 | APR | 15.1
1654 1977 | APR | 20.1 1695 1980 | MAY | 12.4
1655 1977 | MAY | 17.4 1696 1980 | JUN 8.6
1656 1977 | JUN | 13.6 1697 1980 | JUL 5.8
1657 1977 | JUL | 10.8 1698 1980 | AUG | 2.0
1658 1977 | AUG | 7.0 1699 1980 | AUG | 29.2
1659 1977 | SEP 3.2 1700 1980 | SEP | 25.5
1660 1977 | SEP | 30.5 1701 1980 | OCT | 228
1661 1977 | OCT | 27.8 1702 1980} NOV | 19.1
1662 1977 | NOV | 241 1703 1980 | DEC | 16.4
1663 1977 | DEC | 21.4 1704 1981 | JAN | 12.7
1664 1978 | JAN | 17.7 1705 1981 | FEB 9.4
1665 1978 | FEB {141 1706 1981 | MAR | 8.4
1666 1978 | MAR | 13.4 1707 1981 | APR | 47
1667 1978 | APR | 97 1708 1981 | MAY | 2.0
1668 1978 | MAY | 69 1709 1981 | MAY | 29.2
1669 1978 | JUN 3.2 1710 1981 | JUN | 25.4
1670 1978 | JUN | 30.4 1711 1981 | JUL | 226
1671 1978 | JUL | 27.6 1712 1981 | AUG | 18.8
1672 1978 | AUG | 23.8 1713 1981 | SEP {| 15.1
1673 1978 | SEP | 20.1 1714 1981 | OCT | 12.4
1674 © 1978 | OcT | 17.3 1715 1981 | NOV 8.6
1675 1978 | NOV | 13.6 1716 1981 | DEC | 6.0
1676 1978 | DEC | 10.9 1717 1982 | JAN 2.3
1677 1979| JAN | 7.3 1718 1982 | JAN | 29.6

1



WORLD DATA CENTER A
for
Solar-Terrestrial Physics

REPORT UAG-102

CATALOGUE OF CORONAL HOLES
1970-1991

by

A. Sanchez-lbarra
Centro de Investigacion en Fisica
Universidad de Sonora
Hermosillo, Sonora, Mexico
and
M. Barraza-Paredes
Centro de Investigacion en Astronomia Solar, CIAS
Hermosillo, Sonora, Mexico

October 1992

Published by
World Data Center A for Solar-Terrestrial Physics
National Geophysical Data Center

325 Broadway, Boulder, CO 80303 USA


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for Solid-Earth Geophysics
NOAA, NGDC E/GC1
325 Broadway
Boulder, Colorado 80303-3328 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.


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tude of each hole were measured in the middle points of their north-south and east-west
boundaries.

Extensions or ramifications of the holes that represented less than 1/6 of their size
both in latitude or longitude were not taken into account as an edge of the boundary. Lati-
tudes N60 and S60 were always at the highest limits for measurements for heliographic lati-
tude and extensions of Polar Coronal Holes. The precision of the measurements is about +1
degree. When boundaries were uncertain, it was noted. Extensions in both heliographic
latitude and longitude were based on the same limits.

There are plans to extend this catalogue every two years on the same basis.

6. ACKNOWLEDGMENTS

We gratefully acknowledge Dr. J. Harvey who provided us with several synoptic maps
including those that were unpublished when he started identifying Coronal Holes on Helium
images. The National Solar Observatory of NOAO kindly permitted us access to their files.
Also we acknowledge the revisions and assistance of P. Navarro, A. Cruz, M. Ayala, M.A.
Norzagaray, M. Pedroza, C. Calcaneo, and M. Ruiz.

7. REFERENCES

BOHLIN, J.D. and 1975 "Synoptic Maps of Solar Coronal Hole Boundaries

D.M. RUBENSTEIN derived from He 11 304 A Spectroheliograms from
the Manned Skylab Missions", Report UAG-51,
NOAA, World Data Center A for Solar-Terrestrial
Physics, NOAA, Boulder, Colorado, USA 80303-

3328, 21 pp.
BOHLIN, J.D. 1977 "Extreme-Ultraviolet Observations of Coronal

Holes, Solar Phys, 51, 377-398.
BOHLIN, J.D. and 1978 “Extreme-Ultraviolet Observations of Coronal Holes"
N.R. SHEELEY, JR. Solar Phys., 56, 125-151.
HANSON, J.M., 1980 "Solar Observations During Skylab (April 1973 -
E.C. ROELOF, and February 1974)", Report UAG-79, NOAA, World
R.E. GOLD Data Center A for Solar-Terrestrial Physics, Boulder,

Colorado, USA 80303-3328, 43 pp.



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47


Table2. SYNODIC ROTATION NUMBERS 1970-1993
Carrington Date of Carrington Date of
Rotation Number | Commencement Rotation Number | Commencement

Year | Month | Day | Year | Month | Day
41557 1970 | JAN | 21.3 1597 1973 |_ JAN | 16.3
1558 1970 | FEB | 17.6 1598 1973 | FEB | 12.6
1559 1970 | MAR_| 17.0 4599 1973 | MAR_| 12.0
1560 1970 | APR | 13.3 1600 1973 | APR_| 83
1561 41970 | MAY | 10.5 1601 1973 | MAY | 5.5
1562 1970 | JUN | 67 4602 1973 | JUN | 1.7
1563 1970 | JUL 3.9 1603 1973 | JUN | 28.9
1564 1970 | JUL | 31.1 1604 1973 | JUL | 26.1
1565 1970 | AUG | 27.3 1605 1973 | AUG | 22.4
1566 1970 | SEP_| 23.6 1606 1973 | SEP | 18.6
1567 1970 | OCT | 20.9 1607 1973 | OCT | 15.9
1568 1970 | NOV_| 17.2 1608 1973 | NOV_| 12.2
1569 1970 | DEC | 14.5 1609 1973 | DEC | 9.5
1570 1971 | JAN | 10.8 41610 1974| JAN | 5.8
1571 1971 | FEB | 7.2 1614 1974| FEB | 2.2
1572 1971 | MAR | 6.5 1612 1974 | MAR _| 1.5
1573 4971 | APR | 2.8 1613 1974 | MAR | 28.8
1574 1971 |_APR_| 30.1 1614 1974 | APR _| 25.1
41575 1971 |_MAY_| 27.3 1615 1974 | MAY_| 22.3
1576 1971 | JUN | 23.5 1616 1974 | JUN | 18.5
1577 1971 | JUL | 20.7 1617 1974 | JUL | 15.7
1578 1971 | AUG | 16.9 1618 1974 | AUG | 11.9
1579 1971 | SEP _| 13.2 1619 1974 |_SEP 8.2
1580 1971 | OCT | 10.5 1620 1974 | OCT | 5.5
1681 1971 | NOV | 6.8 1621 1974 | NOV _| 1.8
4582 41971 | DEC | 4.1 1622 1974 | NOV_| 29.1
1583 1971 | DEC | 31.4 1623 1974 | DEC | 26.4
1584 1972 |_ JAN | 27.7 1624 1975 | JAN | 22.7
1585 1972 | FEB | 24.1 1625 1975 | FEB | 19.1
1586 1972 | MAR _| 22.4 1626 1975 | MAR_| 18.4
1587 1972 | APR | 18.7 1627 1975 | APR | 14.7
1588 1972 |_ MAY | 15.9 1628 1975 | MAY | 11.9
1589 1972 |_ JUN | 12.1 1629 1975 |_ JUN 8.1
4590 1972 | JUL | 9.3 1630 1975 | JUL | 5.3
1591 1972 | AUG | 5.5 1631 1975 | AUG | 1.5
1592 1972 |_SEP 1.8 1632 1975 | AUG | 28.8
1593 1972 | SEP | 29.0 1633 1975 | SEP | 25.0
1594 1972 | OCT | 26.3 1634 1975 | OCT | 22.3
1595 1972 | NOV_| 22.6 1635 1975 | NOV | 18.6
1596 1972 | DEC | 20.0 1636 1975 | DEC | 15.9

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