COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES", 1975-1979 (continued)

TIME (UT) McMATH Ha FLARE comp .
OF FLARE Ha PLAGE PROFILE FLARE
DATE oR Evenrtt POSITION IMP. NUMBER abcde INDEX REMARKST
1979
1615-1656 NLSEI9 1b 15830 GB,10cm flux = 1945; 1V(M);
Feb 18 ~and 21333 2 ILIG,V(DCM,M,DKM) ; Simu1~
635-1704 NI7W14 1b 15823 taneous great radio flares
with common max. at 1642
vr.

20 © (0934) 00010 1 IL(M);1IIg(M); No flare
reported.

20° 1725-1845 NO3W32 1b 15828 11120 5 II(M)5I and CONT(M).

1720 1b 15830 11222 8 10 cm flux = 162; IE(M);

20 I and CONT(M).

N17 w42 sn 15823 10202 5

20 N20W45 In 15823 11220 6 10cm flux = 230;I1(M),IS,
DC,CONT(M).

22 0503-0537, N18W33 sb 15830 302_0 a5 10cm flux = 243;No Dyn.Sp.
data.

25 0638-0852 $2060 In 15849 11231 8 10cm flux = 110;1T and IV
(mM); ILIG(DCM,M,DKM) «

Mar 1 0955-1110 $23E58 3n 15856 33212 u 10cm flux = 350;11(M);
TIIg(4).
0935-1053 NI7E80 In 15874 21232 10 10cm flux = 525;11(M);1V

9 and (DCM);A11 major bursts are

1019-1027 N36W72 ef 15860 20232 9 common to either flare.

11 0650-0747 N20871 1b 15877 11010 3 IL(M) 11 Tg (mM).

Mi (1935-105 824076 In 15856 11110 4y IL(M), 1054-1059 UT;

1056-1108 —-N19ES7 In 15874 11010 3 T1IG(M).

20 2300-2405 — s25w13 sf 15902 10110 3 II(M) 5 I1Tg(DCM,M) «

21 (o2aey 00213 6 10cm flux = 133; 11(DCM,M);
IIIG,U(DCM,M);No flare re-
ported.

22 0324-0355 NO7W19 Ib 15887 31100 No Dyn.Sp. events reported
with this major SID.

22 1811-1837 NO6E66 sb 15904 10111 4 TE(M) 5 ITTG(DCM,M) «

23 0640-0700 + noBE62 ib 15904 21213 9 10cm flux = 276;II(DCM,M);
TIIG(DCM,M).

26 1150-1247 NOSW78 2b 15887 22202 8 GB,10cm flux = 519; No Dyn
Sp. events reported.

27 0604-0610 —-NO7W90 In 15887 30201 6 10cm flux = 104;IN,DC(M);
Major SID of long dur.

(3 hours).

27 (0811) 00113 5 IL(DCM,M) ; LT g,U(M) 5
No flare reported.

27 (1108) 00012 3 II(M); No flare reported.

27° 1122-1156 $25E79 In 15918 11120 5 IL & CONT(M);1IIg(M).

30 0033-0042 NL1W43, sb 15904 00010 1 I1(M); LIIG(DCM,M).

Apr 3 0105-0230 $25W14 1b 15918 21232 10 10cm flux = 47531V(DCM,M);
ILIg(DCM,DKM) .

8 1844-1854 —NI9ES1 sb 15933 10010 2 TI(M) 3 1T1g(DCM) .

9 ‘T216-1316 © NOSES7 1b 15937 31000 4 No radio events reported
with this major SID.

10 2040-2044 — NISW75 sf 15939 00010 1 TQ).

12 C1330) 00010 1 II(M); No flare reported.

13 0703-0709 N21W07 sf 15933 00010 1 m0n).

14 1440-1453 NO4EOB 1b 15937 11233 10 10cm flux = 170; IL(M);
‘IV(M) ; ILIG,V(DCM,M,DKM) 5
A strong “radio flare” at
all wavelengths.

15 2006-2035, Na3wiL ef 15933 10214 8 II(M) 3 LEIG,V ,U(DCM,M,DKM) 5

2007-2025 NO4WO6 ib 15937 11214 9 10cm flux = 116

22 @23r1) 00110 2 IL(M);ITIS(M);No flare re~
ported.

23° (0148) 00031 4 IL & IV(M);IN(M);No suit-
able prior flare reported.

26 ©2001-2048 —-NI2E31 1b 15967 11120 5 IX(M); CONT(M) ; IITg(DCM) .

27 0633-0731 NI8EI7 1b 15967 31234 13 GB,10cm flux - 718;I1 & IV
(DCM,M) 5 LLIG(DCM,M); A
great “radio” flare at all
wavelengths.

29 {0730-0759 —NI7ESO sb 15974 10223 8) 10cm flux = 147; 11(M);CONT

0735-0826 N12W01 In 15967 11010 3 (Dem) ; LTTG(DeM,M) «
May 2 1649-1708 — s25W35 sn 15968 20221 7 IL(M,DKM) ; CONT(M) 3 ITTg,V
N20W55 2b 15967 22221 9 (DCM,M, DRM).

See notes to Table 1 on page 20.

16



UAG~49

UAG-50

UAG-51

UAG-52

UAG-53

UAG-54

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

"Catalog of Standard Geomagnetic Variation Data," prepared by NOAA Environmental Data Service, Boulder, CO,
August 1975, 125 pp, $1.85.

“High-Latitude Supplement to the URSI Handbock on Ionogram Interpretation and Rediction," edited by WR.
Piggott, British Antarctic Survey, c/o Appleton Laboratory, Slough, UK, October 1975, 294 pp, $4.00.

"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, $0.54.

“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, $0.60.

"Description and Catalog of Ionospheric F-Region Data, Jicamarca Radio Observatory (November 1966 - April
1969), by WL. Clark and T.E. Van Zandt, NOAA Aeronony Laboratory, Boulder, CO, and J.P. McClure, University
of Texas as Dallas, Dallas, TX, April 1976, 10 pp, $0.33.

"Catalog of Ionosphere Vertical Soundings Data," prepared by NOAA Environmental Data Service, Boulder, CO,
April 1976, 130 pp, $2.10,

“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. Kroehl, Data Studies Division, National Geophysical 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, Geophysical Institute, University of Alaska, Fairbanks, AK, April 1976, 91 pp,
$1.60 (microfiche only).

"Tso-intensity Contours of Ground Magnetic H Perturbations for the December 16-18, 1971, Geomagnetic Storm,"
Y. Kamide, Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO,
April 1976, 37 pp, $1.39.

“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, $1.04.

"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 Allen, Carl C.
Abston Fe Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder, CO, duly 1977,
57 pp, $1.07.

"Collected Data Reports for STIP Interval II 20 March - 5 May 1976, edited by Helen E. Coffey and John A.
McKinnon, 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 Allen, Carl C.
Abston and Leslie 0. Morris, National Geophysical and Solar-Terrestrial Data Center, Boulder, CO, September
1977, 55 pp, $1.11.

“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, $1.11.

“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, $1.00.

"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, $0.75.

“Synoptic Radio Maps of the Sun at 3.3 mm 1970-1973," by Earle B, Mayfield and Fred I, Shimabukuro, Aerospace
Corp., £1 Segundo, CA, May 1978, 30 pp, $0.75.

“Ionospheric D-Region Profile Data Base, A Collection of Computer-Accessible Experimental Profiles of the D
and Lower E Regions," by L.F. McNamara, lonospheric Prediction Service, Sydney, Australia, August 1978, 30
pp, $0.88 (microfiche only).

“A Comparative Study of Methods of Electron Density Profile Analysis," by L.F. McNamara, Ionospheric
Prediction Service, Sydney, Australia, August 1978, 30 pp, $0.88 (microfiche only).

"Selected Disturbed D-Region Electron Density Profiles. Their relation to the undisturbed D region," by L.F.
McNamara, Ionospheric Prediction Service, Sydney, Australia, October 1978, 50 pp, $1.29 (microfiche only).

“Annotated Atlas of the H-alpha Synoptic Charts for Solar Cycle 20 (1964-1974) Carrington Solar Rotations
1487-1616," by Patrick S. McIntosh, NOAA Space Environment Laboratory, Boulder, CO, February 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-Terrestrial Data Center,
Boulder, CO; M.A. Henning, Lockheed Missils 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 February - 1
March 1979, Cambridge, Massachusetts, U.S.A.," edited by David M, Rust, American Science and Engineering,
Inc., Cambridge, MA, and A. Gordon Emslie, Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, July
1979, 68 pp, $1.50 (microfiche only).

37

i
|
i
E
i
i



APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)

‘TIME (UT) McMATH Ho FLARE COMP.
OF FLARE, Ha PLAGE PROFILE FLARE
DATE © OR EVENT = POSITION IMP. NUMBER abede INDEX REMARKS
1979
Dec 3 1514-1640 — S24B54 2b? 16476 12100 “4 No dynamic spectrum
events reported.
4 0438-0536 $1732 In 16467 21000 3 IIIg(DCM) .
4 (o956y 00200 2 10cm Flux = 165; No flare
or SID reported.
7 0151-0240 s25W23 2b 16465 02100 3 No dynamic spectrum events
reported.
10 (1603) 00200 2 10cm flux = 205; No flare
or SID reported.
13 0915-0930 NIOE41 sb 16527 00030 3 IV(DCM), Duration 7 min.
14 | 0613-0630 NIL2E46 2b? 16515 12203 8 10cm flux = 107; ILIG, V
0615-0632 © S16W29 1b 16495 11203 7 (DCM,M,DKM) «
uw cgy 00030 3 Iv(DCM), Duration 7 min.;
TIIG(DCM,M); No flare or
SID reported.
21 2003-2640 N20E55 2£2 16540 02100 3 ILIg,U(M) ;18(DeM) .
22 0511-0604 —S18E53 2n 16541 22100 5 No dynamic spectrum events
reported.
23° 0440-0525 SO7H64 2b 16522 02001 3 IIID(M,DKM)
23° 0720-0735 «= so6w64 2b? 16522 22000 4 No dynamic spectrum events
reported,
28° 2137-2154 S17 W87 sf 16529 20100 3 ILIg(DCM,M,DKM) ; TLIN(M) .
29 SL6W86 sn 16529 20000 2 II1g(DCM,M,DKM)

33



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES", 1975-1979 (continued)

‘IL(M);LV(DCM,M);II1G(DCM,
M,DKM);10 CM Flux = 103.
II(M) ; LTIG(M,DKM); No
flare reported.

II(M);No radio bursts re-

IL(M) ; LIZG(DCM,M); Flare
data are incomplete.
GB, 10 CM Flux = 4500;
TL(M); ILIG,V(DCM,M,DKM)
No flare reported.

IL(M,DKM) ; CONT(DCM,M)
ILIG,V(M,DKM);No flare

GB,10 CM Flux = 3800;

GB,10 CM Flux = 24,000;11
and IV(DCM,M);IIIG(M) 3A
very great “radio flare”
at all wavelengths.

GB,10 CM Flux = 3585511
(M) ; IV(DCM,M,DKM) IIIS(M,
DKM);A great “radio
flare” at all wavelengths
GB,10 CM Flux = 1900311
(M,DKM) ; IV(DCM,M) ; LIIG(M)
A great “radio flare” at
all wavelengths.

TILA) 5 111g (M,DKM)

GB,10 CM Flux = 1665311
(4) ; LV(DCM,M) ; LLIG(DCM,,
M,DKM) ; IC(M,DKM);A strong
“radio flare".

TL(M) ; IV(DCM,M); ILIG,V
(DCM,M,DKM);Strong radio
bursts at M wavelengths.
II(M),But questionable;

TL(DOM)?; 111g and LLIN(M)
TI(M); LLIG ,V(DCM,M) 5
Strong radio burets at M

10 CM Flux = 192;1V(DCM)
ILIG,¥(DCM,M,DKM) .

IE(M) 5 LLIG ,V(DCM,M,DKM)
Strong radio bursts at
DCM and M wavelengths.
IV(M) 5 ILIG v(m)
TL(DCM,M) ; ITTg(DCM) ; IS DC
(M);No flare or radio
bursts reported.

10 CM Flux = 150;11(pcM,
M,DKM) ; 1V(DCM) IIIg(M,DKM)
No flare patrol 1833-2230

GB,10 CM Flux = 770311
(DCH, M) 3 1V(DCM,M,DKM)A
great “radio flare” at
all wavelengths.

10 CM Flux = 110;11(M,
DKM) ; IV(DCM,M) ; IIIG,V
(DCM,M,DKM) .

IZ and IV(DCM,M);IIIg
(M,DKM);No flare reported

10 CM Flux = 114511 and
IV(DCM,M) 5 I11g(M) 5A
strong “radio flare",
especially at DCM and
M wavelengths.

TIME (UT) McMATH Ha FLARE COMP.
OF FLARE Wa PLAGE PROFILE FLARE
DATE OR EVENT tt POSITION IMP, NUMBER abcde INDEX REMARKS
1978
Apr 18 0104-0148» NL4W45 1b 15235 21232 10
19 (0542) 00010 1
20 2229-2239 N20W60 sf 15235 00010 1
ported.
21 0805-0825 N24WS5 sn 15254 20112 6
23° (0422) 22311 9
Culgoora radioheliograph places source at 1.1 RO, PA. O° to 55°
(Probably active region 15266 on invisible hemisphere, just be-
yond East limb.)
23 (2018) 20122 7
reported.
25 1535-1655 NIBE72 1b 15266 21300 6
= TLIG(DCM)
28 1304-2232 -N22E38 3b 15266 33435 18
29° 2010-2211 N20E14 2b 15266 32334 15
30 1420-1859 -N2BE14 3b 15266 33333 15
May 1 0538-0620 —_N29E01 en 15266 0010 1
T910-2230 © -N21W12 2b 15266 22333 13
2 0048-0209 N26E03 en 15266 20133 9
2 0345-0413 N30WOS In 15266 11110 4
TLIg(M) .
2 0514-0530 —-N25E01 sf 15266 00011 2
2 O6I4-0625 — S26E78 sn 15280 10113 6
(@receded by sf flare at N35E19 in region 15266)
wavelengths.
2 0635-0710 = N29w12, 1b 15266 11232 9
2 1610-1615 827872 sb 15280 00113 3
3 1211-1242 -N22W27 sf 15266 10030 4
4 (0457) 00011 2
Culgoora radiograph places source at 1.2 RO, P.A. 25°
(probably from region 15266)
4 1206-1240 N22048 sf 15266 00010 1 TICM) 5 INC)
6 C019) 2-233 210
ur.
7 0327-0353 N23W72 In 15266 31234 B
7 1544-1626 N20W68 In 15266 21232 10
8 (0155) 10132
Gulgoora radioheliograph places source at 1.0 RO, P.A. 290°
(Active region 15266 going over west limb)
8 1212-1312 -N22W76 1b 15266 21234 12
9 (0625) 00010 1

See notes to Table 1 on page 20.

10

TL(M);Also IV(M), 4 min
duration. No flare re~
ported.



NOTES TO TABLE 1:

abede

tt

This list of “major” flares includes all flares that satisfied any one
of the five criteria stated in section 2 of this report.

The successive entries in the column titled “Ha Flare Profile" refer
respectively to evaluations of the ionizing radiation, the Ha flare,
the ~ 10 cm flux, the type of event in the dynamic spectrum and
the ~ 200 MHz flux. See section 1 of this report. A dash (-)
appearing in the profile set indicates “no observations” were available
for that particular entry.

When no flare or subflare was reported, the beginning time of the SID

or radio frequency event is shown in parentheses.

A question mark following the index value indicates a Type IV event
that is questionable for either duration or conflicting reports.

In the remarks column, the following abbreviations have been used:
DCM,M,DKM = decdmetric, metric, and dekametric events in the dynamic
spectrum; BO (Boulder), CLG (Culgoora), DURN (Durnten), DWIN (Dwin~
geloo), H (Ft. Davis), MAN (Manila), SAG (Sagamore Hill), WEIS

(Weissenau) = stations reporting dynamic spectrum events.

20



UAG-73

UAG-74

UAG-75,

UAG-76

UAG-77

UAG-78

UAG-79

UAG-80

“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-Terrestrial Data Center, NOAA, Boulder, CO,
August 1979, 114 pp, $1.75.

“ATS-6 Radio Beacon Electron Content Measurements at Ootacamund, India, October - July 1976," by S.D. Bouwer,
K. Davies, ReF. 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, $2.50.

"The Alaska IMS Meridian Chain: 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.-I 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, June 1980, 107 pp, $3.00.

“auroral Electrojet Magnetic Activity Indices AE(12) for July - December 1975," by Joe Haskell Allen, 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, Jr. and R.A. Howard, 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 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," by Helen W.
Dodson and E. Ruth Hedeman, The Johns Hopkins University, Laurel, MD, July 1981, 33 pp, $2.00.

38

i
Hq



EXPERIMENTAL COMPREHENSIVE SOLAR FLARE INDICES FOR “MAJORTM AND CERTAIN LESSER FLARES, 1975~1979

Compiled by
Helen W. Dodson and E. Ruth Hedeman
The Johns Hopkins University
Applied Physics Laboratory
Laurel, Maryland 20810

Based in part on data collected at the former
McMath-Hulbert Observatory of
The University of Michigan

1, INTRODUCTION

In July 1971 a report on “An Experimental, Comprehensive Flare Index and its Derivation for 'Major' Flares,
1955-1969" was published by the present authors as Report UAG-14 of World Data Center A for Solar-Terrestrial
Physics. The index apparently proved to be a useful tool for some investigators, and values of thé indices for
the later years, 1970-1974, were published in Report UAG-52, “Experimental Comprehensive Solar Flare Indices for
Certain Flares, 1970-1974". Requests have been received for values of the Comprehensive Flare Index (CFI) for
still later years. Accordingly, the present report has been prepared for 1975 through 1979, years that complete
data for solar cycle 20 and provide information for the ascending branch of cycle 21. (For November-December
1979, it was necessary to use preliminary summaries of flare data, Final Ha flare evaluations were not available
for these months at the time of preparation of this report.)

We continue to point out the experimental nature of the index and to recognize its imperfections, but its use
and availability for almost a decade have introduced a certain gratifying ease in the handling of extensive flare
data. Comprehensive flare indices, and the profiles on which they are based, for the so-called “major” flares,
permit one to identify easily flare~events that were well above average in some or all aspects of the electromag-
netic spectrum (ionizing, optical, and radio frequency radiation). In spite of changing observing and reporting
techniques, over the years, it is our belief that Reports UAG-14 and 52 and the present study, together present
relatively complete and homogeneous information about the truly greatest flares (i.e., CFI> 10) in the last 25
years (see Report UAG~52, page 19 and part 4 of this study). For “major” flares with CFI's < 10, modifications in
the observing and reporting programs (primarily of Type II bursts) have introduced certain unavoidable inhomogenei-
ties in the number of events qualifying for inclusion in the lists of so-called “major” flares.

The five components that comprise the “profile” of the flare are listed below. The sum of the five compo-
nents gives the Comprehensive Flare Index (CFI).

a Importance of ionizing radiation as indicated by time-associated Short Wave Fade or Sudden Ionospher-
ic Disturbance;* (Scale 0-3).

b. Importance of Ha flare; (Scale 0*#-3).

c Magnitude of ~ 10 om flux; (characteristic of log of flux in units of 10~22wm@u27!),

a. Dynamic spectrum; (Type II = 1, Continuum = 2, Type IV with duration > 10 minutes = 3).

e. Magnitude of ~ 200 Miz flux; (characteristic of log of flux in units of 10-22wm Hz).

* Prior studies reported in UAG-52 indicated a close relationship between the importance of the SID and the peak
x-ray flux for major flares. The two values increase together. Accordingly we have continued to use the magni-
tude of the SID as a measure of the ionizing radiation.

*#Ha subflares are evaluated as of importance "0".

2. COMPREHENSIVE FLARE INDICES FOR "MAJOR" FLARES

In the present study, as in the two earlier reports, values of the Comprehensive Flare Index have been
derived for flares that are considered to have been well above average in either ionizing, Ha , or radio frequency
radiation. Specifically, the index has been determined for all flares in the years 1975-79 that satisfied any one
of the following criteria: ~—

Short wave fade (or Sudden Ionospheric Disturbance), importance > 3.
Ha Flare, importance > 35 2, -1

10 cm Flux, > 500 x 10°°“wm Hz").

Type II burst.

Type IV radio emission, duration > 10 minutes.

Each flare that satisfied at least one of the above criteria can, in some sense, be considered to have been a
“major” flare and is so referred to in this report. ‘The times of these "major" flares, with their respective
profiles and comprehensive indices, are listed in Table 1 (at the end of the text). In this table, the reported
time refers to the Ha flare or subflare, when known. When no Ha event has been reported, a nominal time is given
in parentheses and refers to the approximate time of the short wave fade or the radio frequency emission. Careful



APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)
TIME (UT) MeMATH Ha FLARE coMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE OR_EVENT POSITION IMP. NUMBER abcde INDEX REMARKS
1979
Jul 16 (1755) 00200 2 10 cm flux = 155; No
flare or SID reported.
23 0457-0800 N28W90 2n 16160 02000 2 No SID or single freq.
events reported.
24 0725-0835 N31N31 In 16156 21101 5 IZIN in prog.
Aug 1 1115-1205 $13E04 sb 16175 20100 3 TLIb(DCM) .
2a $13H02 en 16175 20100 3 TIIb(M).
S23E41 sb 16225 20100 3 TIg(DCM)
NOSES7 en 16239
| 00020 2 I and CONT(M).
$32E56 en 16241
NO4ES7 sf 16239
S32E55. sn teat] 00020 2 IS ,CONT(M);IIIg,U(M).
82722 sn 16224
N2BWw22 sf 16237 00024 6 CONT(M) ; IIIG,V(M).
N1BE62 1b 16252 11020 4 IS ,C(M);i11g,V(M,DKM) «
NI7E63 an 16252 00020 2 CONT(M);11Zg(M) «
Sep 7 .0425-0508 — N21W72 2n 16252 12000 3 ILIG,V(M,DKM) 5 18(M) .
8 0645-0711 —S22686 ln 16271 21100 4 ILIG(DGM,M);I1S(M).
11 D950-T02T = NL1E31 en 16279 00132 6 Iv(DCM), Duration 4 min,
11 7343-1524 = NISwi0 2b 16275 12100 4
13 (0549) 00020 2 CONT(M) 5 IIIG,U(M); No
flare or SID reported.
14 0245-0401 NO6HOS 2n 16279 12000 3
15 (OTS) 20000 2 No flare reported at time
of SID.
16 0759-0823 NO3E85 sb 16298 20100 3 I1Tg,U(DCM,M).
16 NO6E8O 2b 16298 22200 6 10 em flux = 220;No event
reported in dynamic spec~
trum,
18 NO9W63 In 16279 21100 4 IITD(M).
19 NLOW76 in 16279 21100 4 ILTb(M,DKM) . .
19 NO9W78 1b 16279 21100 4
NOSE38 sn 16298 20100 3
20 NOSE27 In 16298 21100 4 IN(M).
21 NOGEOS In 16298 11202 6 10 cm flux = 200;1TIg(M).
22 NO6EO3 In 16298 21000 3 Ilig,V(M).
25 NI5E56 In 16325, 11131 7 IV(DCM,M), Dur. 8 min;
TLIg(M).
30 0614-0701 N18W37 2b 16315 22120 7 1S,C(M) ;IZIN(M) «
Oct 1 0554-0622  s25W16 1b 16324 21100 4 IELD(M) 5 IN(DCM,M) «
1 0920-0950 © N16W51. 1b 16315 21100 4 IN in prog.
2 0935-1003 = -N13E24 sb 16337 20100 3 IN in prog.
2 1440-1600 $2925 In 16334 1131 7 IV(DCM), Dur. 6 min; IIIG I
(eM, . i
NI3ESS 2n 16336 12201 6 10 cm flux = 113; ITTg(M)
82344 In 16324 21101 5
NL1E27 In 16336 01202 5 TIIG(M).
N25E40 2n 16341 22100 5
N1GE4O 2n 16344 12100 4 IIIg(DCM,M) .
N25E39 1b 16341 21101 3 INC).
818076 sn 16346 00020 2 I, CONT(M).
NISEIO In 16344 21001 4 IS and IIIS in prog.
N18EOO sf 16344 00020 2 I, Cont(M).
00020 2 Z, CONT(M); ITIG(M,DKM);
No flare or SID reported. i
9 2007-2020 N13 W41 sn 16336 00020 2 Is,c(M). I
10 C1333) 00020 2 I,C(M); No flare or SID
reported.
10 (2217) 00020 2 Ic(M); IITb(M); No flare
or SID reported. |
11 1155-1226 NO9E62 sn 16363 00200 2 10 cm flux = 100; IZIN in i
prog.
12 1035-1136 © N28E29 sb 16357 10132 7 IV(DCM), Duration 5 min.; |
IIIG(M). i
13° (1100) 00022 4 CONT(M); No flare or SID |
reported.
1332-1422 N28E22 sb 16357 |
13 lst and \ 10120 4 1, CONT(M).
1352- 16H NL4Wa8 sn 16344
1958= S14W75 af 16343
13 ast \ 10120 4 IS, CONT(M).
2000"2016 N28E27 sb 16357
(Qossro3re NL6W48 1b 16344 21200 5 ITTg(M);10 cm flux = 119;
4 0143 $16W77 In? 16343 21200 5 Several different flares
(151-0231 N26E8B lf 16373 21000 3 during course of major SID
31



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES"

1975-1979 (continued)

TIME (UT) McMATH Ha FLARE COMP.
OF FLARE a PLAGE PROFILE FLARE

DATE oR EVENT tt POSITION IMP, NUMBER abcde INDEX REMARKST

1979

May 3 (0120-0153 N20W61 sn 15967 10133 8 IV(DCM) ; LLIG,V,U(M, DRM) «

0125-0230 N10WO3 2n 15974 12133 10

4 0237-0258 += NLIW10 sf 15974 00010 1 I1(M);No SID and no radio
freq. events reported.

17 (1049) 00010 1 IL(M);IIIg(DCM);No flare
reported.

Jun 3 1433-1521 N20E33 sb 16051 20202 6 GB,10cm flux = 632;IIIG,V,
UCDCM,M,DKM);A strong “ra~
dio” flare at all freqs.

4 0340-0510 N19E30 2b 16051 32200 7 10cm flux = 103;
TIIb(M,DKM) «

5 0455-0838 = NITEL4 2b 16051 22332 12 GB,10cm flux > 4000;11(TM) 5
IV(DCM,M);A great “radio”
flare.

0801-1023 N22W46 3b 16051 33110 8 II(M);Type II 1s common to

10 f and both flares, near maximum.

0855-1021 N24E69 en 16070 10110 3

13 0352-0423 -N22E68 In 16073 11010 3 TL).

17 C305) 00012 3 IL(M);11Ig,V(M); No flare
reported.

17 1604-1643 ‘NO6W30 sn 16078 00011 2 TI(M,DKM);I1Ig,V(M); Flare
association is doubtful.

18 0623-0634 S17W65 In 16065 2112 7 TL(M) 5 ITIG ,V(DCM,M) «

29 SL6W72 sn 16065 II(M); ILIG,V,U(M); Type

18 10112 5 II 4s common to both

1813-1820 SO6E74 sn 16088 flares.

22 ‘0446-0530 = N24W59 20 16073 12122 8 II(M) 318 ,C(M) 5 ILIG,U
(4,DKM) «

25 N15W90 1f 16086 2 6 IL(M) 5 IIT ,V(M) «

26 N12W62 sa 16102 20112 6 TI(M)

27 23290 sb 16112 00010 1 TI(M);111g(M); No SID or
single freq. events
reported.

Jul 4 0203-0320 NO7E44 2n 16122 12232 10 II(M,DKM) ; 1V(DCM,¥) 5
10 cm flux = 378.

4 = 1903-2110 NI1E36 1b 16122 11222 8 TL(M) 51 & CONT(M);

a 10 cm flux = 348.

5 (0137) 00030 3 IV(DCM,M);1S(M); No
flare or SID reported.

5 0650-0727 $29E11 In 16112 1012 4 II(M) ; ITIG,U(DCM,M) «

5 {244-2300 N15W33 an 16117 10021 4 TL(M)5 I1Tg,V(DCM,M) 5

2221-2236  S26E55 sb 16125 00021 3 IS,CONT(M) .

6 (E39) 00010 1 IL(M)5IIIG,V(M,DKM); No
flare or SID reported.

7 0440-0516 NL7W47 In 16117 11031 6 IL & IVC); TTIG(M,DKM) «

13° 0136-0230 = NI2E74 sf 2 00010 1 II(M); No plage at this

— location.
19 803833 eb 16148 10112 5 TQ); ITIG v(m).
827076 sf 16137
22 10113 6 IL(DCM,M) 5 18(M).
2331-2348 = N33W14 en 16156
23 (uany 292 NISW73 In 16161 01010 2 TL(DCM,M) ; 1Tg(M).
0215-0228 = N32W15 sb 16156 00010 1
23° 1645-1712 s05wo7 sn 16166 10110 3 TI(M);Also IV(DOM),
— Duration 5 min.

28 2355-0014 S22846 1b 16174 11110 4 TI(M) ; 111g ,V(DCM, 4) «

29 321-0416 = S14W42 An 16164 21132 9 IL & IV(M);T1Tg(M).

30 0220-0437 «= N23E14 20 16171 12031 7 IL & IV(M);ITIS(M,DKM) «

Aug 2 2105-2121 NISWS51 ab 16171 10010 2 II(M);ILIb(M); Also pos
sible IV(M), duration 4
min.; Flare association
doubtful.

2 2301-2332 $1263 sf 16192 00010 1 TI(M,DKM)  I1Tg,V(M)

7 NISE78 sn 16208 20120 5 IL(DCM,M) 318 ,C(DCM,M) «

13 826290 In 16224 01030 4 IL & IV(M)3 I1ig(M).

1B 826E90 In 16224 21321 9 GB, 10cm flux = 3700;IIIN,
CONT(M);Flare with strong
radio emission, especially
at MM and GM wavelengths.

14 1153-1203 $23E70 an 16224 10332 9 IV(DCM) ; ILIN, CONT(M) 5 IITg

See notes to Table 1 on page 20.

Ww

(4);6B,10cm flux - 7500;
Incomplete flare data.



APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)

TIME (UT) McMATH = Ha_FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE OR EVENT © POSITION IMP. NUMBER abcde INDEX REMARKS
1977 J
Apr 14 0650-0655 $2253 sf 14726 20120 5 CONT(M) 5 11Zg(DCM,M) -
16 (0711-0735 $2835 sf IN & CONT(DCM,M) ;
and 14726 10121 5 IITg(DCM,M)
0717-0827 S21E26 sn
May 21 (1332) 00030 3? IVU(M), Duration only 0.1
minutes; IIIg(M).
Jun 9 1233-1247 $27W16 en 14796 00021 3 CONT(DKM) ; L1G ,V(M, DKM)
25 425-1443 NISES7 in 14822 21000 3 IN(M)
26 T334-1405 S216 2n 14815 22100 5 No dyn. spectrum event
— reported,
26 © 1422-1545 s22wi8 In 14815 21100 4 IITg ,V(DCM,M,DKM)
26 1507-1530 © NLO E44 sn 14822 20000 2 No dyn. spectrum event
—— reported.
26 © 1546-1552 NISE44 sn 14822 20100 3 (DCM)
26 ©2049-2102 NISE43 sf 14822 10120 4 IS & CONT(M)
Aug 5 1858-1945 N27E48 In 14888 21100 4 No dyn. spectrum event
~— reported.
31 1004-1105 N26E80 2n 14930 12000 3 I1Ig(DCM,M)
Sep 3 (1457-1537 s32W43 sn 14924
and 00020 2 CONT(DKM) ; ITIG(M)
1515-1606 —_N26E37 sf 14930
5 2103-2124 =—-N23E08 sf 14930, 00020 2 IS & CONT(M)
9 T609-1625 NoBE3 sn 14943 20000 2 Radio Bursts only at CH
wavelengths.
18 0019-0140 —_-NO7W35 In 14943 11201 5 10 cm flux = 300;
IIIG(M)
25 N13E83 Ib 14963, 21100 4 TETb(DCM)
26 NL4E78 In 14963
and 21000 3 Fast drift bursts (DCM)
N24036 sn 14951.
29 NISE31 sn 14963 10121 5 IS & CONT(DCM,M);IIIG,
uC)
N13W32 sn 14963, 00020 2 CONT(M, DKM)
30000 3? A questionable SID of IMP
3; No flare or radio
events reported.
N32W33 sf 14967 00020 2 IN, C(DCM,M)
NOGEB1 sf 14979 20102 5 IITg(DCM,M)
NO6E82 sn 14979 20102 5 IITg(M)
NLOE6S sf 14979 0021 3 IN & CONT(DCH,M);III¢,
u(DcM,M)
7 1253-1430 NO3E58 sn 14979 00021 3 I & CONT(M,DKM) ; ITTb(DKM)
7 1752-1839 —_NO7ES6 sf 14979 00020 2 1C(M) ; LTIN(M, DKM)
8 1230-1402 NOBE44 In 14979 1121 6 CONT(DKM) ; ITTg(M)
lL Coo27y 00020 2 CONT(DKM);No flare or
radio bursts reported.
12 0020-0042 N1OEO1 sn 14979 00120 3 CONT( DKM) ; LLLG(DCM,M,DKM)
12 C0327) 00020 2 CONT(DKM);IS and IV in
Prog;No flare reported.
13 0033-0047 NOGWO9 sn 14979 00020 2 CONT(DKM)
14 0123-0158 —-NOGW26 sn 14979 10120 4 CONT( DKM)  1ZT(DKM)
15 (003) 00020 2 CONT(DKM);No flare or
radio bursts reported.
17 (0026) 00020 2 CONT(DKM);No flare or
radio bursts reported.
18 N19W45 sn 14979 00020 2 CONT(DKM)
19 S25E26 sf 14995 00020 2 IN,C(M)
19 2212-2310 —s26E16 en 14995 10021 4 IS, C(M) 3 ITTD(M)
21 2125-2255 = S28W14 sn 14995 00020 2 IIIS, C(M); ILIG,V(DCM,M).
23 (0345) 00021 3 Is & CoNT(M)
29 0820-0915 —_N20E90 sf 15017 00020 2 IN & CONT(M)
Nov 17 (1514) 00020 2 IN & CONT(M);
No flare reported.
ai 22023 sf 15031 00021 3 CONT(M) 5 LTIN(H)
Dec 1 © (2312) 00010 1 TL(DKM);No flare or
tadio bursts reported.
8 2248-2304 N23E68 af 15061 00010 1 TL(DKM);No radio bursts
reported.

23



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES", 1975-1979 (continued)

TIME (UT) McMATH Ho FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE OR EVENTtt POSITION IMP. NUMBER abcde INDEX REMARKS"
1979
Oct 30 1629-1733 N33E57 af 16399 00010 1 11H). .
Nov 1 0805-0842 NI3W72 1b 16386 11230 7 IV(DCH,M) ; IITG(DCM,¥) 5
~— 10cm flux = 110.

2 2126-2353 N20K01 en 16398 ooo11 2 TIM); 11g (M,DKM) .

4 S16E72 sf 16413 20134 10 II & Iv(M);11Tg(M).

4 N25W67 sn 16389 10010 2 II(M).

4 SISW13 sb 16401 10112 5 IL(M)5 IIIG ,V ,U(M,DKM) «

5 S14E48 2b 16413 12114 9 II(M) 3 L1G ,V(M,DKM) .

5 SL4E44 1b 16413 21213 9 GB,10 cm flux = 617;

IL(M) ; LILg,V(M,DKM) .
6 NISELL In? 16406 21233 uy IL & IV(M);10cm flux = 170
S14E39 In 16413 21130 7
N34E90 In 16419a)
6 11200 4 GB,10cm flux = 600;1I1G(M)
0850-0914 — N18W57 ib 16398

6 TAR6-1524 —S14E39 sb 16413 10233 9 10cm flux = 268;I1(M);1V
(Dew) ; L1G, v(DCM, Mw).

8 0116-0152 -NSIE71 1b 16419b 21233, u 10cm flux = 342;1T & IV
(4); [LLG ,V(M,DKM) «

8 0826-1136 = S14E14 2b 16413 22232 rey IV(DCM);10cm flux = 320.

8 TIT6-1139 —S14E08 1b 16413 21133 10 TX(DCM,M) 5 IV(DCM) ; TITg
(DCH,M).

9 0304-0322 S15B02 In 16413 21334 1B GB, 10cm flux = 15125 1I(M,
DKM);1V(M);ILIG,V(M); A
great “radio flare” at all
wavelengths.

9 0601-0627, s15W03 In 16413 11213 8 10cm flux = 288;11(M);
ILIg,V(M,DKM) .

9 2125-2154 N22W29 sb 16406 00110 2 IL(M) 5 111g, V(M,DKM) .

10 0633 SL6WLS 2b 16413 22324 13 GB,10cm flux =1848;11(M);
IS,DC,CONT(M);A great "ra-
dio flare” at all wave-
lengths.

12 S15E03 In 16418 21213 9 10cm flux = 2425 11(M)5

81728 so 16413 20213 8 ILIG,V(M,DKM) «

12 N12E24 2b 16421 12210 6 10cm flux = 10731I(M,DKM) ;
ILIG(M,DRM) .

14 2023-2110 N33W15 1b 16419a 11230 7 10cm flux = 107;1V(DCM).

15 2021-2140 —N1OWI5S 2b 16421 12210 6 10cm flux = 167;11(M);
I1Ig,V(M).

15 2115-2446 N29W38 2b 164198 12231 9 GB,10cm flux = 920311
(M,DKM) 5 IV (4) ; LIIG(M) «

16 0220-0244 N18WOS sf 16425 00010 1 II(M) 3 ITIG(M,DKM) «

17 Ti45-1230 = NL4Wi7 sb 16425 10112 5 IL(M)3IIIG,U(M).

21 0720-0725 © s38w58 on 16433 00110 2 TI(M) 5 ITIS(M) .

Dec 4 11806-1822 S16W18 on 16458 10010 2 T1(M) 5 111g(M) .
1814-1826  $26E49 sb 16476 10110 3

10 2317-2344 «= s18w85 In 16480 01010 2 TI(M) ; ELIG,V(M,DKM) .

11 TIS0-1240 = N26B41 In 16507 01030 4 Iv(DCM).

(1335) 00130 4 IV(DCM,M, DRM); ITTG(M,DKM)
No flare or SID reported.

13 1353-1402 S17W31 sb 16492 20213 8 10cm flux = 1193TI(DCM,M).

14 (1259-1320 $1333 sn 16495 10130 5 IV(DCM) ; ILIG(DCM,M) «

T310-1331 —N19W42 1b 16490 11130 6

15 2139-2150 S28W90 en 16493 00010 1 IL(M); 111g ,V(DCM,M,DKM) .

16 (02m) 00010 1 ‘TI(M); IITg(M,DKM) ;No flare
or SID reported.

18 1902-2042 NIOW38 1b 16514 11210 5 10cm flux = 106;11(M);
ILIG(M,DKM).

19 2156-2316 S15E36 2b 16529 22233 12 GB,10cm flux = 970;11(M,
DEM); IV(DCM,M,DKM) ; 1IIG,
V(DCM,M,DKM) «

20 0543-0800 —-S18E33 wb 16529 21213 9 10cm flux = 200; 11(DCH,M) 5
Also IV(DCM);Duration 4,5
min.; IIIG(DCM,M,DKM) «

23 0215-0233 2043, sf 16525 00010 1 IL(M) ; IITg,V(DCM,M,DKM)

25 0655-0800 s14w43, 2b 16529 22232 u 10cm flux = 200311(M);1V
(DOM) s LITg ,V(M) «

25° 4(2330) | 00010 1 T1(M); No flare or SID re-

(2405) ported.
26 ©0048-0212 $1204 1b 16539 11010 3 II(M,DKM) ; ITTg(M)
29 S15E23 sf 16548 10210 4 10cm flux = 170;
$13E73 In 16558 11210 5] TI(DCM,M)
29 s16W90 In 16529 21112 7 TI(DCM,M) 5; IIIg ,U(DCH,M) .
30 (0314) 00010 a IL(M); No flare or SID

reported.

See notes to Table 1 on page 20.

19



APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)

TIME (UT) McMATH = Ha FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE OR EVENT © POSITION IMP. NUMBER abede INDEX REMARKS
1979
Oct 17 0038-0128 —_-N26E43 In? 16373 21000 3 IIIb(M); Flare importance
is questionable.
17 0648-0754 — N26E42 2n 16373 22130 8 Iv(DCM), Duration 7 min.;
~~ IITg, VQ).
19 0018-0122 N2BE19 2n 16373 12200 5 10 cm flux = 1133 ITIb(M);
~ ILIG(M,DKM) «
0256-0310 —N33W35 An? 16366 10cm flux = 1275 1ITb(M,
20 and 11200 4 DEM).
0305-0315 N28E08 An? 16373
20 ©0552-0634 N27 E04 2n 16373 22200 6 10 cm flux = 394; No event
in dynamic spectrum.
20 N26E01 1b 16373 21100 4 TIIg().
20 N26WO2 2b 16373 12100 4 IITg(M,DKM) .
20 N19E52 an 16381 12100 4 IIIg(M,DKM) «
21 N26W15 1b 16373 11200 4 10cm flux = 104; 1IIb(M).
22 0630-0649 N26W16 sn 16373 00120 3 IN, CONT(M).
23 0558-0610 = N27134. sn 16373 00020 2 IS,DC,CONT(M) «
25 ‘0028-0111 $2028 2n 16384 02000 2 No SID or radio events re~
ported.
25 0118-0214 — S28W47 2£ 16374 02000 2
29 (0649) 00020 2 IN, CONT(M);1ITg(M); No
prior flare or SID re~
ported.
29° 1125 N14E58 2n 16374 02100 3 IIIg(DCM,M);Flare data
. incomplete.
29 © 2017-2111 S30W40 1£? 16385 01020 3 I8,C(M) ;IITg,V UCM.
Nov 2 (1449) 00030 3 Iv(DCM), Duration 5 min.;
IIIG(DCM,M): No flare or
SID reported.
3 (0221) 20000 2 I1Tg,V(M,DKM); No flare
reported.
5 0200-0234 —-N18E29 en 16406 20100 3 ITTg(DKM) ; INCM) .
5 D2a7-0442 SL 2ES4 2n 16413 12100 4 ITIG(M).
5 D507-0716 = s12H52 2n? 16413 12104 8 IIT g(M,DKM) «
5 TOI0-1053 S14ES7 287 16413 02003 5 IITG(DCM,M) .
6 0232-0235 S13B45 ln 16413 21124 10 CONT(M), Duration 5 min.;
IITg,V(M,DKM) «
6 0306-0346 S15E47 2b 16413 22100 5 1s(M).
001-2029 ©. S14E39 n 16413 11020 4
6 ‘and 18, C(M) ; ITIG(M,DKM)
2007-2028 S16E78 Bb 16418 10020 3
7 0255-0337 $148.25 26? 16413 12000 3 No radio events reported.
7 0331-0340 N21E53 sf 16414 00020 2 CONT(M), Duration 6 min.;
ILIG(M,DKM) «
0347-0419 — SI1SE35 2b 16413 12000 3 No radio events reported.
7 O512-0540 = S15832 2n? 16413 12000 3 IL 1g(DKM) 5 TTINCM) «
7 0641-0658 © S14E30 In 16413 11122 7 CONT(M), Duration 7 min.;
TIIG(M,DRM) -
8 0805-0817 S1SEL1 sb 16413 10203 6 10cm flux = 187; ITIG(DCM,
~ ¥M); Also Iv(DCM) but only
2.5 min. duration.
8 2156-2253 N2BE26 en 16414 00200 2 10cm flux = 211; IITg,U
(4, DRM).
2331-2359 SISE47 sb 16418
8 { and | 20200 4 10cm flux = 268
2332-2358 $15B00 sf 16413
9 SI7E4L sn 16418 20000 2 No radio events reported.
S16E25 sb 16418 10cm flux = 119;11Lg(DCH);
10 f \ 10200 3 Also IV(DCM), duration 1.5
1217-1237 S1SW17 sb 16413 minutes.
soa EUIT) 00200 2 10cm flux = 120; No flare
or SID reported.
13 1518-1541 N19W90 1b 16406 11130 6? Iv(DCM), Duration 2 min.
14 1520-1540 N17 W90 sn 16406 20000 2 No event reported in
dynamic spectrum.
15 (1007) 00200 2 10cm flux = 140;I1Tg(M);
No flare or SID reported.
16 (0830) 00200 2 10cm flux = 130; No flare,
SID, or Dyn.Sp. events re~
ported.
16 0935-1045 NL8WOS 2n 16425, 02122 7 CONT(M), Duration 8 min.;
ILIG(M); IN(M) «
18 1055-1120 $2729 1b 16433 11200 4 10cm flux = 267; ILIG(M);
IN(M).
21 (1101) 00200 2 10cm flux = 370; No flare
or SID reported.
27 0647-0804 —-NIGEOS. ln 16448 01020 3 CONT(M) 5 £8(DCM) «

32



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES", 1975-1979 (continued)
TIME (UT) McMATH Ha FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
pare on evenr*t posrrroN © IMP. _NUMBER abede INDEX REMARKS”
1978
Oct 9 1951-2137 S14W61 1b 15570 11223 9 10 CM Flux = 140311(M, .
— DKM);1S & CONT(M);IIIG,
v(DCM, 4) «
10 (0033-0040 $1774 sf 15591 IL(M);Fast drift (DCM);
and 10010 2 Simultaneous flares in
0035-0100 -$24w23 sf 15582 widely separated regions,
but Culgoora rad. places
“Source at SE limb (15591)
11 0835-0947 $1932 2n 15587 02110 4 II(M).
12 DI2T-0232 ~—M11N90 In 15569 21031 7 IVM(M) ; IL1g(M) 5 IIIS and
Culgoora radioheliograph indicates Type IV, NW limb, moving IS,¢,DC(M).
from 1.2 to 2.0 RO.
13 1233-1350 S18WO1 2b 15587 12234 2 10 CM Flux = 220311 and
IV(DCM,M) ; LL g(DCM,TM) 5
Strong radio bursts at
all frequencies, es~
pecially at M wavelengths
15 (0007) 00010 1 II(M);1S,DC(M) ;No flare
Culgoora radioheliograph places source at 1.2 RO, P.A. 90° or radio bursts reported.
(Bast Limb)
16 (1314-1429 S15W56 sn 15587 II(M);No SID or radio
ai 00010 1 bursts reported.
1338-1421 S07 W62 sf 15587
16 2142: N32B47 1b 15598 11200 4 GB, 10 CM Flux = 586;
Fast drift (DCM).
18 S19W55 sb 15587 00010 1 IL(DCM,M) ; IT g(DCM,M) 5
Is ,DC(M).
18 (2141-2235 $29830 sb 15604 II(M);Also possible IV(M)
and 10010 2 4 min, duration; Simul-
2141-2349 N32H22 sn 15598 taneous flares.
19 0104-0130 $2132 sn 15591 00010 1 TI(M) 5; IL1g(DCM,M,DKM) «
21 557-1712 n30W12 In 15598 11122 7 IL(M)  IIIG ,V(DCM,M,DKM)
Ic(M).
25 (0442) 00010 1 IL(DCM,M);No suitable
Culgoora radioheliograph places source at 1.1 RO, P.A. 120° prior flare.
(Possibly region 15620, or 15628, at SE limb)
Nov 8 1751-1807 NIBEL2 1b 15643 MIL 5 TI(M); ILLG ,V(DCM,M,DKM) .
10 0048-0232 NI7EOI 2n 15643 22130 8 TI(M)5 1V(M,DKM) 5 I8(DCM) ..
28 0511-0646 NI4EA7 2n 15682 12132 9 ICM) ; 1V(DCM, M)  1S(DCM) ; q
— TIIs(M). |
29 0505-0613 NISE38 2n 15682 12130 7 IL and IV(M);IIIS & IS(M) |
29 820876 sn 15687 00010 1 II(M)5 III, VM).
29 S18E58 sb 15687 00012 3 IE(M) 5 ILIG ,V(DCM,M,DKM) « [
30 0145-0254 —- NI4E26 In 15682 11131 7 TE(M); LV(DCM,M) ; ILIb(M) .
Dec 3 2032-2044 $2365 sb 15694 10113 6 IE(M) 5 ILIG ,V(DCM,M,DKM) . q
4 Q545-0600 © S23E62 In 15694 11010 3 TI(M);1V(DoM), 6 minutes }
duration; ITIG(DCM,M).
4 (1144) 00030 3 IV(DCM,M) ; TTTg(M) ;No
flare or SID reported.
4 = 1844-1857 S24E51 sb 15694 10112 5 II(DCM,M) ; ITTg ,V(DCH,M,
DKM) «
7 0956-1023 sLew47 1b 15687 21113 8 TQ 5 L1Tg(M) «
7 1950-2055 SLAE74 In 15697 11222 8 10 CM Flux = 104;
TI(M,DKM) ;18,C(M).
7 2341-2435 $15W57 2b 15687 12010 4 IL(DCM,M) ; I1Ig ,U(DCM,M) .
10 2332-0119 = $13E29 2n 15697 22130 8 ‘II(M, DKM) ; IV(DCM,M) ;
Fast drift (DCM).
11 (1911-2157 $16W50 2b 15694 12433 13 GB,10 CM Flux = 8320 (333 i
f and | with second flare);IV(DCM a
1923-2014 S1SE14 lb 15697 11232 9 M,DKM) ; LITS(M,DKM) ; Simul
taneous flares; A great
“radio event” with great
bursts at all wavelengths
1B s22w2t In 15696 21110 5 TL(M) 5 LTIG(M,DKM) .
1B SISEOL 2b 15697* 22130 8 ILC); IV (DOM, M) 5 ILIB(M,
{ and | DKM); *Simultaneous
0349-0453 S17W69 Ib 15694 21130 7 flares but Culgoora ra~
dioheliograph places
source of II and IV at
0.3 RO, P.A. 155° (SE
disk, region 15697).
See notes to Table 1 on page 20.
14



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES"

1975-1979 (continued)

TIME (UT) McMATH = Ha. FLARE comp.
OF FLARE. Ha PLAGE PROFILE FLARE
DATE or _Evenr tt posrrron IMP. NUMBER abede INDEX REMARKST
1976
Jan 17 2142-2149 S15E02 sf 14029 0110 2 II(DCM,M,DKM) ; II1g,U,V
(M,DKM) «

19 (1414) 00010 1 LI(DKM);No flare reported
(No Patrol 1434-1743 UT).

19 (1850)* 00012 3 LI(DKM) ; ITIG,V,U(M,DKM)
No flare patrol 1836-2044

Mar 20 (0205) 00110 2 II(M,DKM) ; ITIg ,V(DCM,é)
No flare reported. Cug-
(Perhaps active region 14143 goora radio heliograph
on invisible hemisphere) places source E. Limb
(1,3 RO,P.A. 80°).

20 (2257) 10020 3 IL(M,DKM) ; CONT(M, DKM) ;
ILIG(M,DKM);No flare re~
ported; Culgoora places
source at E. Limb.

21 0750-0835 NO4W29 1b 14127 31102 7 ITIG(DCM,M,DKM)

23 (0837-0841 —S0SE90 sb GB,10cm,FLUX = 650;

‘and } 14143 30234 12 Iv(DCM,M) ,CONT(DKM) ; ILIG
0907-0945 S07E90 sn (DCM,M); A strong “radio”
flare at all frequencies.

25 806875 en 14143 10232 8 IV(DCM,M) ; LITb(M) .

25 S05E69 in 14143 11232 9 IV(M, DRM) ; 1 Tg()

26 00030 3 IV(M, DKM) ; IIT ,V(M, DRM) ;
No flare reported.

28 ©0546-0613 S07E37 eb 14143 10113 6 II(M) 111g ,U(M,DKM)

28 0922-1002 SOBE31 sn 14143 00032 5 IV(DCM,M) ,CONT(DKM) ;
IITg(DCM,M)

28 1342-1353 S07E37 sf 14143 00030 3 IV(M, DKM) ; ITIG(M, DKM)

28 1905-2021 $0728 1b 14143 11332 10 GB,10 cm, Flux = 1965;
T1(M,DKM) ; LV(DCM,M,DKM)
TIIG(M,DKM); A great
“radio” flare at all freq

31 1140-1350 S07W09 In 14143 11132 8 IV(DCM,M,DKM) ; [ITg(DCM,)

apr 5 (2150)* 0-031 24 IL(M, DRM) ; 1V(DCM,M,DKM)
(Perhaps region 14161 on No flare patrol 2045-2515
invisible hemisphere - Culgoora tadio heliograph
Return of active region 14127) places source at NE Limb
(1.2 RO, R.A. 45°).

20 1740-1846 NO3W77 sf 14161 00231 6 TI(M,DKM) ; IV(M,DKM)
ILIg,V(M,DKM)

29 1904-1940 SO8W31 en 14179 10131 6 vc)

30 1243-1306 = so6w41 sn 14179 10132 7 Iv(DCM,M) ; ITIG(M)

30 2048-2218 sosw4s 1b 14179 21332 iL GB,10 cm, Flux = 1670;
I1L(M,DKM) ; 1V(DCM,M,DKM)
ILIG,V,U(M,DKM); A great
“radio” flare at all freq

May 1 2140-2238 — so8w60 sf 14179 10132 7 TIM); IV(DCM,M) , ITIG
(DCM,M) «
16 0602-0614 —_S03w62 sn 14203 10110 3 TEM); LLIG ,V(DCM,M, DKM)
Aug 6  (< 2038) 00010 1 TIN(DCM,DKM);No flare re-
ported.

7 0155-0209 —_N12E08 sn 14352 10212 6 10cm Flux = 105; II(M)5
‘ILIg(DCM,M) «

18 1844-1857 S12E81 sb 14375 20113 7 IL(DCM,M,DKM) ; IITg,

—— v(DeM, 4, DKM)
22 1217-1222 so2w90 en 14366 20231 8 10cm Flux = 1523 1V(DKM)
Sep 1 0650-0735 — NIL9W57 sn 14403 00132 6 IV(DCM,M) ; CONT(M) ; ITTG(M)
0131-0210 © N19W28 sn 14395 10131 6 ICM) IV(M) 3 ILIG(DCM,M,
DKM).
Dec 9 0201-0217 —_NO3E33 en 14553 00012 3 IL(DCM,)
18 (2152) 00030 3 II(M);1V(M);No flare re~

See notes to Table 1 on page 20.

ported. Culgoora radio
heliograph places source
at SW Limb (1.1R@;P.A.
300°)



APPENDIX OF 3" FOR 1975-1979 (continued)
TIME (UT) McMATH Hig FLARE come.
OF FLARE, Ha PLAGE PROFILE FLARE
DATE OR _EVENT POSITION IMP. NUMBER abede INDEX REMARKS
979 —
Feb 18 1707-1750 NI8W17 In 15823 01200 3 10 cm flux = 185; ILIG,V
(DCM, M,DKM) .
18 (2156-2243 NITELL sb 15830 10122 6}
{ ai ‘ CONT( DCM) ; LELG(M, DKM) «
2203-2246 —N18W20 An 15823 11122 7
18 (2330-2412 NIB W19. sn 15823)
| and 20020 4 IS, CONT(M); IIIG (M,DKM)
2342-2436 NIBE12 sn 15830]
19 "T520-1649 = N19W27 1b 15823 11122 7 CONT(M); LLIG(DCM,M,DKM) «
19 1758-1906 —-NL6EO2 2b 15830 22200 6 10 cm flux = 130;1N(M);
— ILIN(DCM,M) «
20 1324 sf 15823 20000 2)
| { TITg(M,DKM) «
N18WO6 lf 15830 21000 3 |
20 NI7W17 sn 15830 10202 5 10 cm flux = 129;11IG,V
(Cea).
20 2020 In 15830 01124 8 IS,DC CONT(M); IIIG,V(DCM, |
M,DKM) « 4
21 N1ew22 sf 15830 00020 2 CONT(M) ; IS ,DC(DCM, 4)
21 N16W30 sn 15830 10202 5 10 cm flux = 226; Type IV
also reported, duration 1
min. (DCM).
21 1555~1607  NI6W34 sn 15830 10203 6 10 cm flux = 178; IIIg,V
(Dem, M) «
22 1119-1257 N2SW4B 2n 15823 12121 7 CONT(M) ; LIT g(DCM) .
24 2315-2508 — N2066 lf 15830 01021 4 IS, DC, CONT(M) ; ITTg(DCM,M,
12348-2408 $2707 sf 15838 00021 3
Mar 5 1405-1558 —_N13E38 1b 15863 21100 4 Simultaneous flaring in
TAO8-1513 —N21E44 sb 15863 20100 3 different parts of plage,
and and at time of start of
1409-1454 — N12E25 wb 15863 21100 4 major SID. j
5 TSI7-1609 1952 2b 15849 12000 3
6 1423-1506 — s21W10 In 15856 01021 4 CONT(M) ; LIIG(M) «
16 (1433-1446 —-N18WO9 sb 15877 20100 3 I
and TEIb(M)51,DC(M)«
1411-1504 —-N19E26 1b 15877 21100 4 F
18 (T355-1405 — N4owls sn 15880 20100 3 No Dyn.Sp. events. Flares I
t and have common max. at 1425 i
1418-1425 NOGE32 1b 15887 21100 4 UT, with SID. if
19 1654-1745 NOTES 1b 15887 21201 6 10 cm flux = 220; IIIg q
— (DCM). ;
21 1258-1339 NO7WO9 1b 15887 21100 4 No Dyn.Sp. events re~
ported.
22 1338-1545 NO7W26 Wb 15887 21200 5 10 cm flux = 120; No Dyn.
Sp. events reported. 4
23° 1904-2015 NOBH43 1b 15887 21000 3 No Dyn.Sp. events re~ 4
ported. i
24 0718-0755 NO7E49 sb 15904 10202 5 10 cm flux = 119; IIg
(DCM,M) «
25 0030-0123 NO7W64 sn 15887 20100 3 TITg(M).
25 0650-0731 —No9w64 sf 15887 20100 3 No Dyn.Sp. events re~
ported.
25 1802-1829 NOBW71 1b 15887 21202 7 10 cm flux = 325; IIIg
(DCM,M) «
26 0309-0325 No9w80 sn 15887 20000 2 TITb(M,DKM)
26 S30W12 sn 15899 20002 4 IN(M). a
29 29852 1b 15918 21100 4 IN(M). [
31 S24E19 2b 15918 22200 6 10 cm flux = 240;18(DCM). i
Apr 3 $23W0S 1b 15918 11200 4 10 cm flux = 368; IIIg i
(4,DKM) «
3 s2iwit In 15918 11203 7 10 cm flux = 175; ILIS(M)
5 N20E88 sb 15933 20000 2 TIIg(DCM,M).
5 1823-1846 N20E89 sn 15933 00201 3 10cm flux = 160; ITIG(DCM)
10 0458-0530 N1OE90 1b 15948 21000 3 IIIG ,U(DCM,M).
lL 083% N1OE70 in 15948 21002 5 No Dyn.Sp. event reported
lL 132: 826042 sn 15940 20222 8 10 cm flux = 234; IIIg,V,
U(DCM,M,DKM);I ,DC,CONT(M)
16 (0510-0521 —_NO3W09 1b 15937 21100 4 IlIg(M); Different flares
053. NI8EIS 1f 15952 21000 3) overlap with major SID.
25 213 $27853 2n 15968 12103 7 ILIG,V(DCM,M).
27 (0529-0555 NIGELS sn 15967 10203 6 10 cm flux = 137; III¢,V
and (4). These flares precede
0537-0637 N12E80 In 15974 11200 4 the major flare event
following, at 0633 UT.
27 1628-1725 NI9EIO sb 15967 11000 2 10 cm flux = 173; I1Ig
(DCM,M)
29 © 1605-1627 NIGE44 sb 15974 20100 3 IITg,¥(DCM,M,DKM).
29



APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)

TIME (UT) McMATH Ha FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE OR EVENT —_ POSITTON IMP, NUMBER abede INDEX REMARKS
1978
May 5 1028-1032 N28W54 1b 15266 11203 7 10 CM FLUX = 430;ITIG,V
(DeM,M);A strong radio .
flare at all wavelengths,
especially metric.
5 (2038) 10020 3 IS ,C,DC(M);IIIg,V(M);
No flare reported.

9 (0356) 20000 2 ILTg(M) 5 LEIN(DCM,M) 5
Culgoora radioheliograph places source at 1.1 RO, PeA. 270° No flare reported.
(Probably active region 15266 at W limb)

9 (0708) 20000 2 ILTg(DKM);No flare re-

ported.

18 (0730) 00020 2 CONT and IN(M);No flare

reported.

18 1024-1046 S18W48. sf 15296 00020 2 CONT(M);No SID or radio

bursts reported.

19 2343-2355 S21W76 2n 15296 12000 3 A flare of IMP. 2, with

little effect.

20. (2048) 00021 3 IS ,C(DCM) ; LEINCM) 5

No flare reported.

26 0551-0714 —NL6E2I af 15314 20000 2 IS and ILIN(M)

26 1732-1813 N20E61 1b 15319 21102 6 TIIG(M,DKM)

29° 1720-1848 N27 23 1b 15314 11200 4 10 CM FLUX = 205;No DYN.

SP. events reported.
30 0630-0827 NI6W30 2b 15314 22101 6 IITg(DCM,M)
(Accompanied by a simultaneous flare of IMP. 1b at
N21E15, in region 15319)

30 1927-2027 N18W36 qb 15314 21100 4 No DYN. SP. events re-
ported.
June 5 0729-0812 N23W65 1b 15319 21000 3 I1Ig(M)
6 (0355) 00020 2 IS,C(M);I1Ib(M);No flare,
SID or radio bursts re~
ported.
19 0354-0418 — N18WOS sn 15360 00020 2 CONT(M) ; L11g(DCM) ;Poor

flare association;No SID
or radio bursts reported.

20 (0540) 00020 2 CONT(M);No prior flare,
SID or radio bursts re~
ported.

22 0235-0301 S20B66 dn 15375 21000 3 No DYN. SP. or radio
events reported.

25 © (0114) 00020 2 18,C,DC(M);No prior flare
or SID or radio bursts
reported.

26 © (2117) 0-020 22 IS,C(M);IIIb(M);No flare
patrol 2040-2130 UT.

29 0501-0512 NL6WI4 sf 15376 10204 7 10 CM Flux = 180;
ILIG,V(DCM,M,DKM)

July 1 (1341) 20100 3 No DYN. SP. event and no
flare reported.

7 {1205-1230 $26W57 sf 15389 20101 4 No DYN. SP. event. Simul-

T211-1227 $1 9865 sb 15397 taneous flares at time of
sID.

7 $16W52 en 15384 10020 3 CONT(M)

8 S15W66 sn 15384 20222 8 10 CM FLUX = 420;CONT(M);
TLIG(M,DKM)

9 $21W02 sn 15400 10202 5 10 CM FLUX = 118;IIIg,

NISE71 1b 15403 11202 6 V(M); Simultaneous flares.

9 T637-1710 —N17E69 sn 15403 10202 5 10 CM FLUX = 121;IIIG,V
(cM, M, DKM)

10 1241-1415 NISES7 lb 15403 21000 3 VQ) 5 LEIN(M, DKM)

10 TS46“T615 —NL6ES6 sn 15403 10120 4 CONT(M) ; ILIN(M,DKM)

10 NI7ES4 1b 15403 11123 8 IS, C(M) 5 I1Tg ,V(DCM,M,DKM)

MW NI7E49 sn 15403 20000 2 IITg,V(M, DRM)

11 0540-0620 N16E48. 2b 15403 22202 8 10 CM FLUX = 472;IIIb,
V(M);Strong radio bursts
at all wavelengths.

11 0933-1000 —-NIBE45. en 15403 20000 2 No DYN. SP. event.

u NI7E41 1b 15403 11020 4 IS,C(M) ,ITIG(DCM,M,DKM)
MW NI8E38 2b 15403 22100 5 ILIN() ; I1Tg ,V(DCM,M,DKM)
2219-2237 2060 sf 15409 20100 3 Either flare could be

— associated with the SID.

12 0236-0340 =. NI8E35 1b 15403 21000 3 ILIG(M,DKM); IS and
ILIs(M)

12 (0517-0545 N21W65 sn 15409 I8,C,DC(M) ; LL Tg(DKM) ;

521-0544 N17 E33 sn 15403 10021 4 No radio bursts reported;
0556-0559 —-NI2E61 sn 15410 Flare-ambiguous.

26



TABLE 3, NUMBER OF "MAJOR" FLARES DISTRIBUTED BY VALUE OF COMPREHENSIVE FLARE INDEX, 1975-1979

Comprehensive Flare Index
YEAR 1 2 3 4 5 6 7 8 9 IO 4 122 13° 14 15 16 17 18 | TOTAL
1975 6 2 7 4 4 6 4 3 2 1 2 40
1976 2 3 7 1 2 6 4 3 2 1 1 1 31
1977 16 6 5 3 5 1 4 2 1 1 4 2 2 52
1978 37. 16 #415 17 27 22 47 17 14 il 9 9 6 4 1 221
1979 23°15 21 23 18 20 14 21 15 13 5 5 3 1 197
TOTAL 84 42 55 48 55 S54 43 46 32 27 21 7 il 5 i 541

Similar data from Reports UAG-14 and 52 for reasonably comparable years at the start of cycles 19 and 20 are
given in Table 4 and provide a possible basis of comparison for the beginning years of the three cycles. Informa~
tion for the year of minimum and for a fourth year in cycles 19 and 20 is also included to broaden the basis of
comparison.

TABLE 4. NUMBER OF "MAJOR" FLARES

Total With CFI > 10
(Year of Minimum) (1954) (Data not available)
Cycle 19 1955 21 1
1956 71 6
1957 162 29
1958 115 28
(Year of Minimum) (1964) 3) i)
Cycle 20 1965 6 0
1966 68 16
1967 102 8
1968 119 13
(Year of Minimum) (1976) (31) (3)
Cycle 21 1977 51 9
1978 221 40
1979 197 27
1980 (Data not available)

It is difficult to know how to make valid comparisons for the successive cycles. The increased availability
of radio frequency data in later years has tended to increase the number of flare events that qualified as “major”
on the basis of Type II bursts. The time of minimum within the year of minimum also has varied in successive
cycles making detailed comparisons difficult. In spite of these situations it can be said that the rise to maxi-
mum in cycle 21 was especially flare-rich with more events qualifying as "major" flares in 1978 and 1979 than in
any year since 1955 when these studies began. The numbers of flares with CFI > 10 in 1978 and 1979 were also
exceedingly high.

4. COMMENTS ON APPENDIX TO TABLE 1 WITH COMPREHENSIVE INDICES FOR “LESSER” FLARES

In order to provide values of the Comprehensive Index for flares of potential interest but not included in the
list of “major” flares, an Appendix to Table 1 has been prepared. The Appendix follows the format and/conventions
of Table 1 and gives profiles and comprehensive indices for the following categories of flares:

a. All flares of Ha importance 2 not contained in the list of “major” flares.

b. All ionospheric disturbances of importance 2 not contained in the list of “major” flares.

ce. All 10 cm events with an index of 2 not contained in the list of major flares (i.e., bursts with flux
< 500 but > 100 flux units).

de an flares for which Type IV emission was reported but for which the duration was less than 10
minutes.



distinction has been made between “no flare or subflare reported” and “Ha observations not in progress". An
asterisk in the Time colum of Table 1 identifies the latter situation. Underlined times indicate best estimates
of starting and ending times of the Ha flare. ‘The remarks column gives additional information about the flare
event, especially the radio frequency emission. This column indicates the occurrence of a Type II burst when this
fact is masked in the fourth entry in the profile by the occurrence of additional continuum or Type IV emission. _

The primary source of flare data used in Table 1 is the Quarterly Bulletin on Solar Activity supplemented by
reports from individual observatories given in Solar-Geophysical Data bulletins. The latter publication is also
the source for the ionospheric and radio frequency data. For conventions of abbreviations, see "Solar-Geophysical
Data (SGD)" especially SGD 366 (Supplement) Explanation of Data Reports, February 1975, U. S. Department of
Commerce (Boulder, Colorado 80302), USA). See also the notes at the end of Table 1 of this report.

3. COMMENTS ON THE DATA INCLUDED IN THE LIST OF "MAJOR" FLARES

Table 2 of this report provides a comparison of the Ha importance of the flares in the list of “major”
flares, 1975-1979, with the Comprehensive Flare Indices for the same events. In these years, as in earlier
studies, flares that were markedly above average in at least one aspect of the electromagnetic spectrum included a
high proportion of events (56%) that were reported only as Ha subflares, or were not detected and not reported at

all in Ha . These results continue to support the worldwide effort to compile data on Ha subflares as well as for
the more important optical events.

TABLE 2. Ho IMPORTANCE OF FLARES IN LIST OF "MAJOR" FLARES, 1975-1979

Hor Value of Comprehensive Index
Importance 1-3 4-6 7-9 10-12 13-15 >is Total
Number of Flares
3 0 0 3 2 5 1 i
2 O 10 24 25 8 0 67
1 15 54 58 30 3 0 160
s 89 67 30 3 0 0 189
z 77 25 7 5 0 0 114
‘TOTAL 181 156 122 65 16 1 541
Percent of Flares
3 i} oO 2 3 31 100 2
2 oO 6 20 38 50 i) 12
1 8 35 47 46 19 ° 30
s 49 43 25 5 0 oO 35
2 43 16 6 8 0 0 21
TOTAL 100 100 100 100 100 100 100

The “major” flares distributed by year and by value of the comprehensive flare index are enumerated in Table
3. It can be seen that even in 1976, the year of /sunspot minimum between cycles 20 and 21, there were 31 events
that met our criteria for “major” flares. For 3 of these flares, the CFI's were > 10 and constituted significant
solar events. In addition, Table 3 shows the level of flare activity in the first three years of cycle 21.



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES", 1975-1979 (continued)

TIME (UT) McMATH Hq FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE or Eventtt posrtron IMP, NUMBER abede INDEX REMARKSTM
1978
Dec 13 (2319-2425 S15W80 In 15694 31100 5 No DYN. SP. event re-
and ported;Several “simul~
2323-2414 — S14W10 sn 15697 30100 4 taneous flares” (widely
‘and separated on disk) with
N20W17 sn 15700 30000 3 onset of major SWF.

4 S14Wl8 1b 15697 11110 4 II(M).

17 0729-0805 S15 W51 2n 15697 32201 8 10 CM Flux = 243; No
DYN. SP. event reported.

18 2346-2404 $1290 lb 15697 11110 4 IL(DCM,M,DKM) ; ITIG,V,U
(DCM,¥,DKM) «

20 (0645) 10010 2 TL(DCM,M) ; LLIG(DCM,M) 5
No flare or radio bursts
reported.

24 (2036) 0010 1 IL(DCM);No flare, SID or
radio bursts reported.

27 1626-1804 — S13E43 2b 15733 22232 i 10 cm Flux = 380; II and
IV(M) 5 LLIG(DCM) .

29 0612-0635 S35E44 en 15739 00010 1 XIN and ILIS(M); No SID
or radio bursts reported.

30 0541-0652 $20E66 2b 15746 12110 5 II(M,DKM) ;IV(DCM), 4 min
duration; IIIb(DCM).

30 0735-0815 $29E07 sn 15734 10010 2 IX(M); 11g (M).

30 C258) 10010 2 TL(M);11Ig(M); No flare
or radio bursts reported.

1979

Jan 1 0223-0330 — $35E00 if 15739 01030 4 IL and IV (M,DKM);IIIG
But note that Culgoora radioheliograph places source of Type IV (4, DR).
(0251-0321 UT) at 1.5 RO, P.A. 315° - at NW limb.

2 = (2253 UT) 00013 IL(M) ; LLIG ,V(DCM,M, DKM) 5
Culgoora radioheliograph places source at 1.5 RO, P.A. 75° ~ No flare reported.
possibly region 15750 at NE limb.

3 0601-0633 N20E70 1b 15750 01012 4 ILM) 5 LLLG ,V(DCM,M,DKM) «

535-1655 S14W47 sb 15733 10132 7 IVN(DCM) ; ILIG ,V(DCM,M,DKM)

3 f aud } Type IV follows max. at
1600-1612 N27E64 sn 15750 10131 6 1605 UT common to both

flares.

3 2143-2214 $12W02 sb 15741 10110 3 TI(DCM,M) 5 IIIg,V,U(DCM,M,
DKM).

5 9010-0107 $1954 tn 15748 02010 12 II(M,DKM);Flare importance

~— called 3 by one station,
but sn by another.

6 0005-0101 $2053 en 15742 00130 4 TI(M); IV(DCM) .

8 0223-0317 —NI7E52 1b 15754 21232 10 GB, 10cm flux = 595; II
(M,DKM) ; 1V(DCM,M) .

11 0057-0116 —_$24B60 if 15762 o1110 3 TI(M) 5 ITIG ,V ,U(M,DKM) «

‘But note that Culgoora radioheliograph places source.of Type II
at 2.0 RO, P.A. 45° ~ beyond NE limb.

11 0739-0812, s19W25 1b 15748 31200 6 10cm flux = 120;I11G(DCM)

13 N18WOS In 15754 11113 7 TIC).

4 NI7W19 sn 15754 10212 6 10cm flux = 325;11(M).

15 S21W75 In 15748 01010 2 IL(M)

16 s20W15 In 15762 31100 5 IIIG(M).

2 S285 sb 15762 20212 7 10cm flux = 140;11(M);IIIG
(DCM,M).«

25 0317-0402 $14E20 sb 15785 30000 3 ILIG ,V(DCM,M,DKM);1S,DC(M)

Feb 1 (0436) 00010 1 IL(DCM,M);No flare
reported.

1 0755-0905 $22E57 3n 15800 23102 8 TLTg(M) 51M).

5 S21B49 1b 15808 21113 8 IL(DCM,M) ; ILIG(DCM) «

5 S18E43 1b 15808 21113 8 IE(DCM,M); Also IV (DCM,M)

6 min, duration.

8 N13E04 sn 15807 00010 1 TI(M) ; ILIG(M, DKM) «

12 835827 an 15816 10111 4 11(M); ILTg, V(DCM,M,DKM) «

16 ‘NL6ES9 3b 15830 13434 15 GB, 10cm flux = 30,000; II
(DCM, M,DKM)  IV(DCM,M) 5A
great optical and radio
flare.

17 1905-1940 -N16E28 en 15830 10120 4 II(M,DKM) ; CONT(M) ; LTTg,V
(M,DKM) .

18 0637-0720 —_N1BE16 1b 15830 21223 10 10cm flux = 237511(DCM,M);

See notes to Table 1 on page 20.

15

CONT(M);A strong “radio”
flare, especially at meter
wavelengths.



TABLE 1

COMPREHENSIVE FLARE INDEX FOR “MAJOR FLARES", 1975-19797
TIME (UT) McMATH Ha FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE or _Eventtt post Tron IMP, NUMBER abcde INDEX REMARKSTM
1975
Jan 6 NO4E20 In 13409 01132 7 IV(DCH,M) ITI, V UC)
12 NO4ESO en 13422 ooo12 3 TI(M) 5 11g ,V(DCM,M,DKM)
Mar 2 (1640-1835) 00031 4 IV(M,DKM) ; 1Tg(M,DKM)
No flare reported.
Jun 24 (1635) 00010 1 II(DKM);No flare re~
ported.

30 (2301) 00032 5 IV(M,DKM);No flare re~
ported.

Jul 2 1622-1637 NOGW31 In 13738 11032 7 IV (DRM) 5 1L(M,DKM) 5 LIIG,
— ‘UCDCM,M,DKM) ; CONT(M,DKM)

3 (0330) 00010 1 TI(DKM):No flare reported

24 NOBE4O In 13777 01011 3 ‘TL(M, DM) ; ITTg(M, DKM)

27 NO9W19 sf 13783 00030 3 IV(DCH,M) ; LTZG(DCM,M)

Aug 1 2252-2257 NO7WIS sf 13777 00010 1 TL(DCM,M) ; 11Ig(DCM)
3 O112. Culgoora Radio ~ Region 10010 2 TI(M); LTIG(M).
fistfogron Source} 13777, No flare reported.
is P.A.310°,1.6Ro) = NW Limb

3 0323-0455 NO9E28 1b 13786 21222 9 II(M) ; IIL g(DCM,M,DKM) 5
CONT(DCM,M,DKM) .

3 0441-0454 NILES on 13790 10130 5 IV(DCM,¥) ;I and CONT
(DCM,M) In progress.

3 1218-1230 —_NOSE79 In 13790 31000 4 s(M)
3 “T306-1318 —NO6E24 sf 13786 00030 3 ILM, DKM) 5 1V(DKM) 5 18(M)

4 1128-1150 NO6E08 sf 13789 10010 2 TL(DCM,M) ; TITg(4)

21 N28W72 sb 13811 20112 6 TL(DCM,¥) ; Ig ,V (14)

21 N26W75 1b 13811 21233 u IL(M,DKM) ; 1V(DCM,M); ILIG,
V(M,DKM)

21 1523-1545 S06W8O on 13796 20031 6 IV(M, DRM) ; CONT(DKM)

21 1947-2010 N26 W77 sb 13811 20112 6 TI(M); 111g ,V(M,DKM)

22 ‘0108-0144 =—N27WBL 1b 13811 21233 uw TI(M,DRM) ; 1V(DCM,M,DKM)
ILIG ,V(DCM,M,DKM)

22 0509-0540 N27WB5 In 13811 24112 7 IL(M); ITIG ,V(DCM,M,DKM)

22 0553-0630 © N27WB4 1b 13811 11012 5 II(M) ; ILIG ,V(DCM,M,DKM)

22 TO2I-1045 =—N26WBS 1b 13811 3101 6 IIIg(DCM,M,DKM)

22 1158-1252 N27 88 ib 13811 21131 8 ‘TE(M) 3 IV(DKM)

27 “Co608y 00010 1 IL(M);11Ig,VQM)5
No flare reported.

Sep 1 (0604) 00010 IL(M) 5 ITIG,V(M);
No flare reported.

Oct 8 2341-2350 — N32W21 sf 13875 00012 3 ILM) 5 ILIg(DCM)

Nov 6 115-0138 — NO2E64 In 13926 11010 3 II(H) ; I1Tg(DCM,M)

14 0409-0423 SOBE78 In 13937 11222 8 TIM) ; CONT(DKM) ; ILIG,V
(DCM,M,DKM)

15 1141-1225 SOBES9 In 13937 11131 7 II(M); IV(M,DKM) ,Poseible;
ILIG(DCM,M)

15 1847-2000 SO6E60 sn 13937 00132 6 ‘IV(M,DKM) ; 1(M,DKM)

16 0538-0621 S07 E47 Ib 13937 11222 8 II(M) ; CONT(DCM,M,DKM) ;
ILIG ,V(DCM,M,DKM)

16 1450-1520 $0743 sn 13937 00030 3 IV(M, DRM) ; TETG(M)

16 2138-2226 NOS W26 sf 13926 00010 1 I(M,DKM)

19 0846-0858 SO8E07 sb 13937 00132 6 ‘Iv(DCM,M) ; ILIG(DCM,M)

20 0828-0834 © s08w03 af 13937 00032 5 IVv(DCM,M) ; ITTG(DCM,M) «
Possibly incorrect flare
association.

21 0607-0730 so7w21 ib 13937 11233 10 TI(M,DKM) ; IV(DCM,M) ; IITG,
‘V(M,DKM)

26 © (2228) 00031 4 II and IV(M,DKM). No
flare reported. Active
region 13937 is at SW
Limb.

Dec 8 1418-1433 NOSWS52 lf 13964 01030 4 ‘TV(M,DKM) 5 18()
1976
Jan 12 0406-0418 S11E78 en 14029 10010 2 IL(DXM) ; LT1G(DCM,M,DKM)

See notes to Table 1 on page 20.



APPENDIX OF “LESSER EVENTS" FOR 1975-1979

TIME (UT) McMATH Ha FLARE COMP.
OF FLARE a PLAGE PROFILE FLARE
DATE © OR EVENT = POSITION = IMP. NUMBER abede INDEK REMARKS
1975
Jan 5 (1950) 00020 2 CONT(DKM) ; LLIG(DKM) ; No - oe
flare reported.
9 2023 N16E66 en 13423 00121 4 CONT(M,DXM) ; ITIG,V,U
(M,DKM)
Feb 6 (2007) 00026 2 CONT(M,DKM) ; IS ,ITTS(M)
No flare reported.
8 (2100) 00020 2 CONT(DKM) ; IS, ITIN(M)
No flare reported.
Mar 16 (2207) 00020 2 CONT(DKM);No flare re~
ported.
17 (1640) 00020 2 CONT(M,DKM);No flare re~
ported.
Jun 5 (1916) 00020 2 CONT(DKM);No flare re~
ported.
19 1140-1200. NooW75, 2£ 13722 02000 2 No radio events reported
with this flare.
28 (1458) 00020 2 CONT(DKM);No flare
reported.
30 1915-1946 = NLOWO2 sf 13738 00021 3 CONT(DKM) ; ILIG,V(M,DKM)
Jul 1 (1935) 00020 2 CONT(M,DKM);No flare re~
ported.
2 (2010) 00020 2 CONT(M,DKM);No flare re~
ported.
26 (1809) 00020 2 CONT(M,DKM);IN(M); No
flare reported.
28 (1800) 00020 2 CONT( DRM) ; IT1g(DKM) ;
No flare reported.
29 1220-1236 NO8W53. en 13783 00031 4 IV(DKM)DUR,5 MIN; LIIG
(Deu, M, DKM) ; CONT(DKM)
29 (2007) 00020 2 CONT(DKM) ; ITIg ,V(M,DKM)
No flare reported.
30 (1309) 00021 3 CONT(M,DKM);No flare re~
ported.
Aug 1 (1917) 00020 2 CONT( DEM) ; II Ig ,V(M,DKM)
No flare reported.
1-2 2357-0044 — NOSE44 sf 13786 10122 6 ‘CONT(DCM,M) ; ITTg(M,DKM)
2 0915-0945 —NO6E37 sn 13786 20100 3
2 1023-1029 = NOSE38 sf 13786 20000 2
2 1043-1130 —_-NO7E90 sb 13790 20000 2
4 T446-1513 —_NO2E08 sf 13786 00020 2 ‘CONT(DKM);IN,In prog.
6 TOIT. NOGWL4 sn 13786 00020 2 CONT(DKM) ; IIT g( DCM)
7 2a) NOSW31. sn 13786 20120 5 ITI g(DCM) ;1(M) ; CONT(M,
DKM)In prog.
10 NOSW71 In 13786 21020 5 ‘CONT(DKM)
10 NOBWOS In 13790 11020 4 ‘CONT(DKM)
10 NOAW7L sn 13786 21101 5 CONT(DKM)In prog;
ILIG(M)
10 1833-1925 NOBW17 sn 13790 20100 3 CONT(DKM)In prog.
14 = 1031-1120 NO769 In 13790 21000 3
14 T1450) 00020 2 CONT(DKM);No flare re~
ported.
Oct 21 (2112) 00030 3 IV(DKM),7 Min, Duration;
No flare reported.
S09E45 en 13937 20000 2 No radio events reported.
807831 sn 13937 10223 8 CONT(DKM); Strong DCM and
M-) radio bursts.
00020 2 CONT( DKM) ; IIIg(DCM,M,DKM)
Jan 13 (1920) 00020 2 CONT(DKM);No flare
reported.
Mar 20 1356-1408 —_NOSW20 sf 14127 00020 2 CONT(DKM)
20 1752-1815 No2wa2z sn 14127 10020 3 CONT(DKM) ; TLTG(M,DKM)
2 CITI® 20000 2 No flare patrol 1111~

1230 ur.

21



WORLD DATA CENTER A
for
Solar-Terrestrial Physics

REPORT UAG-80

EXPERIMENTAL COMPREHENSIVE
SOLAR FLARE INDICES FOR
“MAJOR” AND CERTAIN LESSER FLARES
1975-1979

iy
Co

July 1981



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES"

1975-1979 (continued)

TIME (UT) McMATH Ha FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE or _gvenr tt PostTiLoN Imp, NUMBER abede INDEX REMARKSTM
1977
Nov 4 (2347) 00010 1 I1(M);IIIb,U(M);No flare,
reported. Culgoora radio
heliograph places source =
at E, Limb (1.2 RO, Ped.
115°). There is some con-
fusion as to whether this
event occurs on Nov. 4 or
Nov. 5.
7 0531-0830 $2345 In 15016 01031 5 TE(M,DKM) ; 1V(DCM,¥) ;UNCL
(oem)

20 (0259) 00010 L II(M);No flare reported.

22 0945-1108 N24W40 2b 15031 22332 12 GB,10cm,Flux = 1400;1V,
(DeM,M);ITTg(M); A strong
“radio” flare.

27 (0616) 00010 1 II(M); No flare reported.

Dec 6 1651-1657 S20W11 sn 15049 00133 7 Iv(DCM,M,DKM) ,But_very
short duration; IIIg,
V(M,DKM)
6 ©1935-1945 S18W18 sb 15049 10214 8 10cm Flux = 1165 11(M,DKM)
ILIG,V ,U(DCM,M,DKM)
8 0151-0256 — S26E41 ln 15056 11010 3 TI(M)

10 0301-0402 S27 E16 1b 15056 21232 10 1cm Flux = 132;11(M),1V
(DCM, M) ; CONTC(DKM) «

10 0613-0618 —NI6E90 sn 15067 00010 1 IL(M)  ILIG ,V(M,DKM)

17 DI27-0132_NI8E10 sb 15067 00010 1 TL(DKM), but unconfirmed.

17 0330-0410 © $33W90 sn 15056 00010 1 TL(DKM), unconfirmed; IIIb
u(M).

22 (2354) 00010 1 TI(DKM) Unconfirmed. No
flare or radio bursts re-
ported.

24 — (1307)* 1-112 25 LI(M) 5 ILIG ,V(DCM,M,DKM) «
No flare patrol 1240-1310

24 (2303) 00010 1 E(DKM) 5 INCH) «

No flare reported.
26 ©0150-0157 S26WS57 sf 15074 20112 6 rr(M)
829560 sf 15074 00012 3 TL(DKM), Unconfirmed.
82668 sn 15074
N24B56 sf 15079 10010 2 TX(M) 5 LLT6(M)
817890 sn 15081
S25W79 In 15074 11231 8 IE and 1V(M);IN(DCM,M)
82713 sf 15077 10231 7 10cm Flux = 480.
00010 1 TL(DKM); Unconfirmed.
IlIg,N in prog. No flare
reported.

28 S1BE64 sf 15081 00020 2 TI(DKM) 31 & CONT(DCM,M)

30 (0406-0432 $1638 In 15081 21211 7 10cm Flux = 3003 IT(M);
ILIG,U(DCM) .

31 0330-0340 S16E49 sf 15083 00010 1 TL(DKM), Unconfirmed.

1978
Jan 1 821806 2n 15081 12230 8 GB,10 CM, Flux = 650;
$1928 sn 15083 10230 6 ‘Iv (DOM, M) , LTC, DKM) 5
Simultaneous flares in
adjacent regions.

3 $15806 1b 15083 11232 9 II and IV (1)

7 S19W71 sn 15081 20233 10 IV(DCM,M);Strong radio
bursts at all wavelengths

8 20079 2n 15081 32232 12 IV(DCM,M) ;IT(M) ; LIIG,V
(4, DKM)

8 12685 2b 15081 22132 10 IV(DOM, M4) ; TEC) 5 IITG(M)

9 S19W90 sf 15081 20111 5 IL(M);IIIg,V(M)

10 (2328) 00012 3 TI(M,DKM) ; III ,V(DCM,M,

Culgoora radioheliograph places moving source of Type IV at
0.8 to 3.0 RO, P.A. 270° (probably active region 15081, at

and beyond west limb).

11 0256-0359 NISW31

30 © (0325)

31 (0343)
Feb 3 1250-1304 — $26W22
7 0822-0900 © NI7E08

See notes to Table 1 on page 20.

sf

sf

sn

15092

15124

15135

00010
00010
00030
00030

00010

DKM);No known reliable
flare.

11M)

II(M);No flare reported.
TV(DKM) 5 TLL(DKM) 5

No flare reported.

IV(M) Also continuum
emission all day.
II(M);Flare association
doubtful.



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES", 1975-1979 (continued)

TIME (UT) McMATH Ha FLARE COMP .
OF FLARE Ha PLAGE PROFILE FLARE
DATE oR EvenT tt Postion IMP. NUMBER abcde INDEX REMARKS
1977 7
Feb 10 (0358) 00010 1 IE(DKM) ; LTIG,,V(M) ;
No flare reported. - e
14 (0013) ool 2 TI(DRM) ; ITTg (DCM, M) ;
No flare reported.
Mar 12 (0226) 00010 1 IL(M) ; LITg(DKM) ;
No flare reported.
Apr 8 (0608) 00010 1 IL(M) 5 111g, V(M)5
No flare reported.
12 0944-1037 21882 lb 14726 31221 9 10 cm Flux = 260;
_ I & CONT(DCM,M); ILIg
u(DCM)
16 2307-2442 S21E18 1b 14726 11120 5 II(M) ; CONT(DCM) ; IIT g
21 1527-1550 S18W44 sn 14726 00011 2 IL(M) ; LI1G ,U(DCM,M,DKM)
21 (2229) 00010 1 IL(M); 111G(DCM,M) ;
No flare reported.
May 19 0015-0100 $1839 sb 14771 10010 2 TE(M) 5 LIIb(M)
Jun 2 (0430) 10011 3 TL(M) 5 IT1G(M, DKM) ;
No flare reported.
23 (0021) 00011 2 II(M) 5 L1Tg(DCM,¥) ;
No flare reported.
23° 2111-2122 S24E26 sn 14815 00013 4 IL(M); [LIG,V,U(DCM,M,DKM)
Jul 10 (0251) 00010 1 IL(W);No flare reported.
19 (2307) 00130 4 IV(M);No flare reported;
MM and CM radio bursts.
Aug 26 0542-0549 $2506 sn 14915 10112 5 TI(M) ; ILIV ,U(DCM,M,DKM)
Sep 5 (0921) 00010 1 TI(M); 11Tg(M);
(Perhaps active region 14943 No flare reported)
on invisible hemisphere)
5 (1954) 0021 3 TX(M, DRM) ; CONT(DKM) ; LIT
(M,DKM);No flare reported
7 2255-2402 NO7E9O In 14943 21333 2 GB, 10cm,Flux = 1370; II

and IV(DCM,M,DKM) ;IIIG,
V(DCM,M,DKM);A strong
“radio” flare at all freq

9 1630-1703 NOBE84 In 14943 21332 ul GB,10cm Flux = 1100511
(M, KM) ; IV (DCM, M, DKM) ILIG
V(M,DKM);Great radio
bursts at mm and cm wave~
lengths.

NO7W20 2n 14943 22333 13 GB, 10cm,Flux-14803 IL(M,
DEM); IV(DCM,M);Great ra~
dio bursts at CM,DCM and
M wavelengths.

19 0955-1205 NOBWS7 3b 14943 33232 13 10cm Flux = 825;11(M),1V

(M) ,ITIg(M);A great
“radio” flare at MM and
CM wavelengths.

20 0251-0742 No9w59 2n 14943 22232 u 10cm Flux =350; I1(M);1V
(DCM,M) ;IZIg(M)

24 (0552) 00133 7 TEC) ; TV(DCM, 4) ; ILIG,V
(Region 14943 is on invisible (DCH,M,DKM); ‘No flare
hemisphere. One day beyond west limb) reported.

Oct 3 2356-2406 —NL3W31 sf 14963 00030 3 Tv)

4 (2325) 00031 4 IIIg,V(M);No flare re~
(Perhaps active region 14979 on ported. Culgoora radio
invisible hemisphere, beyond E limb) heliograph places source

at SE limb (1.4 RO,P.A.
130°).

6 0425-0500 —_N31W59 In 14967 21233 u II and 1V(DCM,M);IIIG,V

(DeM,M,DKM)
12 0150-0215 NO6WO2 1b 14979 21233 n 10cm Flux = 4203 11(M,DKM)

IV(M); ILIG,V(DCM,M,DKM) «A

great “radio” flare at

all frequencies.
31 0411-0430 N20B70 sn 15017 10112 5 IL(M) ; TTTG(DCM,M)

See notes to Table 1 on page 20.



1979
Jan

Feb

1S
15

15

PENDEN, OF MIQSSER EVENTS" FOR [875-1979 (ont tmued)
TIME (UT) McMATH Ha FLARE come.
OF FLARE, He PLAGE PROFILE, FLARE,
TLON IMP. NUMBER abede INDEX REMARKS
S23E58 sb 15694 10204 7 10 CM Flux = 139;TIIG,
V(M);Strong radio bursts
at all frequencies, es~
pecially at DOM and M
wavelengths.
0204-0218 S31 W9C sn 15684 20000 2 LLIG(DCM,M,DKM) ; 1S(M)
1950-2045 S17 36 sb 15694 10123 7 18, C(M); LL1g(DCM) 5 ILIS
. (M4, DRM)
0341-0404 — S17E23 sf 15697 10020 3 Is,c(DeM)
S13E15 In 15697 11020 4 conr(DCM,M)
S17¥56 sn 15694 20020 4 1S,DC,CONT(M) ,TZIN(M)
N2100 sf 15700 20000 2 No DYN. SP events reported.
$1760 In 15694 21102 6 No DYN. SP. events reported.
S18W61 1b 15694 21203 8) 10 CM Flux = 185 and 46;
S22W14 en 15696 20103 6) ILIN(M); Strong radio
bursts at all wavelengths
Simultaneous flares.
S19W74 2b 15689 12000 3 IIIN(DKUM);No radio bursts
reported.
818066 In 15694 11020 4 IS ,C(M) ; LLLG(M,DKM)
$1867 1b 15694 21000 3 LETb(M, DEM) 5 1S(M)
S17W68 2n 15694 12000 3 IIT g(M,DKM)
S16H70 sn 15694 20102 5 No DYN. SP. events reported.
O717-0731 $1782 1b 15694 21100 4 TIIg UCM)
W343-0406 —-N2ON10 sn 15704 20100 3 TLL g(M,DKM) 5 ILINCM)
(2355) 00200 2 10 CM Flux = 133; 1TIg(M)
(Possible source, from Culgoora radioheliograph, of No flare or SID reported.
Type ILIg, is 0.1 RO, P.A. 130°.)
0936-0952 NI8WBS 2n 15744 12000 3 No Dyn. Sp. or radio
events reported.
1931-2013 NI6W10 In 15754 21100 4 No Dyn. Sp. event re~
ported.
0712-0755 NLSW35 2n 15754 02100 3
02 $2325 sn 15757 20102 5 TITg()
$1878 sf 15748
25627 sf 15757 20203, 7 10 GM Flux = 117; Numer-
$18W79 In 15748 21203, 8 ous flares during common
$22W02 sn 15762 20203 7 SID, 1338-1410 UT — Are
N1SW36 sn 15754 20000 2 they related?
s2iwi2 sn 15762 10200 3 10 cm Flux = 206; IIIg
(pew)
12224-2324 — N20WS4 2n 15754 02101 4 IIIg(DCM). “Simultaneous
(2262-2311 © $27 W07 sf 15762 oo101 2 flares” with approx. same
~ max. (~ 2250 UT).
0425-0435 -NL4W73 2n 15754 02000 2 TITg(M,DkM) -
417-1558 $26E24 1b 15786 11200 4 No Dyn. Sp. or Meter
wavelength events re~
ported; 10 cm flux = 294
0453-0536 NI2WS52 sn 15777 00200 2 10 cm flux = 133; TLTb(M)
0903-1026 21890 In 15808 21002 5 IITg(M)
0347-0416 — S19E27 an 15808 21200 5 10 cm flux = 116
0202-0352 $20B15 In 15808 21222 9 10 cm flux = 102;CONT(M)
0712-0842 -NI2B15 In 15807 21000 3
0734-0820 NI3WOS 1b 15807 21000 3 10)
0949-1040 NISW27 2E 15807 02000 2
1223-1314 — N12W32 1b 15807 11203 7 10 em flux = 200; 1TIU(M)
TOO0-0204 —_NI6W36 In 15807 21121 7 1S ,DC, CONT(M)
0546-0611 = NI5W38 sn 15807 20000 2 IITg VC)
1948-2031  S34E16 1b 15816 11202 6 10 cm flux = 126;1LIg,V
(DOM, M,DKM)
1245-1312 NIBELO sn 15823 10202 5 10 cm flux = 130;11IG
(oem, 4)
2136-2216 NIBEO8 sb 15823 10202 5 10 cm flux = 166;I1IG
(DOM,M, DKM)
(2235) 10200 3 10 cm flux = 189; No
flare reported.
{0004-0048 — NIBE08 en 15823} 10200 3 10 cm flux = 430; ILIG
OO13-O100 = NIOE40. sn 15830) (DCM, M) «
0225-0330 N1BE06 In 15828 21201 6 10 cm flux = 462; ILIG
(DCM, M,DKM) «
1900-1924 — N18WO1 sn 15823 10120 4 ConT(M) ; IIZg ,V(M,DKM)
1652-1731 — NO6WI7 sb 15836 00202 4 10 cm flux = 236;ILIG,V

28

(DCM,M,DKM); IV in
progress



Aug

Sept

an

22

28

12
13

APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)

TIME (UT) McMATH Ha FLARE COMP.

OF FLARE Ha PLAGE PROFILE FLARE

OR EVENT POSITION IMP. NUMBER abede INDEX REMARKS

{0900-0943  NI8E32 sn 15403, 20100 3 ILIS(H);

10900-0925 = NI7W68 sn 15409 Flare~ambiguous.

000-1035 NI7E31. sn 15403 20002 4 IIIg(DCH,M)

NL6E28 en 15403 10204 7 10 CM FLUX = 118;ITIG,V
(DCM,M);Strong radio
bursts at all wavelengths

N16E28 sn 15403 10023 6 Le(M) ; LTIG, v(DCM,M,DKM)

NI7E25 ib 15403 21122 8 Is, C(M) ; LLIG ,V(DCM,M,DKM)

S20W45 sn 15400 20122 7 IIIS(M) ; Flare—ambiguous
association with SID.

NL6WOL 1b 15403 21103 7 ILIG ,V(DCM,M) ; LINC)

NI8W1L 1b 15403 11203 7 10 CM FLUX = 450;IIIG,V
(DCM,M);Strong radio
bursts at all wavelengths

N1BW44 sn 15403 20000 2 No DYN. SP. event.

NI7W90 In 15403 21000 3 IEIN(M) ; ILTg(DCM,M)

N18we8 2£ 15403 02000 2 No SID and no radio
events reported.

N14W6L sn 15410 10020 3 1¢(DCM,M)

10201 4 10 CM FLUX = 430;No DYN.
SP. event and no flare
reported.

1857-1926 -N17W90 1b 15403 21200 5 10 CM FLUX = 126;No DYN.
SP. event reported.

(1315) 20001 3 IITg,V(M);No flare re~
ported.

N27W26 sf 15428 00021 3 I¢(M)

(1513) 0021 3 IC(M);No flare reported.

(0530) 00020 2 IN,C(M);No flare or SID
or radio bursts reported.

1325-1406 $2676 In 15454 21000 3 No DYN. SP. event re~

. ported.

1530-1703 NI18E65 1b 15508 21221 8 10 CM Flux = 170; conT(M)

0526-0603 NISES7 In 15508 “ 21000 3 IN(DCM) ; ITT g(DCM,M)

1237-1320 $35R65 sn 15509 20000 2 IITg(4)

1807-1825 S39E68 sn 15509 00020 2 CONT(M) ; ITZN(DCM,M, DKM)

S33E45 2n 15509 12100 4 TIIS(M)

0533-0621 $3243 2b 15509 22220 8 10 CM Flux = 105;1IIs,
C(M);Strong radio bursts
at MM and CM wavelengths.

1131-1212 §30E37 In 15509 11120 5 CONT(H) ;IV(M),6 min,
duration.

1305-1327 $31E39 sb 15509 20100 3 I1EG(DCM)

(2135) 00120 3 Is ,C(M) ; II1G,v(DCM,M,
DKM);No flare reported.

0035-0120 NISW18 sf 15508 00020 2 IS,C,DC(DCM,M) ; IIIg
(4,DKM)

(0230) 00020 2 IS ,C(M) ; LITg,V(DCM,M,DKM)

Culgoora radioheliograph places source at 0.5-0.8 RO, P.A. 330° No flare or SID or radio

(Northwest quadrant, perhaps active region 15508 on disk) bursts reported.

0515~0538 —-N22E90 2£ 155237 12022 7 IDC, CONT(M) ; ITIS(44)

(0429) 00020 2 I8,C,DC(M);No flare or
SID or radio bursts re-
ported.

0623-0705 —-N35W62 2n 15543 12000 3 ILIg(M);No radio bursts
reported.

2217-2250 -N28WO7 In 15551 11122 7 I8,C,DC(M) ; LIIb(DCM)

(143) 20101 4 ILIG,V(M);No flare re~
ported.

2342-2353 $2187 sn 15582 20100 3 (DCM) ; IS ,DC(M)

0944-1002 s19W90 sb 15582 20100 3 11g(M)

0027-0109 = N28E61 2n 15598 12000 3 IS(M);No radio burets
reported.

0406-0439 —-N2SE77 2n 15610 21100 4 No DYN. SP. events.

0556-0638 © $2324 qb 15611 01020 3 IS,C(DCM,M) ; IITg(DCM,M)

1210-1225 N24E40 sn 15651 00023 5 CONT(M) 5 ITIG,V(M)

121 18023 sf 15643, 00023 5 Simultaneous sub-flares

122. S10W54 an 15641 00022 4 in widely separated re-
gions, with onset of con-
tinuum emission.

0619-0630 N16W31 sf 15643 00020 2 CONT(M) ; IZID(M) ; 1S(DCM,M)

0819-0848 —NZ1N46 en 15643 20100 3 No DYN. SP. events.

27



e. All flares not contained in the list of “major” flares for which continuum emission in the radio
spectrum was reported. The frequent reports of day-long continuum without flare association are not
included in this tabulation.

This compilation of comprehensive flare indices for so-called “lesser” flares contains 549 entries, 68 of them
for flares of Ha importance 2. There were only two cases of indices as great as 9 and 10 respectively. Apparent-
ly the listing of “major” flares in Table 1 picks up practically all instances of flares with comprehensive
indices as great as 9. See Figure 1 for comparative distributions of comprehensive indices for “major” or “less~

er" flares reported in this study.

“Major” flares, 1975-1979

a) Total number, 541 |
£ With CFI > 10, 55
2 40 J
20 4
0 fa 1 id
1°35 7 9 1 13°15 17
CFI
160 tt
140 “Lesser” flares, 1975-1979 J
120 4
100 4
5
E
3 80 Total number, 549
With CFI > 10, none
60 4
40 4
20 4
0 bitiiit

1 3 5 7 9 11 #13 15 #17
CFI

Fig. 1 Distribution of “Major” and “Lesser” Flares by Comprehensive Flare
Index (CFI), 1975-1979,

ACKNOWLEDGEMENTS

The authors acknowledge with gratitude the help and encouragement of Dr. E. C. Roelof of the Applied Physics
Laboratory of The Johns Hopkins University in the preparation of this report. This effort was supported by the
Air Force Geophysics Laboratory via Task I of Contract NO0024~81-C-5301 between the U. S. Navy and JHU/APL.



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES", 1975-1979 (continued)

TIME (UT) McMATH = Ha, FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE oR Evenrtt posrrrow IMP. NUMBER abcde INDEX REMARKS?
1979
Aug 14 1240-1451 827876 In 16224 11332 10 GB,10cm flux = 4030;1V
— (DCM,M) 5A great “radio
flare”.
14 1542-1554 $2377 1b 16224 11202 6 10cm flux = 535; IIIG,V
— (4, DKM) .
$17W48 en 16205
14 { 10110 3 IL(M); LLIG,V(DCM,M,DKM) .
2051-2100 $23E68 sb 16224

16 (0438-0627 © $2753 2n 16224" 22231 10 IE & IV(M);1IEg(DCM,M) 5
10cm flux = 140,

16 S25E47 en 16224 00131 5) X(M) 5 TV(DeM) .

NIBE25 1b 16218 01131 6!

18 20233 10 IL & IV(M);TIIg,U(DCM,M) ;
10cm flux = 490; A strong
“radio flare” at all freq;
Two minor sub-flares in
regions 16224 (S25E17) and
16239 (NOBE90) have poor
time relationships with
radio events.

20 © 0905-1040 NOSE77 2b 16239 32232 12 T1(M) ; IV(DCM) ; III g(M) 36GB,

oe 10cm flux = 990;A strong
“radio flare” at all wave~
lengths.

21 0550-0658 = NI7W48 2b 16218 12131 8 II(M) ; 1V(DCM,M) 5 ITIG VM).

22 0155-0254 NOSESL In 16239 01030 4 Iv(M);IIIb(M,DKM) .

22 2340-2410 = S22E75 In 16245 11110 4 TL(M) 5 LIIN(M) «

23° T244-1451 N07 #29 In 16239 21232 10 TV(DCM,M); 10cm flux = 124.

26 0130-0251 —s14w60 2b 16231 12030 6 IL & IV(M);11Tg(M,DKM).

26 1615-2200 © NOSWI1 2b 16239 22230 9 IV(DCM,¥) ; ILEG(DCM,M,DKM) 5
10cm flux = 400.

Sep 2 0006-0131 — $20E67 In 16267 11231 8 IE & IV(M);IITg,vV(M); 10
em flux = 143.

3 0425-0517 $23E56 In 16267 21131 8 IL & IV(M);11Tb(M).

7 Q055-O116 s17W06 1b 16267 11113 7 TI(M, DKM) ; IIIG ,V(M, DEM) «

7 948-2005 s17wi7 sb 16267 10110 3 II(M,DKM) ; ITIG ,V(M, DRM) «

8 0019-0032 -s15wi8 sf 16267 00110 2 II(M); IL1G,N(M,DKM) .

10 0515-0535 © s22w47 2b 16267 12113 8 LI(M); IL1G,V(DCM,M, DM) «

11 0628-0638 = (NISW71. sf 16269 00030 3 IV(DCM) ;No SID or single

- freq radio events reported

11 1555-1608 822066 sb 16267 10010 2 II(M); I1Tg ,V(DCM,M)

14 (0656: 30030 6 II & IV(DCM,M);IITb(M); No
flare reported; Active re~
gion 16267 is at SW limb.

S14E56 2b 16295 10cm flux = 104; ITIG(DCM,

15 32201 8 ¥);Simultaneous flares at

1020-1040 N06E90 2b 16298) time of major SID.

16 “OLOT-0124 = NOSE90 sn 16298 30210 6 II(M) INCH).

17 (065%) 00303 6 GB,10cm flux = 4089; No
flare or SID reported.

18 (0403) 00010 1 II(M);No flare or SID re-
ported.

19 2256-0103 NO6E33 3b 16298 33300 9 GB,1l0cm flux = 1520;Strong
radio bursts at MM & CM
wavelengths.

30 1040-1140 $2790 In 16306 11132 8 IV(DCM) ; LITg(M) «

Oct 4 1554-1747 NL4E76 sb 16344 20210 5 10cm flux = 148;11(M);
IITg UCM) «

5 1130-1240 -N14#59 an 16344 22233, 12 10cm flux = 254; 11(DCM,M);
IV(DCM,M);IIIg(DCM); A
strong “radio flare” at
all frequencies.

5 (1549) 00030 3 IV(DCM);No flare reported.

1405-1437 $20W62 1b 16346 11200 4 GB, 10 cm flux = 610;

7 {TAOS-1435 © N16E33 1b 16344 11200 4 IN in prog.

T414-1442 — N2GE23 sn 16341 10200 3,

12 “‘D515-0615 —NOBES6 2n 16363 12010 4 TL(M) 5 IITS(M) «

19 O41S“O446 = -N2GE21 2n 16373 32200 7 10cm flux = 280; IIIb(M).

19 T1S3-1335N28E13 2b 16373 22300 7 GB,l0cm flux = 1825;No dy-

~ namic spectrum events;
strong radio bursts at MM
and CM wavelengths.

26 (0635) 10010 2 TIM); LIT g(M) ; INCDCM,M) ;

See notes to Table 1 on page 20.

18

No flare reported.



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UAG-16 "Temporal Development of the Geophysical Distribution of Auroral Absorption for 30 Substorm Events in each of
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UAG-17  "Ionospheric Drift Velocity Measurements at Jicamarca, Peru (July 1967 - March 1970)," by Ben B. Balsley,
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UAG-18 "A Study of Polar Cap and Auroral Zone Magnetic Variations," by K. Kawasaki and S.

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UAG-22 “Auroral Electrojet Magnetic Activity Indices (AE) for 1970," by Joe Haskell Allen, National Geophysical and
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35

1



‘UAG~25,

UAG-26

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UAG-48A

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February 1973, 35 pp, $0.35. ~

"Data Compilation for the Magnetospherically Quiet Periods February 19-23 and November 29 - December 3,
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"High Speed Streams in the Solar Wind," by D.S. Intriligator, University of Southern California, Los Angeles,
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“Auroral Electrojet Magnetic Activity Indices AE(11) for 1968," by Joe Haskell Allen, Carl C. Abston and
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“Auroral Electrojet Magnetic Activity Indices AE(11) for 1969," by Joe Haskell Allen, Carl C. Abston and
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"synoptic Radio Maps of the Sun at 3.3 mm for the Years 1967-1969," by Earle B. Mayfield, Kennon P. White
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"Auroral Electrojet Magnetic Activity Indices AE(10) for 1967," by Joe Haskell Allen, Carl C. Abston and
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"Absorption Data for the IGY/IGC and IQSY," compiled and edited by A.H. Shapley, National Geophysical and
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“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, $1.15.

“Catalog of Observation Times of Ground-Based Skylab-Coordinated Solar Observing Programs," compiled by Helen
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"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
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Tousey, C.R. Detwiler, D.E. Roberts, R.T. Seal, and J.D. Whitney, U.S. Naval Research 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.

36



APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)

TIME (UT) McMATH Ha FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE

DATE OR EVENT POSITION IMP. NUMBER abede INDEX REMARKS

1977

Dec 9 (0034-0054 — N26E70 en A group of Type II(DKM)
and 15061 00010 1 between 0045 and O117 UT
0055-0117 N24E70 en reported by Manila. IZIN

in prog - CLG.
9 0212-0317 S26E26 sf 15056 00010 1 TI(DKM) , (MAN) ,Not_con~
— firmed by CLC.

9 (0325) 00010 1 IL(DKM) :Unconfirmed No
flare or radio bursts re-
ported.

9 (0935) 00020 2 IN & CONT(DCH,M) ; IITg(4);
No flare reported.

10 0416-0423 $2918 sn 15056 00022 4 CONT(DKM)

ql 8270S dn 15056 21100 4 Ii6(M)

12 82708 sn 15056 20100 3 IIL(DKM)

14 (0051-0347)

14 (2314-2342) Groups of II(DKM) bursts reported by Manila;

15 (0205-0213) Not confirmed by Culgoora. No flares, No Sid's

16 (0011-0014) No radio bursts are reported at these times.

17 (0155-0158)

19 0822-0910 N25E68 sf 15070 00022 4 IN & CONT(DCM,M);1Z1g(M)

24 [845-1911 =—N2LW12. sf 15070 00032 3? IV(DKM) ,DUR. 0.6 MIN.

~ ILIG(M,DKM)

25 0020.5-0021.8

0045 .4-0049 5

0110 .0-0113.0 A series of type II(DKM) bursts reported by

0344 .2-0346.7 Manila; Not confirmed by Culgoora. No flares,
0408 .8-0411.6 no SID's, no radio bursts reported at these times.
0511 .0-0513.0

0522-0525

26 (1859)* 1-131 26 Iv(M) Duration 7 min,
TIIg(M,DKM). No flare
patrol 1730-1957 UT.

26 ©2322-2400 © $27W72. in 15074 21100 4 ITIG(M, DKM)

28 085 S19E68 sn 15081 20201 5 10 cm. flux = 159;
IITb(M)

29 0902-0945 S16E77 sn 15083 20000 2 Ic in prog.

31 0349.0-0351.2 A series of Type IL(DKM) bursts reported 10 cm. long GR & F

0400 .0-0403 .6 by Manila, not confirmed by Culgoora. in prog.
0412-0415 .2 No flares & no SID's reported at these times.

1978

Jan 1 S18E36 In 15083 21101 5

2 C305 00020 2 CONT(M);No flare or
SID reported.

7 0123-0217 S21 W64 lf 15081 11422 7 CONT(DOM,M,DKM) ; LLTG(M)

7 0632-0651 —sL6w65, 1f 15081 21202 7 Strong radio bursts at MY
and CM wavelengths.

14 (2041) 00020 2 CONT(DEM,M) ; ILIS(M) sNo
flare reported.

Feb 2 1133-1155 NL9E07 sb 15126 20232 9 IV(M),6 minutes duration.

3 N20E66 In 15135 11120 5 cont(DeM) ;18,C,DC(M)

3 N20E61 sn 15135 20100 3 IITg ,N(DCM)

3 T60S“1645 —-N21E57 1b 15135 21100 4 ILLG(M, DKM)

3 2026-2158 —-N33W18 2b 15136 12100 4 ILIG,V(DCM,M,DKM)

4 (0315) 00021 3 IS,C,DC(DCM,M);No flare
reported.

4 1650-1655 $32 W45 sn 15124 00020 2 CONT(M)

5 0728-0750 «= $28£32 sf 15132 00021 3 18,C,DC(M); IIIS

8 0355-0418 = NI2E45 2n 15139 12000 3 No radio events reported.

8 1756-1802 NISE39 sb 15139 00020 2 CONT(M) ; LIT g(M) «

9 N2BW14 in 15134 21102 6 ITTg(M)

9 27420 sn 15134 20100 3 Radio bursts only at MM.
and CM. wavelengths.

NL6W27 sn 15135 20103 6 | IIIG ,V(DCM,M,DKM)

N13E22 1b 15139 21103 7

N14EO6 ib 15139 11203 7 10 CM Flux = 117;1IIG,V
(DeM,M, DKM)

N13WO8 An 15139 21102 6

NL4WOS: An 15139 11122 7 CONT(M) 3 LITg(DCM,M)

N14W31 sf 15139 00020 2 IC,DC(DCM,M) ; IIZg(DCM)

15 0718-0843 N15 W4B sn 15139 10202 5 10 CM Flux = 140;IIG
(DCM,M,DKM)

16 } 0603-0658 $3028 sn 15142 10122 6

N17W52 1b 15139 11122 7 CONT(DKM) ; ITIG(DCM,M,DKM)

16 NIOW71 sn 15139 10132 7 IV(DCM) ,7 min duration;
TLIG(M,DKM)

17 0137-0153 N12W80 1b 15139 21000 3 LEIb(DKM)

20 1609-1625 © N37E73 2b 15162 12021 6 CONT(M) 5 ITIG(M,DKM)

21 N37E62 2n 15162 12001 4 No radio events except

M-A noise storm.

24





COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES"

1975-1979 (continued)

TIME (UT) McMATH Ha FLARE COMP.
OF FLARE Wa PLAGE PROFILE FLARE
DATE OR EVENTTt POSITION Imp. NUMBER abede INDEX REMARKSTM
N21W90 dn 15266 31132 10 II and IV (DCM,M);
UNCL (DCM) +

10 2157-2240 NL9B40. 1b 15294 11030 5 IL and IV(M,DKM);IIIG,
V(M,DKM) «

11 0249-0328 N20E38 2b 15294 12030 6 LI(M, DRM) ; 1V(M) 5 ITIG
(pcm,
reported.

41 (0735) 00032 5 IL and IV(DCM,M);IIIG
(DCM,M) «

13 0742-0843 $28W70 1b 15280 11232 8 10 CM Flux = 100;1I(M);

~ IV(M,DKM) «

14 1354-1402 S28W82 sb 15280 10131 6 II(M);IV(DCM),7 min.
duration; IIIg(M).

14 (1449) 00010 1 TI(M,DKM);No flare re~
ported.

16 1607-1704 —N16W56 Ub 15291 11110 4 TI(M,DRM) ; ILIG(M,DKM) «

17 (0425Y 10010 2 IX(M);IIIN and IS,DC
Culgoora radioheliograph places source at 1.2 RO, P.A. 220° ();No flare reported.
(Perhaps from region 15296 in SW quadrant, or active region
15280 on invisible hemisphere, about 2 days beyond W limb).

18 (0516) 00031 IL and IV(M) 5; ILI g(M);
Culgoora radioheliograph places source at 1.0 RO, P.A. 240° No flare reported.

(SW Limb).

22 1433-1443 S26W44 sb 15301 00012 3 IL(M); 11g ,V(M).

23 7 -NIBE69 sn 15314 20110 4 T1(M) ; LLEb(DCM) .

24 S28W83 io 15301 uu 5 II(M,DRM) ; II g(M,DKM) «

28 N18WO7 ib 15314 31100 5 IITg(M,DKM) «

31 N20W43 3b 15314 23232 12 10 CM Flux = 143;11(M);
IV(DCM,M) ; ITTg(M) ; Strong,
radio bursts at all wave-
lengths.

June 1 2113-2115 N23W45 1b 15314 11133 9 II(M,DKM) ; 1V(M) 5 IIIG,V,,
U(DCM,M,DKM);Flare data
incomplete.

2 0258-0319 N25W46 sb 15314 10010 2 II(M) ; ITIG(DCM,¢) .

5 (2303) 00010 1 II(DCM,M);No flare, SID
Culgoora radioheliograph places source at 1.0 RO, P.A. 250° or radio bursts reported.
(Possibly region 15335 at SW Limb?)

8 (0415) 00010 1 TI(M);II1g,U(M);No flare
SID, or Radio bursts re-
ported.

11 (0214) 00010 1 TI(M);No flare, SID, or
Culgoora radioheliograph places source at 1.3 RO, P.A. 225° radio bursts reported.
(sW Limb).

18 (0415) 00010 1 IL(M); 11g ,U(M);No flare,
Culgoora radioheliograph places source at 1.1 R@, P.A. 270° SID, or radio bursts re~
(Perhaps from active region 15354, approaching West Limb?) ported.

21 0109-0123 N14W90 en 15354 00010 1 TE(M) 5 ITIG(DCM,M) ; INC) 5
No SID or radio bursts
reported.

22 1643-2240 NIBEL6 2b 15368 22232 ul 10 CM Flux = 113; 100M,

— DKM); IV(DCM,M)ILIG,V,U
(DCM,M,DKM) «

26 (1207-1237 SL6w02 sn 15375 IL(M) 1217-1230 UT;IIIg
1220-1240 1390 sf 15370 10010 2 (4);Three possible sub-
1227-1250 N20W12 sf 15368. flares in progress.

26 {1436-1456 — S16WO4 sn 15375) 10132 7 IL(M,DKM) ;1V(M) 3 ILIG,V
1440-1454  NISE78 af 15381 (DCM, M,DKM) ; EC, LLIN,

DKM); Simultaneous flares.

26 (1528) 30332 MW GB,10 CM Flux = 1160;1V
(DOM,M) ; IIIG ,V(M, DRM) 5
No flare reported.

26 (2209) 10112 5 II(DCM,M) ; III ,V(DCH,M,
DKM);No flare reported.

27 0102-0123 $1708 1b 15375 11112 6 TL(M) 3 ILIG ,V(DCM,M,DKM) «

28 0244-0307 2016 2b 15375 22214 my 10 CM Flux = 330;TI(DCM,
M,DKM) ; TIIG ,V(DCM,M,DKM) ;
Strong radio bursts at
all wavelengths
(especially at metric).

28 2108-2125 NISE48 sb 15381 0010 1 TL(M,DKM) ; ILIN(M) .

See notes to Table 1 on page 20.

ll



COMPREHENSIVE FLARE INDEX FOR

"MAJOR FLARES"

1975-1979 (continued)

TIME (UT) McMATH Hq FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
pars = on_EvENT*T posrTION IMP. NUMBER abede INDEX REMARKSTM
1978
Jul 18 1927-2010 N17 52 2b 15403 32132 ry IV(DCH,M);9 minutes
duration; ITIN(DCM).
Aug 7 1736-1758 $26E40 sf 15454 10113 6 IL(M,DKM) ; ITTG(DCM,M) «

17 (016) 00010 1 IL(M) ; LIIG ,U(DCM,M) 5
Culgoora radioheliograph places source at 1.1 RO, P.A. 65° IlTg,V(DCM,M); No flare
(NE limb) reported.

29 (0608) 10010 2 II(M);No flare or radio

bursts reported.

30 (0312) 00010 1 IX(M);No flare or radio

Culgoora radioheliograph places source at 1.3 RO, P.A. 290° bursts reported.

(West Limb)
31 1306-1343 NO9W32 sn 15494 00010 1 IL(M) 5 IIIG,V(M) «
Sept 1 0945-1027 $35E55 In 15509 11010 3 TI(M) 5 I1Tg(DCM) .

2 2347-2447 —_$30E29 sb 15509 00030 3 IV(M);18,C and ILIN(M);
CGulgoora radioheliograph locates moving Type IV at 1.2 RO, No SID and No radio
P.A. 220°, beyond sW limb. bursts reported.

4 (0800-0819 S32E14 lf 15509 01232 8 IE and IV(M) ;ILIg(DCM,M)
and 10 CM Flux = 140;II and
0812-0927 S15#52 2n 15521 22233 2 IV common to both flares.

4 NISWLO sn 15508 00032 5 Iv(M); LIIN(M,DKM) .

7 ‘S28W17 In 15518 11132 8 TL(M); IV(DCM,M,DKM) .

8 (0451) 00011 2 IL(M);IIIb(M);No flare
or SID reported.

17 0826-0917 —-N35E27 In 15543 31100 5 No DYN. SP. events re-

~ ported.

17 1459-1615 N36E23 2n 15543 32100 6 No DYN. SP. events re-
ported.

18 0927-0932 $28E19 sb 15541 10133 8 TI(M);IV(DCM) ,8 minutes
duration; IT1G(DCM,M) .

21 0416-0508 —_N23E40 1b 15546 11231 8 10 CM Flux = 450;I11(M);
‘Iv(DCM,M,DKM); IIIb, V(M,
DKM) «

22 (1345-1500 N28E48 en 15551 00032 5 TIM) ; IV(DOM) ; LLTG(M,DKM)

and II and IV common to both
1430-1535 S24W11 sf 15542 00030 3 flares.

23 N35W50 3b 15543 23233 13 10 CM Flux = 375;111G
(DCM) 5 LI(M) 5 IV(DCM,M) «

24 N25WO7 1b 15546 122 7 10 CM Flux = 163; 11(M,
DKM);1V(M),4 minutes
duration.

24 S20W43 sb 15542 10131 6 IL(M); IV(DCM,M).

27 $18W80 lf 15542 11132 8 LCM); 1V(DKM) «

27 NLOWL6 In 15551 11131 7 IV(DCM) ; ITTG(DCM,TM) «

27 N27W19 2b 15551 22233 12 10 GM Flux = 406;1V
(DCM, M) 5 IT Ig,,V(M) ; Strong,
radio bursts at all wave-
lengths.

29 1046-1244 © $3155 In 15564 11012 5 TI(M) 5 TITB(M) «

Oct 1 0653-0851  $13E57 2n 15570 32233 1B 10 OM Flux = 2643 11(M);
‘IV(DCM,M);IN(DCM);A great
“radio flare” at DCM and
M wavelengths.

3 0755-0835 $1758 In 15556 11011 4 IL(M).

4 “Te09-1611 —s09#07 af 15570 00011 2 IL(M) 5 ILIG ,V(DCM,M,DKM) 5
Flare association ques~
tionable.

5 (0144) 00031 4 IV(M) ; TITg(M,DKM); No
Culgoora radioheliograph places source of moving Type IV at Flare or SID reported.
1.0 to 1.5 RO, P.A, 110° (Possibly region 15587 on invisible
hemisphere, beyond S& limb?)

5 (0633) 00113 5 11(M); ILIG, V(DCM,M,DKM) ;

No suitable prior flare.

5 1335-1458 S16E04 sf 15570 10233 9 10 CM Flux = 105;1v(DcM,
M);IN(M).

6 1646-1724 — S15E77 eb 15587 10111 4 IL(M) 5 IEIG ,V(DCM,M,DKM) «

7 10s 00010 1 IL(M);Fast drift (DCM);
Culgoora radioheliograph places source at 1.2 RO, P.A. 115° No flare, SID or radio
(Active region 15587 at SE limb) bursts reported.

8 0835-0854 — S16H63 en 15587 10113 6 TL(M) 5 ITTg,V(M, DRM) »

9 Cozy 10133 8 II and Iv(DCM,M);IIIg,

Culgoora radioheliograph places source at 1.0 RO, P.A. 125°
(Possibly from active region 15587?)

See notes to Table 1 on page 20.

13

V(DCM,M,DKM);No suitable
prior flare,



WORLD DATA CENTER A
for
Solar-Terrestrial Physics

t
|
|
I
|

REPORT UAG-80

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 |
|

Applied Physics Laboratory
Laurel, Maryland 20810 i

July 1981

Published by World Data Center A for
Solar-Terrestrial Physics, NOAA, Boulder, Colorado
and printed by

U.S. DEPARTMENT OF COMMERCE |
NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION
ENVIRONMENTAL DATA AND INFORMATION SERVICE
Boulder, Colorado, USA 80303

SUBSCRIPTION PRICE: $30.00 a year; $17.30 additional for foreign mailing; single copy price varies.*
Checks and money orders should be made payable to the Department of Commerce, NOAA/NGSDC.
Remittance and correspondence regarding subscriptions should be sent to the National Geophysical and
Solar—Terrestrial Data Center, NOAA, Boulder, CO 80303. |

*Price this issue $2.00


anes



DATE
1976
Mar 21

Apr 7

May 16
Aug 2

Sep 3

Nov 19

15
1977
Jan 2

12
13

Feb 28

Apr 13

APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)

TIME (UT) McMATH Ha FLARE COMP.

OF FLARE Wa PLAGE PROFILE FLARE

OR EVENT POSITION © IMP. NUMBER abede INDEX REMARKS

1306-1323 NO3W33 sn 14127 20122 7 CONT(M, DKM) ; IT g(M)

1829-1924 NO3W34 sb 14127 20101 4 IIZG(DCM,M,DKM)

2228-2255 NO3W37 sn 14127 10202 5 10 cm. Flux = 104;

ILIG ,V(DCM,M,DKM)

0011-0043 NO2W66 In 14127 11201 5 10 cm flux = 105; IS
and ILIN in prog.

2310-2318 SO7E67 sf 14143 00020 2 CONT(M, DKM) ; LIT g (M4)

S04E61 sf 14143 00022 4 CONT( DKM) ; LIIG ,V(M, DKM)
S08E62 sn 14143 10121 5 CONT(M, DKM) ; ITIG,V(M,DKM)
Also IV(DKM),8 min. dura~
tion.
SO7ES1 sf 14143 00020 2 CONT(M,DKM);1(M) in prog.
S10E49 In 14143 21122 8 ‘CONT(DKM) ; ILIG ,V(DCM,¥)
SO5E48 sf 14143 00022 4 IS and CONT in prog.
(24, DM) ILIG(DCM,M,DKM)

1152-1232 $098.26 sf 14143 00020 2 CONT(DKM) ; ITT g(DCM,M)

(1723) 00020 2 CONT(M) 5 ITTb(DCM,M) 5
No flare reported.

(0555) 00021 3 IS and CONT(M);

No flare reported.

1444-1519 $03W65 sf 14203 00020 2 CONT(M, DKM) ; 18(M)

orig 00022 4 CONT(DCM,M) ; ITIG,V
(DCM,M) No flare re~
ported.

2232-2257 N1SE60 sf 14352 00022 4 CONT(DCM,M) 5 ITIG,V
(DCM, M, DKA)

(0500) 0021 3 IS & CONT(M)5 IIIG
(DCM,M,DKM);No flare
reported.

(0434) 00020 2 IS & CONT(M,DKYM);ITIg,
V(M,DKM); No flare re~
ported.

(1346) 00020 2 CONT(DKM) 5 11Tg(TM) 5
No flare reported.

9905-0930) N1L4B05 sb 14395 IN & CONT(DCM,M) 5 IIIG

‘and 10122 6 (eM, 4)

0917-0925) —w20W90 sf 14403

a NL6WO7 sf 14395 IN & CONT(DCM,M);

‘and 00021 3 TIIG(DCM,¥)

0730-0744) N22W90 sf 14403

NI5WO8 sn 14395 00021 3 CONT(M, DKM) ; IITg(DCM,M)
N20E82 dn 14429 11132 8 IV(M,DKM) ,4 min, duration
ILIG(M,DKM)

(0550) 00022 4  & CONT(DCM,M)

No flare reported.

0846-0913 S24E52 sf 14468 00020 2 I & CONT(DCM,M)

(0714) 00020 2 Is & CONT(M);

No flare reported.

(0621) 00020 2 I & CONT(DCM,TM);

No flare reported.

(1207) 00022 4 I & CONT(DCM,M);

No flare reported.

(0900) 00020 2 I & CONT(DCM,M); I1IG
(DeM,M) No flare re~
ported.

(<0727) 00020 2 I & CONT(DCM,M).

No flare reported.

(1200) 00020 2 IN and CONT(DCM,M);

No flare reported.

1316-1355 S28WOS on 14607 10020 3 IS & CONT(DCM,M)

7329-1342 s31W17 sf 14607 00020 2 IS & CONT(M)

(2053) 10020 3 CONT(DKM) ; IITg,U,V(M)
No flare reported.

2332-2359 S21E57 An 14726 21000 3 No Dyn. Spectrum event

22

reported.



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 seven Subcenters:

World Data Center A
Coordination Office
National Academy of Sciences
2101 Constitution Avenue, N.W.
Washington, D.C., U.S.A., 20418
[Telephone: (202) 389-6478]

Glaetology [Snow and Ice]: Rotation of the Earth:
World Data Center A: Glaciology World Data Center A: Rotation
[Snow and Ice] of the Earth
Inst. of Arctic & Alpine Research U.S. Naval Observatory
University of Colorado Washington, D.C., U.S.A. 20390
Boulder, Colorado, U.S.A. 80309 [Telephone: (202) 254-4023]

[Telephone: (303) 492-5171]
Solar-Terrestrial Physics (Solar and

Meteorology (and Nuclear Radiation) : Interplanetary Phenomena, Ionospheric
Phenomena, Flare-Associated Events,
World Data Center A: Meteorology Geomagnetic Variations, Magnetospheric
National Climatic Center and Interplanetary Magnetic Phenomena,
Federal Building Aurora, Cosmic Rays, Airglow):
Asheville, North Carolina, U.S.A. 28801
[Telephone: (704) 258-2850] World Data Center A
for Solar-Terrestrial Physics
Oceanography : Environmental Data and Information
Service, NOAA
World Data Center A: Oceanography Boulder, Colorado, U.S.A. 80303
National Oceanic and Atmospheric [Telephone: (303) 497-6323]
Administration
Washington, D.C., U.S.A. 20235 Solid-Earth Geophysics (Seismology,
[Telephone: (202) 634-7249] Tsunamis, Gravimetry, Earth Tides,
Recent Movements of the Earth's
Rockets and Satellites: Crust, Magnetic Measurements,
Paleomagnetism and Archeomagnetism,
World Data Center A: Rockets and Volcanology, Geothermics):
Satellites
Goddard Space Flight Center World Data Center A
Code 601 for Solid-Earth Geophysics
Greenbelt, Maryland, U.S.A. 20771 Environmental Data and Information
[Telephone: (301) 344-6695] Service, NOAA

Boulder, Colorado, U.S.A. . 80303
[Telephone: (303) 497-6522]

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.

if

i

E
ij



APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)

TIME (UT) McMATH Ha FLARE coMP .
OF FLARE Ha PLAGE PROFILE FLARE
DATE OR EVENT POSITION IMP. NUMBER abede INDEX REMARKS
1979
May 1 0351-0416 —NISEI8 In 15974 21002 5 1S(DCM).
1 31 = $2420 sf 15968 00022 4
$30E27 In 15978 01022 5 18,CONT(DCM,M) .
NL1E20 sf 15974 00022 4
1 N19W40 sf 15967 00200 2 10 cm flux > 160; IS,
DC in progres

6 2335-2353 N24E34 wb 15990 11200 4 10 cm flux = 100; IIIg,
V,U(DCM,M) «

17 (0116-0138 s22we69 sb 15996 20100 3 No Dyn. Sp. events re~

f S23W46 sf 16001 20100 3 ported; three flares in
N13E07 sf 16010 20000 2 common with SID.
st) NLOW75 en 15999 20100 3 No Dyn.Sp event reported.
20 832584 sf 16034 10021 4
| | CONT(M) 5 LLIN(M) «
1110-1137 NISW65 In 16014 11021 5
20 (i310) 20000 2 IIIg(M);No flare reported
21 (0443-0510 N20W50 le 16014
f and 21001 4 IITb,V(M,DKM) «
0458-0515 $2253 1b 16030
21 0626-0632 «S17 a8 en 16005, 20000 2 IZING).
22 1110-1235 S21E35 2n 16030 12100 4 No Dyn.Sp. event reported
Jun 1 1455-1530 NISE65. sn 16051 00020 2 TC(M); LLINCM).

2 N20E49 sb 16051 10220 5 10 cm flux = 122; TC(M);
ITIN(M,DKM) «

3 0129-0159 —-N14E50 2b 16051 02000 2 No SID or Dyn.Sp. events
reported.

3 (0845-1113 N18E39 2n 16051 22100 5 No Dyn.Sp. events

and reported; Simultaneous
0910-1119 $2647 wb 16052 21100 4 flares common to major
sID.

5 0124-0220 -N20E18 In 16051 21121 7 IS, C(M) ; ITIG(M,DKM) .

6 2105-2139 = NITE71 1b 16067 21201 6 10 cm flux = 204; TIIN(M)

10 (0220) 00020 2 I8,DC,CONT(DCM,M); No
prior flare reported.

10 (1424) 00020 2 CONT(M); No prior flare
reported.

dL (1150) 10122 6 CONT(M); IS(M); No flare
reported.

11 (1223-1243 -N20W75, 1b 16051 21122 8

| and } I and CONT(M).
1229-1243 $25W52 sf 16052 20122 7

ul T5207 00020 2 IC(M);ITIb(M); No prior
flare reported.

11 (1745-1818 825055 sn 16052 10020 3

f and \ I and CONT(M);IZIG(M).
1747-1809 N22W81 1b 16051 11020 4

lL DYT6-2125 —N28w75 sf 16051 00020 2 IS ,C(DCM,M) ; ITTS(M) .

12 0548-0555 N14E03 sn 16067 00020 2 IS and CONT(M).

2 S25W65 sn 16052 00200 2 10 cm flux = 228; No SID
and no Dyn.Sp. events re-
ported.

12 S18E05 sf 16065 IC(M); No SID or single

\ 00020 2 freq. radio events re~
1452-1549 $23W66 sf 16052 ported.

12 1649-1658 —_N20W90 sf 16051 00020 2 IC(M)5ITIG(M).

12 N19W89 sn 16051 00020 2 18,DC, and CONT(DCM,M);No
SID or single freq. radio
events reported.

13 N16E90 sf 16092 00120 3 CONT(M) ~ Possibly an
“ALL Day" report.

13 NISE87 sb 16092 00022 4 IS ,DC,CONT(DCM,M) ; LTIS(M)

N23E20 en 16070
14 | 00020 2 18,DC,CONT(M); IZIS(M)
0125-0143 S25w13 of 16065

14 ZiL0-2215 NS W468 sn 16067 00020 2 18 ,C(DCM,M);IIIS(M) .

30 0551-0638 S28E78 lf 16112 01020 3 I8,DC,CONT(M) ; IIIg(M).

30 1835-1844 = N1BE45 sb 16117 00020 2 IC(M);No SID or single
freq. radio events re-
ported.

Jul 1 0259-0420 $2763 2n 16112 02000 2 ILIg(M) 5; 18,DC(M) «

2 “Caasy 00120 3 CONT(M); No flare or SID
reported.

3 2300-2337 NO4W02 2n 16111 12000 3 ILIg(DCM) ;18(M).

4 ‘Q601-0647 = —-NoBE47 1b 16122 11200 4 IV and IS, CONT in prog;
10 cm flux = 170.

4 0829-0947 NOBE46 1b 16122 11122 7 CONT(M);IS in prog.

30



23
23

24
26

27
28

28

May 2

Re

APPENDIX OF "LESSER EVENTS" FOR 1975-1979 (continued)

TIME (UT) McMATH = Ha FLARE COMP.

OF FLARE Ha PLAGE PROFILE FLARE

OR EVENT © POSITION IMP, NUMBER abede INDEX REMARKS

(1415) 00022 4 CONT(M) ; ILIG(DCM,M)

No flare reported.

(1430) 00021 3 ILIg AND CONT(H);No
flare reported.

1840-1844 $35E90 sf 15178 10202 5 10 CM FLUX = 440; 111G

— (DCM,M);Strong radio
bursts at all wavelengths

1150-1158 $30B85 sf 15178 IIIb AND CONT(M); With

T55-1215 N17 WO2 sn 15175 10020 3 simultaneous flares.
$34E77 2n 15178 12000 3 No radio events except
M-) noise storm.
26145 an 15172 00021 3 CONT(M) 5 LTIN(M,DKM)

151-0207 $3569 sm 15178 00021 3 IS,C(M);No radio bursts
reported.

(0450) 00021 3 Is,C(M) ;1N,DC(DCM)

No flare reported.

1235-1315 N18E67 1b 15184 11020 4 IIIS AND CONT(H)

2329-2445  $29H02 an 15178 00022 4 IS,C(DCM,M) ; IITb,U(M)

0211-0248 — S26E08 sn 15178 00122 5 IS,C,DC(DCM,M)

(o24dy 00020 2 IS,C,DC(DCM,M) ; IIIg ,U(M);
No flare or radio bursts
reported.

(2355) 00022 4 IS,C,DC(DCM,M) ; ITg,U(M) ;

Culgoora radioheliograph places source of IS,C at, No flare reported.

0.3 RO, P.A. 120°-170° (Probably active region 15178)

(1209) 20001 3 ILIg(M);No flare reported

(x2035) 00120 3 I8,C(M);No flare reported

0835-0855 NIOW11 sb 15221 20103 6 ILIG ,V(DCM,M,DKM)

N23W71 In 15214 11123 8 Is ,C(DCM) ; IG v(m)

N18W25, In 15221 11123 8 CONT(M) 5; IIIG ,V(DCM,M) 5
Strong radio bursts at
DCM and M wavelengths.

(1210) 2-002 24 ILIg(M);No flare patrol
1211-1250 ur.

(1457) 1-022 25 IIIb and CONT(M);No flare
patrol 1415-1441 UT.

(1159) 20121 6 CONT(M);No flare reported

0644-0730 N20W65 an 15221 22101 6 IIIb and IITg,U(M)

0740-0746 NI9ESO sf 15235 20102 5 ILTg,V(DCH,M,DKM)

(0450-0512  N20W86 1b 15221 21102 6 ILIG ,V,U(M)

1059-1117 NISEO5 en 15235 10121 5 CONT(M) ; III, ¥(DCM,M)

26590 en 15221 20100 3

N20W18 sf 15239 10021 4 CONT(M);IN AND ITIN (1M)

N12WO7 sf 15235 Simultaneous flares.

N14WO7 sb 15235 20104 7 IIIG(DCM,M); Strong radio
bursts at DCM and M wave-
lengths.

(1348) 10031 5 Iy(M),7 min, duration;
ILIG(M,DKM);No flare re~
ported.

(1025) 20100 3 IIIg(M);No flare reported

(745) 20100 3 ITIG,V(M,DKM);No flare
reported.

0540-0550 N15W90 sn 15254 20000 2 ILIN(M);No radio bursts
reported.

1339-1410 N20B39 In 15266 11120 5 CONT(M);Weak radio bursts
only at MM and CM wave~
lengths.

0945-1006 N22E65 1b 15266 21102 6 IITG,V(DCM,M)

0010-0041 N27E45 sb 15266 10232 8 IV(DCM,M),7 min, duration
ILIG,V,U(DCM,M);10 CM
Flux = 295.

0438-0500 N24W69 sn 15248 00020 2 I8,C(M);No radio events

— except M+) noise storms.

1330-1355 N25WOS en 15266 00020 2 CONT(M);No radio bursts
reported,

(0403) 10020 3 IS ,C(M); ITIG,N(M);No
flare and no radio bursts
reported.

1500-1655 N21W33 en 15266 00020 2 1C(M) ; IL1g(M,DKM) ;No

— radio bursts reported.

1654-1735 N29W31 Ib 15266 11233 10 10 CM FLUX = 170;IV(M),

6 Min. duration; IIIG,V
(DCM,M,DKM) .
2020-2056 N26W20 sb 15266 10120 4 Is,C,DC(M)
(0637-0708 © N21W24 In 15266 11020 4 conr(M)

25



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES"

1975-1979 (continued)

‘TIME (UT) McMATH Ha FLARE ‘COMP.
OF FLARE Ha PLAGE PROFILE FLARE
DATE OR_EVENT POSITION IMP. NUMBER abcde INDEX REMARKS"
1978
Feb 7 1842-1937 N14ES4 sb 15139 00222 6 GB,10 OM Flux = 620; CONT
Ba (i) ;1V Pulsations (DCH)
8 1906-1910 -N15E38 sb 15139 10130 5 ‘IV(DGH) ; IT1G(M, KM)
9 TI51-1206 = N13E33 2b 15139 12213 9 IL(M);111g(DCM,)
9 Ter3-1620 = Niewil sf 15135 20114 8 IL(DCM,M):Flare asso-
ciation doubtful.
10 (2113) 1-132 27 IV(DCM,M) ; II(M,DKM)IIIG,

Culgoora radioheliograph places source (at 2300 UT) at
1.4 RO, P.A. 320° (Possibly active region 15135 on disk,

‘or region 15126 just beyond west limb),

13° 0115-0400 N15W20
15 2159-2259 N15W52
16 2225-2238 N1SW61

229-2304  N27W33

2n

sb

sf
sn

15139

15139

15139
15155

32232
10130

00131

Culgoora radio heliograph places source’of IV (at 2259 UT)

at 0.8 RO, P.A, 290° (probably region 15139).

17 0244-0325 NL6WO5
18 (1645)
24 0101-0105 N20E03,
25 0302-0331 = NL9WI1
25 0811-0827 N21W16
25 1449-1512 NIOW21
26 0649-0706 N21W32
27 (0804)

Mar 6 1125-1418 —_N26E20
14 0339-0357 827829
28 0030-0052 NISWI5
28 “(1616)

Apr 2 (1108)
3 (0542)
6 (1904)
7 (2023)
8 0109-0445 NIOWLL
8 0422-0452 NLGWO8
8 1050-1058 = N23W14
9 (2054)
10 (0222)

Culgoora radioheliograph places source at 1.2 RO, P-A. 30°
(Probably active region 15235 at NE limb.)

10 0244-0352 NI6E18.
10 TIOS-1T10—N20B75
AL 1334-1731 N22W56
11 } 2120-2132 NI8ES7

828038
4 N18E28
15 NL4WO8
16 0919-0931 = N14W22
16 2317-2326 = $1929

See notes to Table 1 on page 20.

2b

2b

sn

sf

sf
1b

2b

sb
sf
in
sb

sf

15139

15161
15161
15161
15161

15161
15172

15178
15198

15221

15221

15221

15231
15235

15221

15235
15227
15235
15235
15235

15240

12012
00010

00010
11113,
11113
21233

10010
00010

22121
10112
00010
00010
00010

00011
10113
1-225

32232

10130

10133

00013

10012

10011

31223

32332

10112

01131
20133
20112

00010

V(DCM,M,DKM);No flare
patrol, 2018-2250 ur.

12 ‘IV(M);II(M,DKM) ;GB,
10 CM Flux = 737.

5 IL and IV(M,DKM);IIIG
(DCM,M,DKM) «

5 IL and IV in Prog at 2259
ur (Clg. Rad.);1IIg(DcM,
M,DKM) «

IL(M) ; LLIG(DCM,M,DKM)
TI(M,DKM);No flare
reported
IL(M) 3 LLIG(DCM,M)
TI(M); 111g ,U(DCM,M)
TL(DCM,M) ; ILIG(DCM,M)

IL & IV(DCM,M);TIIG,U,DC
(DeM,M) 510 CM Flux = 144,
ILM)

II(M);No flare reported.

Dusk no

IL & CONT(M);ITTg(M).
IL(M) ; ILIG,V,U(DCM,M,DKM)
IlIg and TI(M).

II(M) and IT(M,DKM) 5 IIIg
(M);No flare reported.

eres

1 ILQQ;No flare or SID or
radio bursts reported.

2 II(M);No flare reported.

6 IL(M) 5 ITIG(DCM,M) ;No
flare reported.

> 10 II(M) 5 LIIG ,V(DCM,M,DKM) 5
No flare patrol 2005-2130
ur.

12 GB,10 CM Flux = 750511
Qt) ;1V(DeM,M);A great
“radio flare” at DCM and
M wavelengths.

5 IL and IV(M);IIIG(DCM,M,
DKM);May be a continua~
tion of previous major
event.

8 IV(M,DKM) ; IG, V(DCM,M) ;
Strong radio bursts at
DCM and M wavelengths.

4 LICH) But questionable;
IIIg(DCM,M,DKM);No flare
reported.
II(DCM,M) ; TTIG ,U(DCM,M,
DKM);No flare reported.

3 ‘IL(M) ,IIIG,V(DCM,M,DKM)

il I1(DCM,M) ; CONT(M) ; ILIG
(DCM,M);10 CM Flux = 199.

13 GB,10 GM FLUX = 2878; II

and IV (DCM,M)sIIIg(M)5A
great “radio flare”,es~
pecially at CM and DCH
wavelengths.

5 IL(M) ; 1ILg(DCM,M) 5 Simul~
taneous flares.

6 IT and IV(DCM,M);ITTg(M).

9 IV(M); ILIG,V(DCM,M) «

6 IL(DCM,M); ITIG,V,DC(DCM,
M,DKM).

1 TQ).



COMPREHENSIVE FLARE INDEX FOR "MAJOR FLARES"

1975-1979 (continued)

‘TIME (UT) McMATH Ha FLARE COMP.
OF FLARE Ha PLAGE PROFILE FLARE
pare or EVENT *t POSITION IMP. NUMBER abede INDEX REMARKS"
1978
Jun 28 (2352) 00010 IL(M) 5 ILIG(DCM,M,DKM) 5
Culgoora radioheliograph places source at 0.5 RO, P.A. 40° No flare, SID, or radio
(on disk, NE quadrant, region ambiguous) bursts reported.
July 2 (1404) 20131 7 IW and CONT(M);IIIG,V
(4,DKM);No flare reported
3 (0614) 10031 5 IL and IV(M);IIIG,V(M) 5
No flare reported.

4 (2346) 00010 1 IL(M,DKM) ; IITg UCM) ;No
Culgoora radioheliograph places source at 1.2 RO, P.A. 280° flare, SID, or radio
(Perhaps region 15376 at W limb?) bursts reported.

5 1139-1308 827129 sb 15389 20112 6 TL(DCM,M);V()

5 827W33 sb 15389 10121 5 II and CONT(M)

6 S27W43 sn 15389 20133 9 IL(DCM,M);IV and CONT(M)

T1Ig ,V(DCM,M,DKM) «
7 0530-0540 —-NISE90 2n 15403 22132 10 LL(DCM,¢M) ; IV(M) 5 EIIG
(M4, DKM) «
7 (0946-1010 NI5E90 sn IV(M); LLIG,V(DCM,TM) ;
{ and | 15403 31132 10 Strong SID.
N18E90 In
8 NL6E82 In 15403 21232 10 10 CM Flux = 420;1V(poM,
‘M);UNCL V(M).
9 (0703-0734 —NISE75 sn 15403 I(M) ; IITg ,V(DCM,M, DKM)
{ and \ 10212 6 10 CM Flux = 117. Simul-
070: S24W87 sn 15389 taneous flares in widely
separated regions.

9 N18E69 1b 15403 1112 6 TEM) 5 LTIG(DCM,M) «

9 N19E70 1b 15403 21132 9 IX and IV(M);1ILg(DCM,M)«

9 NI9E68 2b 15403 22232 ot 10 CM Flux = 450; 1V(DoM,

‘M,DKM); ILLG ,V(M,DKM) 5
Strong radio bursts at
all frequencies, espec~
dally at MM wavelengths.

10 0137-0258 —_N16E64 ib 15403 31000 4 No DYN. SP. event.

10 0502-0543 = NI8E64 in 15403 W112 6 IL(M) 5 IILG,V(DCM,M) «

10 (ee NI8E61 3b 15403 33333 15 -GB,10 CM Flux = 1275

and
0613-0635 N22W37 af 15409 30233 u 10 CM Flux = 560;TI(M,
DKM) ; 1V(DCM,M) ; LIIG,V(M);
A great “radio flare”.

10 1655-1806 NI7ES4 2b 15403 22114 10 LLM) 5 ILIG ,V(DCM,M, DRM) ;

a Strong radio bursts at
DCH and M wavelengths.
AL 0122-0134 NISE47 sn 15403 20113 7 T1(M) ; LLLG(DCM,M,DKM) «
11 (0304-0345 © NLSE49 In II(M)3 ITIG ,V(DCM,M, DRM) 5
| and 15403 12013 7 Strong radio bursts’ at
0353-0415 NI7E51 2b DCM and M wavelengths.
11 0426-0447 —-NL2E81 in 15410 21333 2 GB, 10 CM Flux = 1338;
IL(DCM,M,DKM) ; 1V(DCM,M)
T1Ig(M,DKM)

u NISESS 2b 15403 32334 15 GB, 10 CM Flux = 2800;
IL(M) , LV(DCM,M) 5 ITIg(M) 5
A great “radio flare”
with great bursts at all
frequencies.

11 1613-1644 NI6E39 sn 15403 10233 9 10 CM Flux = 110;1V(M);

IIIG ,V(DCM,M,DKM) «

14 1733-1737 NI7WOL en 15403 00113 5 II(M,DKM) ; ILIG ,V(DCM,
—_— M,DKM).«

15 (0404-0423  N1BWOS en 15403 10110 3 LI(M) 0350-0435 UT; IIIG
? { and ? (DCM,M,DKM); Flare asso-
407-0418 $2344 sn 15413 10010 2 ctation doubtful.

‘But Culgoora radioheliograph places source of Type II burst at
East Limb (1.0 RO, P.A. 90°).

16 (0315) 00010 1 IL(M);IIIN(M) ;No flare
Culgoora radioheliograph places source of II at 1.3 RO, or SID or radio bursts
P.A. 300° (Perhaps active region 15409 on invisible hem- reported.
isphere, about 2 days beyond W limb).

17 0022-0035 $2520 sn 15413 00030 3 IL & IV(M);IIIG(M).

17 0901-0958 = s19W65 In 15397 11010 3 I1(M).

18 ‘0018-0100 N21 WA In 15403 11300 5 GB, 10 CM Flux = 1000;

See notes to Table 1 on page 20.

12

IEIN(M).