COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ho, McMath Ho Flare Comp, 1-84
Date of Flare Position Imp, Plage Profile Flare Max.X-ray Some remarks
or Event t+ —— Number abcde _ Index Flux (t) (r)
1974 I
Oct. 5 1508-1547 S20E44 sn 13278 if
giand7or 00030 3 |
1510-1525 NO8E90 sn 13280, |
8 gi550-1610 NO7E47 sf 13280 00010 1 |
11 0325-0401 N12E02 In 13280 21232 10** CLG Radioheliograph

observes II and IV,

source location in |

NE Quadrant. |
11 1010-1050 N12WO3 1b 13280 21112 7? IV (DCM-DURN) also

reported, but dura-

tion is only 1 minute.

il 1425-1548 N12W03 1b 13280 21232 10 IV (M-WEIS), duration
10 minutes.
12 1130-1215 N11WOS In 13280 21232 10
25 1716 - - : 00020 ax*
31 1539-1553 N16E90 sn 13324 30131 Be
Nov. 5 1529-1550 S12W78 sn 13310 21233 11** With Two Type II's.
6 0309-0342 S13W85 Ib 13310 21231 gue CLG Radioheliograph

locates source of IT
and IV. 1 to 2 Ro
beyond W. Limb.

6 1345-1442 NISE13 1b 13324 11111 5? Also IV (DCM & M-DURN),
duration 7 minutes.
7 1500-1520 N10WO6 sf}
ggand \ 13324 00030 3
1523-1556 N14W02 sn.
30 0551-0614 NO3W52 sn 13343 00010 1
Dec. 7 (1950) : - - 00010 1
22 1601-1810 NO6E14 In 13383 01131 oe
25 906-2030 NOSW26 1b 13383 11131 7
27 1017-0059 NO7W43 In 13383 01110 3

16



COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ha  McMath © Ha Flare Comp. 1-84
Date of Flare Position Imp, Plage Profile Flare  Max.X-ray Some remarks
or Eventtt — Number abcde Index Flux (t) (r

1972

Aug. 12 (2042) - - - 00030 3? 0.007 IV (M & DKM-BO) is
reported as Is and
cont. at M-A by CLG.

15 1739-1812 NO3E77 sb 11994 10110 3 0.021

21 1927-1936 S12E60 sf 12002 00010 1 vs

24 0345-0445 S04E02 2n 12001

fate 02012 5 0.005
0347-0422 S15E32 sn 12002

24 1700 - - - 00030 3 s IV (DKM-BO), duration
11 minutes.

26 (0348) - - - 00132 6** 0.008

26 —g2300-2340 N16E89 sn 12011 00132 6** 0.010

27° 92334-2340 N14E88 sn 12011 20231 Bee 0.020

28 1e0 0-16: a S24E89 sn 12014 10010 2 0.020

28 N14E60 sn 12011 00033 6 -

30 S26E59 In 12014 1111- 24 0.020

31 S26E37 In 12014 01010 2 s Also cont. (DKM-BO)
reported in progress
all day.

Sep. 5 1422-1600 $25W21 In 12014(S) 01012 4 s Region has become
"Spotless" by day
of Flare.

5 1536-1636 N17W19 In 12011 01010 2 0.004

6 0407-0440 SO7W87 1b 12012 21131 Exe -

6 2149-2154 S08W29 sn 12016 10132 Tee -

10 = g1237-1252 N11W62 st 12023 00030 3? - IV_(M & DKM-BO),
called Ic(M) by H,
and cont. (DKM) by SAG.

10 (1745) . - - 00010 1 s

21 2241-2345 S17E13 In 12040 01010 2 0.004

Oct. 1 0433-0458 NI1E25 sb 12056 20112 6 0.081

1 1645-1711 N12E16 sn 12056 20111 5 0.081

7 2225-2340 N19W25 an 12057 02031 6? s IV_(M & DKM-BO),
called Is and cont.
(M) by CL@.

10 (2141) - - - 00010 1 vs

21. 1537-1556 S12E90 1b 12090 01010 2 0.003

27 1957-2014 S11E22 sn 12094 00030 3? od IV_(M & DKM-BO),
called Is and cont.
(M & DKM) by H&CLG.

28 1752-1911 SO9E67 In 12099(s) 01020 ae 0.005 A "Spotless" Flare.

29 = giS44-2020 S10E05 sn? 12094 20230 7? 0.033 TV_(M & DKM-BO),
called I and cont.
(M & DKM) by H and SAG.

Nov. 1 (0714) - - - 00013 4 0.013

24 1234-1320 S07W33 sn 12115 20130 6 0.016

25 0817-0912 SO6W44 1b 12115 21233 11** 0.049

28 0358-0428 S08W81 in 12115 01130 5e* 0.011

Dec. 5  g0602-0606 S14W19 sn 12132 00010 1 x

8 2257-2345 N10E38 In 12136 21233 11** = ->0.029

9 T601)* - - - 2-210 5? 0.014 Also IV (DCM & M-H),
duration 8 minutes,

10 0033-02 No Flare Patrol.

0200 NI1E25 In 12136 21131 8 0.0,

15 0522-0645 SO6E47 1b 12143 21110 5 0.029

16 0341-0445 N12W57 1b 12136 21232 10** 0.101

30 2240 - - - 00030 3 x IV (M), From CLG

10

Radioheliograph, with
source position beyond
East Limb.



Peak X-Ray Flux for "Major" Flares

The availability of X-ray data for flares in the years 1970-74 suggests that this aspect of flare
emission be compared with the Comprehensive Flare Index for "major" flares during the years in ques-
tion. Figure 2A shows a comparison of the comprehensive indices and the peak X-ray flux for these
flares. As is to be expected, there is a general proportionality between the two values, but the
scatter is great. High values of X-ray maximum do not guarantee high values of the index with its
partial dependence on radio frequency flux. For flares with indices of 6, the X-ray emission ranged
all the way from "no detectable event" to the highest values measured.

COMPARISON OF X-RAY FLUX WITH CFI AND SID VALUES

X-RAY FLUX X-RAY FLUX
1.00 1.006
eae . ‘ i
E >
E . . e
100 aren ’
E peig "00 +
F ate .
PRG :
ed a_i Fo r
Ole ae . o1ok
001 00Ir
SMALL feta BDbasten sare oe : SMALL
VERY VERY
SMALL Atte ie oe oe +e SMALL
NO _ bi tt, No
evEnTPR in sm leh] a
2 4 6 8 10 12 214 0 i} 2 3
CFI , SID IMPORTANCE
Fig. 2A. Comparison of the Comprehensive Fig. 2B. Comparison of Sudden Iono-
. Flare Index (CFI) with the peak spheric Disturbances (SIDs)
x-ray flux for the "major" flares with the peak x-ray flux for
of 1970-74. the "major" flares of 1970-74

In the derivation of the index, the importance of the SID has been used as a supposed measure
of the ionizing or X-radiation of the flare. Figure 2B shows the extent of the proportionality
between these two quantities for "major" flares in 1970-74. With a few marked exceptions, and with
a wide scatter, the two values increase together. It should be remembered that the X-ray measure
is the value of the peak flux without regard for the duration of the event, On the other hand, the
importance of the SID is influenced by duration. This difference probably contributes to the large
range in X-ray flux values associated with the respective evaluations of the SID. In spite of the
scatter of the points, Figure 2B suggests that future derivations of the comprehensive index could
replace the SID importance by a number reflecting the characteristic of the logarithm of the peak
X-ray flux, without a serious break in the homogeneity of the indices.

Acknowledgments

The authors acknowledge with gratitude support from NOAA Contract No, 03-4-022-94 and NASA
Grant NGL-23-005-275 during the years in which the work for this study was carried out.

20



EXPERIMENTAL COMPREHENSIVE SOLAR FLARE INDICES FOR CERTAIN FLARES, 1970-1974
compiled by

Helen W. Dodson and E. Ruth Hedeman
McMath-Hulbert Observatory, The University of Michigan
895 Lake Angelus Road North
Pontiac, Michigan 48055 U.S.A,

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. The experimental
and exploratory nature of the index was emphasized. The index apparently proved to be a useful
tool for some investigators and values of the indices for subsequent years have been requested.
Accordingly, the present report has been prepared.

We continue to emphasize the experimental nature of the index and report that the possible
form of an improved comprehensive index has been discussed with colleagues. The imperfections of
the present index are fully recognized, but a practical format for an improved type of comprehen-
sive flare evaluation has not yet been developed. Under these circumstances, and in the interests
of homogeneity, we have derived for the years 1970-74 comprehensive indices for so-called "major"
flares following the same definitions and rules that were used in the preparation of the indices
for 1955-1969,

The five components that comprise the "profile" of the flare are listed below. The sum of the
five components gives the Comprehensive Flare Index (CFI).

1. Importance of ionizing radiation as indicated by time-associated Short Wave Fade or
Sudden Ionospheric Disturbance; (Scale 1-3).

2. Importance of Ha flare; (Scale 1-3).

3. Magnitude of ~10 cm. flux; (Characteristic of log of flux in units of 10°??Wm-2Hz~?),
4, Dynamic spectrum; (Type II = 1, Continuum = 2, Type IV with duration >10 minutes = 3).
5. Magnitude of 200 MHz flux; (Characteristic of log of flux in units of 10-22Wm-? Hz-2).

Comprehensive Flare Indices for "Major" Flares

In Report UAG-14, and again in this report, values of the Comprehensive Flare Index have been
derived for a group of 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
1970-74 that satisfied any one of the following criteria:

Short wave fade (or Sudden Ionospheric Disturbance) importance 23.
Ho Flare, importance 23.

0 > 2500 x 10-?*Wm7?Hz-?,

Type IT 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 I. In this
table, the reported time refers to the Ha flare or subflare, when known. When no Ho 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 distinction has been made between "no flare
reported" and "Ha observations not in progress." An asterisk in the Time column of Table I identi-
fies the latter situation. Underlined times indicate exact beainning and/or end times.

In order to take care of some of the inadequacies of the index, a few additions have been in-
troduced in the tabulated data. A double asterisk now indicates the occurrence of a Type II burst
with flares for which this fact is masked in the fourth entry in the profile by the occurrence of
either continuum or Type IV emission. Columns giving information on the associated X-radiation
(1-8A), when known, and certain general remarks also have been added. °

For conventions of abbreviations see Solar-Geophysical Data, (SGD), especially SGD, 366 (Supple-
ment), Explanation of Data Reports, February 1975, U.S. Department of Commerce, (Boulder, Colorado
80302 U.S.A.). See also on p. 17 the Notes to both Table I and Appendix Table of "Lesser Events."

1



Notes: + This list of "major" flares includes all flares that satisfied any one of the
five criteria stated on page 1 of this report

abcde 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 v200 MHz flux. See page 1 of this report
A dash (-) appearing in the profile set indicates "no observations" were available
for that respective entry.

tt When no flare or subflare was reported the beginning time of the SID or radio fre-
quency event is shown in parentheses,

g Flare data were taken from Solar-Geophystcal Data instead of the "IAU Quarterly
Bulletin on Solar Activity" as in all other cases.

* Ha flare patrol was not in progress,

Ss This letter appearing after the McMath plage number indicates a "Spotless" flare
took place.

* A double asterisk following the index value indicates that a Type II burst, in
addition to continuum or Type IV emission, also was reported

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

t In general this column contains information on 1-84 flux compiled from assorted
data published in Solar-Geophysical Data (SGD) for the Naval Research Laboratory
(NRL) SOLRAD X-ray data. It is expressed in units of ergs cm-*sec-1. If the
flux value is enclosed in parentheses it indicates 2-12A data (Van Allen) have
been used. In this column the following conventions have been used from a sub-
jective examination of the graphs of the 1-8A X-ray records:
Ss = small, vs = very small, x = no event, - = no data.

r In the remarks column the following abbreviations have been used:

DCM, M, DKM = decimetric, metric, and dekametric events in the dynamic spectrums
BO (Boulder) , CLG (Culgoora), CLRO (Clark Lake Radio Observatory), DURN (Diirnten) ,
DWIN (Dwingeloo) , H (Ft. Davis), SAG (Sagamore Hill), WEIS (Weissenau) = stations
reporting dynamic spectrum events.

Comments on the Data Included in the List of "Major" Flares

. _ Table I above provides information about the "major" flares in the second five years of solar
cycle 20. Similar data for the first five years of the cycle can be found in Report UAG-14. It
should be realized that changes over the years in observational range and sensitivity, as well as
reporting techniques, have influenced to some extent the identification of an event as a "major"
flare and the value of the derived comprehensive index. In the years 1970-74 increased reports of
Type II and Type IV radio frequency emission with either subflares or at time of no known Ha flare
have snenyased markedly the proportions of so-called "major" flares with indices of 1 to 3 (See
Figure 1A).

In solar cycle 20 there were 100 flares with comprehensive indices >10, (41 in 1967-69 and
59 in 1970-74) and these flares with significant radiation generally throughout the electromagnetic
spectrum comprised approximately 10% of the list of "major" flares.

The completeness or homogeneity of the data in Table I can be evaluated in part from the dis-
tribution of the "major" flares versus Universal Time (UT). (See Figure 1A). For both five-year
intervals there tends to be a maximum in the second half of the Universal Day. This tendency is
not marked for flares with indices >10 but increases as the indices become smaller.

The relationship between Ha flare importance and comprehensive flare index for "major" flares,
1970-74, is shown in Table II. It can be noted that only 37, or 56%, of the "major" flares with
Ho importance 22 had comprehensive indices =10. It also seems of interest that more than half of
the flare-events here identified as "major" corresponded in time to either subflares or to no known
Ho flare. These results support current efforts of the World Data Centers and of the Solar Commis-
sion of the IAU to improve the world-wide reporting and tabulation of Ha events considered to be
subflares.

The distribution of Comprehensive Indices for each year in the interval 1970-74 is shown in
Table III. The small number of "major" flares in 1971 should be noted.

17



APPENDIX OF "LESSER EVENTS" (continued)

Time (UT) Ha  McMath © Ha Flare Comp, © 1-8A
Date of Flare Position Imp, Plage Profile Flare Peak Remarks
5 or Event tt Number abcde Index = Flux r)
197T .
May 5 1211-1250 N13E17 1b 11294 21100 4 0.069
20 0604-0745 No4w40 2n 11313 12100 4 0.021
dun. 29 1426-1442 N11W62 sf 11383
or 00032 5? - IV (M+H), duration
1427-1439 NO7E30 sf 11401 5 minutes.
dul. 1 0125-0155 S12E29 2b 11402 22000 4 0.190
17 0903-0953 NOSE15 1b 11425 21102 6 0.031
24 1023-1130 N14W44 In 11433 21100 4 0.071
Aug. 4 0148-0228 S08E70 2n 11457 021-0 23 0.002
24 (1003-2327) - - - 00030 3? IV (DKM-SAG) in prog-
ress all day. Mostly
called continuum by
other observers at
M & DKM-A. Not flare-
associated except for
continual smal] bright
points in region 11482
30 03-0410 S12W87 af 02,000 2 {at s1si15).
OF12-0523 $1485 inj 1482 pti00 i| 9.049
Nov. 9 (2350)* - - - 20000 2 0.040 No Flare Patrol,
1972
dan. 22 1433-1525 S14W27 1b 11693 21200 5 0.040
Feb, 8 (0914) - - - 001-1 22 0.093
14 -g1752-1832 N26E31 sn 11741 00030 3? - V (DCM-H) of short
duration, only 7
minutes.
16 1344-1408 NO9E85 sn 11748 20000 2 0.040
22 315-0346 NO8E04 1b 11748 21100 4 0.093
22 1413-1455 NO7WO5S sb 11748 20200 4? 0.017) Large 10 cm. burst
(PENN.-Flux = 610)
not confirmed by OTT,
BERL, ARC OR SAG.
Perhaps an error?
22 1825-1937 NO8WOS sn 11748 20100 3 0.058
26 1917-2015 S16W19 1b 11751 21200 5 0.040
Mar. 2 1812-1828 SO6E76 1b 11769 21200 5 0.044
5 1221-1308 SO7E40 In 11769 21102 6 0.053
7 ~~ (1330-2500) - - - 00030 3? IV (DKM-BO) in prog-
ress all day. Called
continuum (DKM) by SAG.,
and Ic (M & DKM) by
H. Probably related
to region 11769, CMP
Mar. 8.
8  g0404-0410 $12E07 sn 11769 10232 8? 0.013 Iv (DCM & M - CLG),
BO only 4 minutes
duration.
8 (1330-2452) - - - 00030 3? IV (M & DKM-BO) in
progress all day.
Called continuum (DKM)
by SAG, and I (M) by H.
18 S19E32 sn 11784 10030 4? 0.005 IV (DCM-H), duration
only 6 minutes.
22 S10W57 2n 11781(S) 02000 2 0.009 A "Spotless" Flare.
23

|
|
|
|
|
}



Table IT

Ho Importance of Flares in List of "Major" Flares 1970-1974

Value of Comprehensive Index
Inpor'tance 1-3 4-6 7-9 10-12 13-15 >15 Total
Number of Flares
3 0 1 0 1 2 1 5
2 3 9 16 18 15 0 61
1 25 52 60 40 5 0 182
Ss 86 82 33 3 0 204
? 71 23 4 0 0 0 98
Total 185 167 113 62 22 1 550
Percent of Flares
3 0 1 0 2 9 100 1
2 2 5 14 29 68 0 ll,
1 14 31 53 64 23 0 33
Ss 46 49 29 5 0 0 37
2 3814 4 0 0 0 18
Total 100 100 100 100 100 100 100

Table III

Number of "Major" Flares Distributed by Value of Comprehensive Flare Index, 1970-1974

Comprehensive Flare Index

Year 1 2 3 4 5 6 7 8 9.10 11 12 13 14 #15 #16 47 Total

1970 11 13° «18 «©23):«19) «18 «618 «611 «10S 10s 10 4 4 4 173
1971 9 4 16 10 7 5 5 5 5 4 2 1 1 74
1972 160615 #17 «ll 12 #14 8 9 4 5 6 1 3 1 1 1 124
1973 19 4 16 8 13 5 9 9 4 3 3 1 1 2 97
1974 7 4 16 6 6 10 6 6 4 4 3 5 1 4 82
Total 62 40 83 58 57 52 46 40 27 26 24 12 10 9 3 1 550

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 I has been provided. The appendix
follows the format and conventions of Table I and gives profiles and comprehensive indices for
the following categories of flares:

(1) All flares of Ha importance 2 not contained in the list of "major" flares

(2) All additional flares for which the (1-8A) peak flux was greater than
0.040 ergs cm-?sec-}.

(3) All flares for which Type IV emission was reported but for which the duration
was less than 10 minutes.

This compilation of Comprehensive Flare Indices for so-called "lesser" flares contains 203

entries, 40 of them for flares of Ha importance 2. The comprehensive indices range from 1 to 9 with

highest frequencies at values 3 to 5. There were only 3 cases of an index as great as 9 (see Fig-

ure 1B). Apparently the listing of "major" flares picks up practically all instances of flares
with comprehensive indices as great as 10.

19



Date

1974
Jan. 16
7

Feb, 15

20

Apr. 1

May 1

dun.

Or

19
23

30
30

dul. 1

i

wry

Pray

COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ha  McMath = Ha Flare Comp, 1-8A

of Flare Position Imp. Plage Profile Flare Max.-X-ray Some remarks

or Eventtt ~ __ Number abcde Index Flux (t) (r)

{636} - - - 00010 1 0.018
(1931 - - - 00010 1 vs

1505-1539 S12W51 sn 12749 10212 6? 0.018 Also IV (DCM) Reported
by DWIN, duration
4 minutes.

1513-1533 S18W30 sb 12752 20132 8? - IV (DKM-SAG), duration
3 minutes. Reported
as IIIG & V (DCM, M
& DKM) by H.

NOswW90 sn 12834 00030 3 -
S12W36 In 12848 31000 4 0.048
S13W55 1b 12849 31200 6
- - : 00010 1 -
asso. inde S07E90 sf 12906 00130 4 -
1002-1027 S11E75 2b 12906 22002 6 No NRL SOLRAD X-ray
, data in SGD Part IT
after April 1974.
(2330 - - 7 00030 3

2117-2328 S13W65 2n. 12906(S) 12211 7 Region 12906 is

— "Spotless" on day
of flare.

$1413 1b 12972(S) 21132 gee A "Spotless" Flare.
S15W46 1b 12972(S) 11112 6? Also IV (DKM-SAG),
duration 6 minutes.
Not reported by BO.
A "Spotless" Flare.
92200-2253 S12W08 sn 13002 00131 5e*

‘0508-0655 S15W50 3n 13002(S) 13110 6 Region 13002 is
"Spotless" on day of
flare. Also cont.
(DKM-MAN) , duration
8 minutes,

0226-0245 S11E49 sn 13043 10110 3

222. ~2310 S12E45 1b 13043 21222 gee Type II also observed
by CLG Radioheliograph.

2205-2252 $12E30 1b 13043 11232 9? IV (DKM-SAG), duration
14 minutes. Called
cont. (DKM) by MAN.

2334-2437 $15E27 sn 13043 10121 5% Two Flare Maxima, and
Three Type II's.

g0147-0156 S14E21 sf 13043 10010 2? Flare has ended before
II occurs. Cont. (DCM,
M, and DKM) in progress
from previous event.

0606-0745 S15E22 In 13043 21234 12 Iv (DCM & M - DURN),
and (M-WEIS).

g0809-0910 $15E20 sf 13043 00030 3 Iv (DCM & M-DURN),
duration 18 minutes.
91348-1415 S16E16 sf 13043 10032 6m
1627-1651 S13E10 sn 13043 10130 5
1922-1951 S16E11 sn 13043 10030 4? IV (DKM-SAG), duration
10 minutes. Not re-
ported by BO.

2220-2403 S14E27 sb TV (M & DKM-BO), dura-

and 13043 11132 8 tion >4 hours, called

2252-2356 S15E14 In

14

I, and Cont. (M) by
cL

|
'
|
|
|
|
'



Date

T97T
dan. 1
12

14
16
16

21
24

Feb. 5

14
14
19
20
22
25
27

Apr.

ee
BoONoF

1

20

20

20
21
21

May 3
12
13
14
14

15
16
26

dun, 5

COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ho  McMath Ho Flare Comp. 1-8A
of Flare Position Imp, Plage Profile Flare Max.X-ray Some remarks
or Eventtt Number abcde Index Flux (t) (r)
2013-2043 N13W34 sn 11097 00010 1 s
1844) - od - 00030 3? x IV (DKM-SAG) duration
2 hours, is reported
as III N (M & DKM)
by H.
1223-1243 N14E69 sf 11123
or 00032 5 vs
1237-1500 S15E23 sf 11121
1121-1143 SO9WS6 ib 11111 11213 8 0.051
0804-1030 N18E65 én 11128 22322 11 0.090
1429 - - - 00130 4? x IV (DKM-SAG) reported
as IN (DCM & i)
1320-1353 N19W04 sn 11128 30220 7** — >0.084
2308-2530 N18W49 2b 11128 22333 13** 0.490
'g0524-0558 SO9E13 sn 11145
or 00010 1 vs
0533-0553 NO3W43 sn 11137
1424-1448 N10W75 sn 11140 00030 3 vs
2221-2320 SO9E02 2n 11145 12232 10** 0.009
g0205~0225 S14E85 sf 11163 00010 1 vs
2316-2400 $12E74 in 11163 01010 2 s
g1458-1516 N2OW38 sn 11162 00012 3 vs
0814-0925 N21W45 In 11162 11111 5 >0.017
1423-1522 S14W38 In 11163 01011 3 s
0451 - - - 00010 1 -
0454-0530 $22W87 1b 11163 01012 4 x
There are no "Major
Solar Events" in March.
1300-1430 S19W13 In 11221 11132 8 0.005
0936-1028 $19W80 1b 11221 212-1 26 >0.013
1612 - - 00030 3 x
91317-1345 NO4E88 sn 11249 10030 4 -
g1504-1532 N2ow25 sf 11234 00030 3? s IV (M & DKM - BO),
reported as cont. (DKM)
by SAG.
91637-1646 NO3E65 sn 11249 10030 4 x IV (DCM-H), becomes
continuum at M & DKM-A,
0055-0157 N21W17 in 11256 31100 5 20.056
13-061: N20W19 2b 11256 32202 9 0.490 Also IV (DCM) reported
by CLG, duration only
2 minutes.
SO6W49 in 11250 21221 Exe 0.030
N18W45 sn 11256 10010 2 0.006
N18W48 sn 11256 20111 5 0.009
N1SE47 sb 11294 30213 9 0.150
N13W70 én 11294 22211 8 0.073
N10W85 In 11294 21231 9 >0.073
NO4E11 1b 11312 21232 10** 0.086
- - - 10130 5? 0.013 IV (DKM-BO) called
continuum by CLRO
and SAG,
g1705-1732 NO3E24 sn 11313 00030 3? - IV (DKM-BO) called
continuum by CLRO.
(1236) - - - 00031 4 -
g1525-1643 SO8W18 sn 11340 00030 3 - IV N reported by H,
DCM-A only.
(2118) - - - 00010 1 x
0427-0502 S10W90 sn 11377 00011 22 x Also IV (M), duration

by H.

only 2 minutes, re-
ported by CLG.



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APPENDIX OF "LESSER EVENTS" (continued)

Time (UT) Ho McMath Ho Flare Comp,
Date of Flare Position Imp, Plage Profile Flare Remarks
or Event _ Number abcde Index (r)
1974
May 1 12251231 SO9E75 sb 12906 10133 8? V (DKM-SAG), duration
4 minutes. Not re-
ported by BO.
12 2140-223: S17W63 2n 12906 12000 3
dun. 21 1759-2033 S21W25 if 13002 11200 4? Large 2800 Mliz Burst
ee (OTT Flux = 652, called
a "spike"). Not report-
ed by BO or SAG,

30 0703-0745 S13E44 In 13043 21131 8? V_ (DCM & M - DURN and
WEIS). Duration
8 minutes

Jul. 1 1034-1047 S13E28 sb 13043 10132 7? V (DCM & M - DURN)
duration 1 minute.
Called cont. (DCM)
by WEIS.

1 1556-1650 S14E28 sb 13043 20130 6? IV (DCM & M - DURN),
duration 7 minutes.
Not reported by H
or WEIS.

2 0943-1005 S16E19 ln 13043 21132 9? IV (DCM & M ~ DURN),
duration 8 minutes.

2 g1015-1029 S14E20 sn 13043 00030 3? IV (DCM & M - DURN),
duration 3 minutes

3 0300-0400 S15E08 2b 13043 22202 8

3 0553 - - - 00030 3? Iv (M - DURN), dura-
tion 1 minute.

3 g0725-0733 S17E12 sf 13043 00032 5? IV (DCM & M = DURN),
duration 8 minutes.

3 1811-1821 S10W47 sf 13030)

olin 00130 4? IV (DCM & M = DURN),
1812-1847 S14E06 sf 13043; duration 1 minute.
1529 : - - 00030 3? V_(DCM - DURN),
called continuum at
DKM-\ by SAG. May be
part of earlier event.

5 1157-1305 S15W21 sn 13043 10232 8? IV (DCM & M = DURN),
duration only 0.5
minutes.

6  g1345-1357 S15W33 sn 13043 00131 5? IV (DCM & M = DURN),
duration only 0.3
minutes,

7 1151-1345 S16W48 In 13043 21131 8? IV (DCM & M - DWIN),
duration 2 minutes.

g  g0916-0925 S15W76 sf 13043 00030 3? IV (DCM - DURN), dura-
tion only 0.3 minutes.

14 0935-1000 $12E90 2n 13067 02002 4

22 gl055-1132 S14E25 sf 13088 00031 4? IV (DCM -DWIN), dura-
tion 5 minutes. Con-
tinuum reported at
DKM-A by SAG.

31 0919-0932 SO9W25 sn 13095 00130 4? IV (DCM - DWIN), dura-
tion 4 minutes.

Sep. 11 (1420-2505) - - - 00030 3? IV (DCM - H) reported

in progress all day.
Not flare-associated.

14 (1246-2505) - - - 00030 3? IV (M & DKM-BO) in

26

progress all day.
Called cont. (DKM)
by SAG, and Ic,
drifting chains
(M & DKM) by H.

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Date

1970

Apr. 13
15
18

27

28
28

May = 1
4
15
15

22
22

dun, 2

dul, 1

COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARESt, 1970-1974 (continued)

Time (UT)

of Flare Position

or Eventit

0418-0436 NI6WO1
0413-0530 N13W85
1314 -

(1520) -

N11N79
SO9E35

S13E11
N31E08

0925-1010 SO9W10
2200-2233 SO8W18
0020-0730 N16E12
1857-191 NI7W65

S08W31
SO8W76

S14W28
N18E56

0920-0939 N18E53
1227-1238 N18E51
903-0615 N19E42
1321-1415 N20E42
1415-1530 N18E35

N18E35
N18E22

N15E08

N22E28
N19E04

0103-0148 N19E34

5 N22W33
1945-2045 N21E22
1206-1335 N20E15

2021-2139 N18W17
1758-1921 N19W29

2206-2309 N11W15

2137-2230 N22w90
1648-1711 N24W90

1652-1706 NO8W56
1654-1715 SO9W14

Ho

Imp,

sb
2b

sb
sb

In
af

1b
Ib
In
sb
2b
én
In
sn
Ib
2b

2b
1b

Ib
In
2b

sf

1b
sn

1b

In

1b

In

1b
sf

sf

sf

McMath Ha Flare Comp, 1-84
Plage Profile Flare  Max.X-ray Some remarks
Number abcde Index Flux _(t) (r)
10675 00113 5 -
10670 32333 14** 0.230
- 00032 bhaal s Active Region 10675
is going over the
West Limb.
- 00030 3? x IV (DKM-SAG), not
reported by BO.
10693 10012 4 0.004
10709 10231 7 0.011 IV is DCM only.
10709 11132 Bex 0.006
10714-/5) 02010 3 s A "Spotless" Flare
10722 related to a filament
between the two regions.
10740 31100 5 0.077
10740 31000 4 >0.007
10750 01031 5a 0.008
10743 10011 3? 0.013 II (M&DKM - CLRO),
called III G& V by H.
10760 32101 7 = 0.043
10760 22132 10** = =>0.021
- 00012 3 vs Active Region 10760
- 00112 4 s is beyond West Limb.
10774 11112 6 0.015
10789 10112 5 0.015
10789 20212 7 0.100
10789 21203 8 0.300
10789 32211 9 0,510
10789 12233 11** 0.150
10789 21032 8 0.120 IV is DCM only. May
be a continuation of
preceding event.
10789 31200 6 0.500
10789
22222 10 0.250
10781,
10789 10120 que 0.008
10789 00030 3? s IV (DKM-SAG), duration
10 minutes, not re-
ported by BO, H, or
CLRO.
10808 21112 7 -
10802 00010 1 x
10808 31232 1* 0.330
10808 11232 9 0.099 IV_(DKM-SAG), duration
only 6 minutes, con~
tinuum (DKM) also
reported.
10808 11132 8**? 0,008 II (M) and IV (M&DKM)
reported by CLRO, but
not reported by H.
10808 11133 9**? >0.009 II (M-CLRO) called
"unclassified" by H,
and Vb by SAG.
10813 01010 2ee? vs TI (M&DKM-CLRO), not
reported by CLG.
10808 21112 7 0.086
10808
Three small subflares
10813 20112 6 0.060 in progress at time
of Type II.
10815
3

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Date
1970

dan.

Feb.

Mar.

Apr.

Note:

5
6
8
18
28

30
31

Table I

COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974

Time (UT) Ho  McMath © Ho Flare Comp. 1-8
of Flare Position Imp, Plage Profile Flare  Max.X-ray Some remarks
or Eventit _ Number abcde Index Flux (t) (r)
0415-0525 N15W45, 2n 10506(S) 02010 3 s A "Spotless" Flare
1405-1500 $21E30 if 10516(S) 01010 2 vs A "Spotless" Flare
(0216) - - - 00010 1 vs
1421-1455 S14W39 sn 10525 10010 2 0.013 Xeray Flux Units =
x10-"ergs/cm*/sec
$14W34 2b 10542 32300 8 0.490
SO6W33 Ib 10544 11233 10** 0.097
S22W63 2b 10542 22130 Bee 0.039
SO8W77 sn 10544 00012 3 s
N18WO6 2b 10568 22311 9 0.530
N18W17 In 10568 31000 4 0.130
$13W82 an 10567(S) 02010 3 s A "Spotless" Flare
S18E32 2b 10584 22200 6 0.140
S13W46 sn 10579 10130 5? 0.013 IV (DKM-SAG), called
continuum by BO and
CLRO.
1310-1325 SO8E52 sn 10588 00031 4 vs
1850-1915 NI7E72 sn 10595 10030 4? Ss V (DKM-SAG), called
continuum by BO.
2318-2358 NO7E69 2b 10607 32133 1e** 0.170
1257-1323 NO7E61 sn 10607 30102 6 0.060
N15W30 In 10595 11113 7 20.013
NOSE52 sb 10607 10233 gue 0.047
NO5SE48 1b 10607 31234 13** 0.320
N13W31 2b 10595 22233 1a** 0.094
NOSE46 in 10607 21233 11** — (0,063)
N15W37 2b 10595 22213 10 0.220
1b
NO6E39 { } 10607 21112 7 0.034
sb
NO6E35 In 10607 21233 1i** 0.064
N14W55 1b 10595 21213 9 20.026
N14W79 Ib 10595 11234 1i** 0.039
S14E73 1n 10618 31100 5 0.077
- - - 30201 6 0.047
S14E60 In 10618 31132 10 0.035
S11E09 2b  —:10614(S) 22113 9 0.052 A "Spotless" Flare
$22W90 In 10621(S) 01031 52 s V (DKM-SAG) called
continuum (M & DKM)
by BO, and Ig (M) by H.
A "Spotless" Flare
NOIW31 sn 10630 10132 7** 0.008
SO1N40 in 10630 11112 6 0.013
SO4W45 In 10630 11032 7** 0.006
N19E66 af 10641 02110 4 0.017
- - - 00030 3? s IV (DKM-SAG), not
reported by BO.
~ - - 00020 awe x
N14E10 1b 10641 31232 11** 0.100
NO9EOS sn 10641 00011 2 s
N18W11 sn 10641 00030 3 s
S17W62 In 10633 01010 2 x
NO8W25 sb 10641 10213 7 0.051
NOSE66 2n 10652 22232 11** 0.094
N14W37 2) 10641 22334 14** 0.170
S12E45 2b 10654(S) 22231 10** 0.021 A "Spotless" Flare
$13E30 In 10669 31230 9? 0.039 IV (DCM-CLG) is re-
ported as (cont.- M &
DKM) ‘by BO and CLRO.
N17E56 In 10675 2103~ 6 0.051
N16E55 sn 10675 20132 Be 0.086
S13E50 sn 10674(S) 00010 1 s A "Spotless" Flare

See notes to Table I on page 17.

2

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COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARESt, 1970-1974 (continued)

Time (UT) Ho, McMath Ho Flare Comp,
Date of Flare Position Imp, Plage Profile Flare Some remarks
or Eventtt __ Number abcde Index (r)
1974
dul. 3 0759-0928 S15E08 2b 13043 32234 14
3 1058. - od - 00030 3 V (DCM & M), dura~
tion 13 minutes.
3 g1220-1238 S12E04 sf 13043 00132 6
3 g1418-1438 S17E05 sf 13043 00030 3
4 0610-0800 S15W04 1b 13043 31333 13? IV (DCM & M = DURN),
called continuum by
CLG.
4 S16W07 2b 13043 32333 14**
4 S17W09 sn 13043 10132 7
4 S17W10 In 13043 11202 6 Ic (M & DKM) also
reported by H.
4 S16W12 In 13043 21232 10
4 S14W13 sf 13043 00020 lal Cont. (M-CLG), dura-
tion 12 minutes.
5 S15W23 1b 13043 31232 11
5 S15W26 1b 13043 31334 14%
6 S14W01 sf 13051
00012 3
S17W32 sf 13043,
6 S17W35 1b 13043 21234 12
6 S15W40 Ib 13043 31232 1
7 - - - 0-010 1? No Flare Partol.
Cont. (DKM-BO) in
progress 2312-2605 UT.
8 1540-1610 S17W64 sn 13043 30200 5
9 0179-0215 S15W69 sb 13043 30100 4
9 1355-1405 S17W74 sn 13043 20231 Be
18 012-2020 S11W18 sf IV (M & DKM-BO), dura-
gy and 13063 00030 3? tion >5 hours, reported
2026-2100 S11W21 sf as cont. by SAG & CLG.
23 g2317-2343 S15E06 sn 13088 00030 3 CLG Rdioheliograph
observes IY (160 - 43
MHz). Source location
is in SE Quadrant.
26 0644-0730 S13E50 In 13095 01010 2
and
. 13101
26 2225-2243 S10E35 sn 13095 00112 4

Sep. 10 2120-2340 NOQE6O 2b 13225 32333 14**

12 g202T-2052 N10E32 sn 13225 00032 5 Iv is DCM only (H).

13 15 S14E24 2b 13224 32232 12**

15 - - - 00030 3 IV (DCM-H) .No known
flare. .

15 g1803-1848 N11W11 sn 13225 00030 3 IV (DCM-H).

16 © gi320-T545 NOSW19 sf 13225 00130 4 V (DCM-H).

18 1052-1244 N10W42 In 13225 11132 8

18 1528-1900 NOOW44 In 13225 11132 8 IV (DCM-H).

19 2224-2500 NOSW62 én 13225 22332 12**

23 0021-0045 N13W90 1b 13225 01231 7 No Flare Patrol 22nd
2201-2342 UT. Type
IV begins 22nd 2301 UT.

23 g1200-1206 NO7W90 In 13225 21234 12**

24 (0403)* - - - 00232 7** No Flare Patrol.

Oct. 1 (2302) - - - 00012 3 CLG Radiohel iograph
Places source of II
at East Limb.

3 2047-2145 N10E00 lf 13262 01032 6
5 1158-1222 NO8E90 sn 13280 00030 3

15

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|



COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ha McMath = Ha Flare Comp. 1-8A
Date of Flare Position Imp, Plage Profile Flare  Max.X-ray Some remarks
or Eventtt _ Number abcde Index Flux (t) (x)
1970
Oct. 22 g1951-2011 N21W57 sf 10993 00010 1 x
24 1425-1500 N12W33 sn 10995 00112 4 s
26 1235-1302 NI3E45 sb 11002 30100 4 0.099
27 1212 - - - 30100 4 20.013
27 1414-1435 N11W77 sn 10995 10112 5 0.015
27 2239-2304 N13W84 sn 10995 10110 3 0.010
28 1232-1330 N21E21 2b 11002 32234 14** 30.039
30 2328-240: N15W30 2b 11002 22200 6 >0.004
Nov. 4 2119-2330 N23E16 1b 11018 21121 7** — >0.005
4 2250-2302 N14W85 1b 11002 11110 4 0.030
5 0307-0720 S13E35 3b 11019 33332 14%** 0.230 A major flare in
almost "Spotless"
region.
6 (0649) - - - 00010 1 x
7 (0402) - - - 00010 1 x
10 1430-1455 N19W40 In 11022($) 01010 2 s A "Spotless" Flare.
10 1721-1735 N15W66 sn 11030 10012 4 = 0.009
11 070. - - - 00212 5 s
11 1911-1955 N18E44 sn 11029 00020 axe .
12  g0342-0351 NOSE9O sb 11035 30213 9 s
12 1740 : - - 00032 5 s
15 0625-0850 N15W12 2b 11029 222-2 28 0.410
15 gi315-1330 NI6W11 sn 11029 20030 5 -
15 754-1905 N16W18 1b 11029 31100 5 20.170
16 0042-0232 N16Ww22 2b 11029 32332 13** — >0.180 Van Allen (2-124):
"Greatest X-ray Event
since Nov. 24, 1969",
16 N16W27 2n 11029 322-0 27 0.410
16 N16W27 Ib 11029 31120 7** — >0.200
16 N17W26 1b 11029 11130 6 0.090
7 N16W38 2b 11029 322-0 27 0.490
17 NISW41 In 11029 21130 Tee 0.051
18 $12W19 sn 11032 00112 4 -
18 - - : 00020 awe vs
19 NO1W19 In 11035 21112 7 0.030
21 NO7W40 1b 11035 11212 7 0.051 Also IV (DCM), dura-
tion 6 minutes re-
: ported by H.
23 0007-0021 NO3W53 sb 11035 00012 3
24 1502 - - - 00130 4 -
Dec. 3 (0420) : - - 10113 6 -
5 2259-2426 N15W46 In 11060
or 11110 4 0.013
92330-2352 S17W18 sn 11063
8 0425-0452 N13E80 1b 11077 31100 5 0.300
8 1144-1227 N16E43 sn 11073 00112 4 >0.017
9 0800-0840 N13E70 in 11077 21111 6 0.056
9 1752-1814 NO3E85 1b 11077 11130 6 0.017
11 ‘351-0415 NO4E64 In 11077 01010 2 -
11 1025-105: N10E36 1b 11077 31214 11 >0.008 Also IV (M) reported
by WEIS, duration only
5 minutes.
11 2205-24. N16WO1 in 11073 11332 10** 0.080
12 0901-0922 N10E23 1b 11077 31103 8 >0.100 IV (M) also reported
by WEIS, duration
only 7 minutes.
13 1831-1843 N10E04 sb 11077 10113 6 0.039 IV (DKM) also reported
by SAG, duration only
6 minutes.
7 (0617) - - - 00312 6 vs

a



APPENDIX OF "LESSER EVENTS"

Feb,

Mar.

Apr.

May

dun.

dul.

Aug.

See Notes to Appendix of "Lesser Events" table on p. 17 (same as for Table I).

Time (UT) Ho Ho Flare Comp, 1-84
of Flare Imp, Profile Peak Remarks 1
or Eventi+ __ abcde Flux (r) |
2n 02001 3 +004 f
2n 22100 5 ‘090 |
2n 12100 4 007
2143-2233 1b 21100 4 0.090 |
0620-0700 In 21100 4 0.140 |
0209-0312 sb 20100 3 0.094 |
2110-2345 2b 22100 5 0.490
91605-1710 sf 1003- 242 0.005 IV (DCM-H), duration
only 2 minutes. j
qb 21200 0.094 |
2b 12000 3 - I
2b 22200 6 0.094 |
2n 22101 6 0.060 |
2n 12100 4 0.013 I
2n ;
12100 4 0.013 |
2n i
sn 20033 +005 IV (DKM-SAG), duration
8 minutes, not re-
ported by BO.
2n 22100 5 0.039 I
1b 21100 4 0.051 |
1b 21203 8 0.077 F
1b 21202 7 0.069 |
0656-0805 2b 22100 5 0.064 |
0716-0808 In 21101 5 0.064 I
0145-0322 1b . 21000 3 0.086 |
0137-0223 2F 02000 22 x An unconfirmed flare }
of Imp. 2. j
121-1144 1b 21000 3 0.230 i
db 21200 5 0.064 |
sb 20203 7 0.140 |
in 11120 5 0.100 |
sb 10200 3 0.090 I
sb 20202 6 0.200 |
dn 21202 7 0.200 |
an 12000 3 0.050 I
In 11100 3 0.080 I
sb 10100 2 0.130 |
sb 10100 2 0.064 |
qb 21100 4 0.073 |
2n 02101 4 >0.013 |
2b 12202 7 0.030 |
9259-131 sn 00130 -004 IV (DKM) reported by
—— SAG., duration only
3.5 minutes.
1025-1210 2b 22100 5 0.039
309-0825 sn 20100 3 0.060
140-1200 sl 20102 5 0.034)
2345-2354 sn 10100 2 0.099
91140-1155 In 21000 3 0.086
(1152-2330) - 00030 3? IV (DKM-SAG) in
progress all day.
2204-2225 Ib 21200 5 +110
0824-0441 sn
and 20000 20.060
0426-0445 sn



REPORT UAG-52

WORLD DATA CENTER A
for
Solar-Terrestrial Physics

EXPERIMENTAL COMPREHENSIVE SOLAR

FLARE INDICES FOR CERTAIN
FLARES, 1970-1974

¥

HIS

November 1975

Se



Date
1972

Jan.

Feb

Mar.

13

14

18

19

22
22
23
23
23

26

27

aan

COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ho  McMath © Ho Flare Comp. 1-8A
of Flare Position Imp, Plage Profile Flare Max.X-ray Some remarks
or Eventit _ Number abcde Index Flux (t) (r)
2125-2200 S20E82 In 11693 21130 7**? (0.039) IV (MCLG) is reported
as cont. (M & DKM) by
BO and cont. (M) by H.
0625-0652 S10E65 én 11693)
and/or 02112 6? 0.013 Several Flare choices
0630-0709 SO9W15 In 11687 at time of Type II.
43 - - - 00010 1 x
1525-1553 S10E60 1b 11693 11110 4? >0.044 IV (DCM-H) also re-
ported, duration
4 minutes.
1809-1915 S11E70 in 11693 21130 7** 0.022
S15E49 sf 11693 00010 1 s
S16W39 én 11693 22232 1 0.071
S17W51 1b 11693 11112 6 0.036
N14E55 sn 11709 10013 5 0.009
S10E26 in 11708(S) 01010 2 vs A "Spotless" Flare.
S19E84 sn 11734 10130 5 0.004
S17E79 In 11734 21111 6 0.027
S19E47 2b 11734 22213 10 0.084
S16E23 sn 11734 00031 4 s
N23E04 sn 11741 00232 7 >0.005
NO8E82 sf 11748 1013- 25%* — >0.009 Possibly questionable
flare - association.
S22E87 sb 11751
S23E84 sn 11751 20231 gee 0.150
S14E38 sn 11743
$13E30 sb 11743
Jor 00112 4 0.006
2137-2144 N15E51 sn 11748
1515-1535 NO6E33 In 11748
and/or 21222 gee 0.062
1516-1528 SO9W88 sn 11729
0029-0057 NO3WO2 én 11748 22333 13** 0.093
1310-1413 NO7WO4 1b 11748 31102 7 0.130
0649-0703 S19E23 sn 11751 00110 2 vs
926-195" N15W15 sn 11748 00120 Bak -
2135-2152 NOSW28 sn 11748 00112 4 - Also cont. (DKM)
a in progress.
1805-1834 N11W43 sb 11748 10112 5? - II (DKM-CLRO) is re-
ported as IIIG by H,
BO, & SAG.
(1842) - - - 00012 3? - II (DKM-CLRO), not
reported by H or BO.
- - - 00030 3 x
SO7E42 Ib 11769 213-3 29 0.510
SO08E40 sn 11769 20213 8 0.018
SO8E18 sn
11769 00030 3 vs
$12E21 sn}
SO7E32 sb 11769 20232 9 0.036
SO7E26 Ib 11769 31234 13** 0.160
S11E20 1b 11769 21233 11 -
0029 - - : 00010 1 -
0112-0128 NO8E43 sb 11787 10112 5 0.018
0210-0251 N11E74 lf 11790(S) 01010 2 vs A "Spotless" Flare
1524 - - - 00010 1? - II (M-WEIS) is re-

ported as IIIG(M)
by H.



COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ho  McMath = Ho Flare Comp. 1-88
Date Position Imp, Plage Profile Flare  Max.X-ray Some remarks
—— ‘Number abcde __ Index Flux (t) (r)
1971
dun, 29 N18W15 sn 11393 20132 8 0.022
29 N18W17 sb |
“ 11393 10032 6 0.009 |
lg N16W18 sf ;
29 N1gW22 sb 11393 10233 gee - i]
30 N17W33 sn 11393 10011 3 -
dul, 1 S13E19 1b 11402 11112 6 0.015 |
19 2105: NO7W10 sf 11425 00022 axe -
24 1758: NO7W77 sn 11425 10210 4 0.013 ii
Aug. 3 SO8E80 In 11457 01011 3 Ss }
20 1 - - - 00032 5 x IV (DCM-H), called |
IIIN and continuum by
other observers, at
M & DKM-d.
Sep. 1 (1934) - - - 00232 7** s |
8 1836-1905 S13W73 sn 11496 00030 Bie s
12 617-1653 S17E85 sf 11516 10030 qee 0.044
13 2412 S14E72 sb 11516 10110 3 0.013
14 2412 S14E59 sn 11516 10112 5 >0.022
15 0440 S12E53 In 11516 21112 7 0.040 |
7 -T610 S17E22 1b 11516 11011 4 0.018 t
Oct. 3 1330-1530 N13E14 2n 11537 32232 12** 0.080
10 0024-0115 N12W73 In 11537 31000 4 20.031
19 1302-1405 NO9E31 1b 11565 31101 6 20.053 |
Nov. 15 0605-0630 S15E59 sn 11610 00010 1 s |
18 2254 - - = 00030 alal x t
19 2031-2044 S12W77 sf 11615 00010 1 x i
21 = giS12~1516 N14E86 sf 11621 00010 1 -
22 1511-1600 N15E72 1b 11621 21332 11** 0.190
23 0537-0650 S18E59 1b 11619 21322 10** 0.049
Dec. 2 S15W66 1b 11619 21231 gee 0.058 i
2 S15W68 sn 11619 10231 7? 0.015 IV and Cont. from |
previous event still
in progress.
5 g1932-1945 S12E68 sf 11639 00010 1 vs
14 24 - - - 00132 6** x '
14 g0557-0635 N19E33 sf 11647 00133 7 vs i
15 — g1323-7500 NO8W14 sn 11645 00030 3 vs |
29 11-2325 S21W74 In 11657 21232 10** = (0.071) |
30 2034)* - - - 1-110 23 - No flare patrol
30 (2258)* - - - 1-110 23 0.022 No flare patrol.
Active region 11657
is going over West
Limb on Dec. 30th. j
31 (0125) - - - 10010 2 0.008 f
1972
Jan 1 (1831) - - - 00010 1 vs
3 (0402) - - - 00010 1 x
4 (1519) - - - 00200 2 -
8 (2006) - - - 00030 3 x
10 0204-0305 S11E47 In 11687 01010 2 0.002
10 g2212-2279 S08E30 sn 11687 00030 3**? 0.002 IV (M-CLG) is report- |
ed as cont. (M & DKM) |
by BO. |
7





Time (UT)
Date of Flare Position
or Eventtt
1974
Oct. 6 (1400-2425) -
7 (1306-2423) -
8 (1303-2425) -
9 (1303-2430) -
10 (1314-2420) -
11 -g0755-0818 N1OE14
ll 0828-0845 N10E13
11 1207-1253 N13WO4
11 g1255-1311 N10E11
11 (1304-2407) -
12 1310-1334 N1OW04
13 0839-1110 N12W26
15 0810-0900 NOOW43
15 1324-1430 NOSW47
16 1258-1415 N11W61
Nov. 6 gl217-1234 S$13W90
6 (1304) -
7 (1216) -

APPENDIX OF "LESSER EVENTS" (continued)

Ho  McMath = Ha Flare Comp. 1-84,
Imp Plage Profile Flare Peak Remarks
_. Number abcde Index Flux r

- - 00030 3? IV (DKM-BO) in prog-
ress all day.

- - 00030 3? IV (M & DKM ~ BO),
in progress all day.

- - 00030 3? IV (M & DKM - BO),
in progress all day.
Preceded by minor
sub-flare in region
13280 (at N10E45).

- - 00030 3? V (M & DKM-BO), in
progress all day.

- - 00030 3? Iv (M & DKM - BO),
in progress all day.

sn 13280 00032 “5? Iv (DCM & M - DURN),
duration 2 minutes.

sn 13280 10033 7? IV (DCM & M - DURN),
duration 4 minutes.

sn 13280 00030 3? IV (DCM - DURN), dura-
tion only 0.2 minutes.

sn 13280 10132 7? . IV (DCM & M - DURN),
duration 3 minutes.

- - 00030 3? IV (M & DKM - BO), in
progress all day.

sn 13280 00130 4? (xin - SAG), dura~
tion 8 minutes.

In 13280 11132 8? TV (M - DURN), dura-
tion only 1.3 minutes.

2n 13280 12201 6

Ib 13280 21200 5

1b 13280 21100 4

sb 13310 10131 6? IV (DCM & M = DURN),
duration 0.3 minutes
and 1.2 minutes.

- - 00031 4? Iv (DCM & M - DURN),
duration 6 minutes.

- - 00030 3? Iv (DCM & M - DURN),

27

duration 1.8 minutes.



COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ho. McMath Ha Flare Comp. 1-8A
Date of Flare Position Imp, Plage Profile Flare Max.X-ray Some remarks
or Eventtt+ _ ‘Number abcde Index Flux (t) (x)
1970
dul. 7 (1711) - - - 00012 3 x Another II, perhaps
related to preceding
event.
13 1715-1728 N13E87 sn 10838 10013 5 0.005
14 g0650-0702 S15E90 sn 10837 10010 2 0.008
19 0052-0157 NO8E68 1b 10845 31121 8 0.077
20 1109-1237 NO8ES5 2b 10845 32332 13 0.490
20 gi836-T93T NO7E45 sn 10845 10030 42 s V (DKM-SAG), Dura-
~~ tion 12 minutes,
called "unclassified"
burst by CLRO.
20  g2010-2106 NOSE43 sn 10845 10131 6 0.034 IV is DCM only.
21 0437-0642 NOSE45 In 10845 21131 8 >0.021
21 1554-1629 N17W76 sn 10830 10130 5? 0.006 IV (DKM-SAG) called
continuum by H and
CLRO.
22 NO8E33 1b 10845 21332 i 0.140
22 N21E75 In 10846, 11110 4 0.006
22 NO3W90 sn 10831
10030 4? - IV (DKM-SAG) called
NO8E18 sn 10845, cont.(M & DKM) by CLRO.
22 NO6E18 sb 10845 10213 7 0.009
23 N1OE13 In 10845 31133 11 0.030
23 NOQEO9 1b 10845 21333 12 0.200
27 N11W38 In 10845 31222 10 0.039
30 N11E02 In 10852 01011 3 s
Aug. 4 - - - 0-010 1 - No Flare Patrol at
time of Type II.
10 N19W26 sn 10865 10030 4 :
11 N18E00 sf 10868 20232 gee 0.047
12 NI1E90 1b 10882 31333 13** —>0.490 A bright limb flare
with loops.
12 g2106-2118 N18W14 sn 10868 10022 bee -
12 g2153-2210 N18W52 sn 10865 00010 1 vs
14 any 1700 N10E74 1b 10882
\e ind7or 31233 12 0.440
1604-1657 NI6W72 sn
is 820 NI7H75 it) 10866
16 N17W90 sb 10865 10030 4? 0.043 IV (DKM-SAG) called
continuum by CLRO.
19 1117-1128 N22W89 sn 10868 30232 10? 0.490 IV (DKM-SAG) reported
in progress all day.
19 (1758) - - - 20010 3? x Questionable SWF.
25  g1836-1847 N17W57 sn 10887 00010 1 x
26 1436-1525 SO7W74 sn 10890 00012 3 s
26 1528 bg - - 00010 1 x
30 = g1314-1331 NO8W53 sb 10917 10112 5 0.011
Sep. 1 N20E90 sn 10922 10011 3 0.026
4 N21W19 lb 10913 21120 6** 0.017
5 N19W22 sn 10913
\ 00131 5 0.008
N14E05 sn 10918
8 N13W47 1b 10918 21232 10 0.039
9 N13W66 sn 10918
00010 1 x
SO9E40 sn 10931
15 NOSW40 in 10933(S) 01010 2 vs A "Spotless" Flare
23 N13E36 sn 10959 00020 oe s
24 NOOW11. if 10948 01020 ote s
26 N17W66 In 10946 01012 4 -

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NUMBER 1965-1969

60—
- 412 "Major" flares NUMBER
40- 41 With index >10 40
-_
20-— —20
aa a eT) oF i a
CFI U.T.
- 1970-1974
60 550 "Major" flares
_ 59 With index >10 _
40— —40
20— —20
o- I 41-0
3S Te WB ST 0 '2" 4a" "6" "a 0 12 4 16 We 20 22
CFI UT.
Fig. 1A. Distribution of "Major" Flares by Comprehensive Flare
Index (CFI) and UT, Solar Cycle 20; 1965-69, 1970-74.
Data for Flares in the Appendix
s0- 1970-1974
4o- 203 other flores of possible interest
_ © With index >10
20- -20
o- 0

8 10 (2 14 16 18 20 22
UT.

Fig. 1B. Distribution of "Lesser" Flares (see Appendix) by
Comprehensive Flare Index (CFI) and UT, 1970-74.

18



APPENDIX OF "LESSER EVENTS" (continued)

Time (UT) Ho  McMath = Ho Flare Comp, 1-8A
Date of Flare Position Imp, Plage Profile Flare Peak Remarks
or Event tt Number abcde Index Flux (r)
1972
Apr. 20 (0950-2326) - - - 00030 3? IV (DKM-SAG) in prog-
ress all day. Reported
as continuum (M & DKM)
by BO, and In (M) by H,
all day. Probably re-
lated to region 11827,
CMP Apr. 21.
21 (0957-2328) - - - 00030 3? IV (DKM-SAG) in prog-
ress all day.
May 12 1928-1938 N21W48 sb 11857 00132 6? 0.005 IV_(DKM-BO), duration
only 8 minutes.
18 Bm. 1430 S14E25 1b 11883 21200 5 0.040
18 1648 S16E24 1b 11883 21200 5 0.040
29 it NO8E16 1b 11895 21222 9 0,049
dun. 24 1911-1949 NOQE23 sb 11933 20100 3 0.040
Jul. 4 1804-1846 S11E67 sn 11949 20100 3 0.044
Aug. 3 (0931-2600) - - - 00030 3? IV (M & DKM) reported
: by BO all day, called
Ic (M & DKM) by H, and
cont. (M) by CLG. Not
flare-associated. Re-
lated to active region
11976 (CMP, Aug. 4).
4 (1205-2547) - - - 00030 3? IV (M & DKM) reported
by BO, in progress all
day. Called cont. (M)
by CLG, and I (DCM & M)
by H. Related to
region 11976 at CHP.
7 g1922-2047 N12W41 sn 11976 00030 3? x Iv (DCM-H), only
5 minutes duration.
22 1205-1340 S21E56 2b 12002 22122 9 0.021
29 = gi619-1631 N11E75 sf 12011 00030 3? x IV (M & DKM-BO), but
duration only 0.1
minutes.
30 1955-2053 N16E39 sb 12011 10103 5 0.049
Sep. 5 1729-1805 N17W24 In 12011 11031 6? 0.004 IV_(DKM-SAG), duration
- only 7 minutes.
26 0809-0841 S17W42 af 12040 02000 2 s
Oct. 25 0623-0635 $12E60 In 12094 11102 5 0.049
25 mm ~T043 S13E59 Ib 12094 21002 5 0.277
26 638-0728 $12E47 2b 12094 22201 7 0.310
26 ee SO5E43 2b 12094 12102 6 20.010
30 0722-0830 S10W04 in 12094 112-2 26 0.049
31 0417-0547 S14W15 1b 12094 21100 4 0.196
31 (1335-2327 - - - 00032 5? IV (M & DKM) reported
by BO, in progress all
day. Called In and
cont. (M & DKM) by H
and SAG. Probably not
flare-associated.
1973
Feb. 22 0802-0803 NO9E90 sb 12246 200-0 22 0.043
22 1500-1510 S11W58 af 12228(S) 02000 2 - A "Spotless" Flare.
22 2346-2413 NO9E9O 2n 12246 22000 4 0.094





COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ho. McMath Ha Flare Comp. 1-8A
Date of Flare Position Imp. Plage Profile Flare Max.X-ray Some remarks
or Eventtt __ Number abcde Index Flux (t) (r)
1973
dan. 6 1350-1442 N13E13 In)
and 12164 21130 Tee 0.029
1447-1451 N13E10 If,
6 2053) - - - 00010 1 -
7 1638)* - - - 00010 1 - No Flare Patrol.
7 (1702)* - - a 00010 1 vs No Flare Patrol.
9 0447-0505 NOQWS3 ln 12160 01110 3 0.005
11 0035-0127 N11W80 1b 12160 31132 10**  >0.014
11 1807 - - - 20132 8** — >0.007
Feb. 10 S13E45 sn 12224 00011 2 0.003

14 N16W65 if 12223 01030 4 0.009 IV (M & DKM-BO)
is called cont. (M)
by CLG.

16 - - - 10031 5** 0.007

18 SO6WO6 An(S) 12228 01132 7 0.004 Region is Spotless
on day of flare.

28 NOGE13 sn 12246 00030 3 vs

28 NO8WOL Ib 12246 21131 Bee 0.065

Mar, 1 NO7WO8 1b 12246 21212 8 >0.084

12 S18W22 1b 12261 11132 al 0.009

B N10W48 sn 12259 10132 7 0.013

14 $10W09 sn 12263

and
12264 IV (M-BO) reported
and/or 00032 Sek? - as I and cont. (DCI
1514-1530 S17W52 sn 12261 & M) by H.
14 2253-2306 S18W56 sn 12261 00010 1 0.008 (Wek)
15 2042-2715 S13W28 sf IV (M-H) is reported
ofSee-2020 — SosNao Sn} 12263032 5 0-004 as Is and cont. (DCM
& M) by CLG.

15 g2247-2303 S07W31 sf 12263 00130 4 x IV (M & DKM-BO) is
reported as Is and
continuum at M-A
by CLG.

20 1111-1128 N16E22 sb 12273 10112 5 0.004

22 (0230-0318) - - - 00031 4 s Moving Type IV on CLG
Radioheliograph related
to eruptive prom. at
East Limb.

26 = g2358-2400 N15W51 1b? 12273 01030 4? - IV (M & DKM-BO) is a
change from cont. in
progress. Is and
cont. (M) reported
by CLG.

29 (2250) - - - 00030 ote 0.004

Apr. 1 1703-1734 N13E44 sb 12298 00111 3 0.013 Also cont. (DKM-B0)
in progress all day.
1 2202-2310 N13E42 in 12298 01011 3 0.014
4 1129-1255 $13E70 In 12300 11122 7** 0.009
10 1223-1300 S07E09 sb 12306 30132 9 0.072
10 1300-1327 SO8E09 sb 12306
and 12132 9 - 12300 and 12306 are
1300-1520 $12W20 én 12300 "adjacent regions",
and constitute a
"zone" on the sun.

11 1838-2200 SO9W10 1b 12306 21232 10** 0.209

22 g1227-1239 N13E25 sf 12322 00030 3 s

22 2145-2230 N13E20 sn 12322 10132 7** 0.014

24 © gi413-1449 N14WO3 sn 12322 10232 ax* 0.008

11

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t
}



COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT)
Date of Flare Position
or Eventt+
T973
dul. 18 0217-0303 N14w46
26 —g0000-0017 N18E88
27 2027 -
29 1312-1600 N14E45
Aug. 13 (0616) -
al 1344-1433 N12E90
21 (1825) -
Sep. 4 0036-0058 S17E32
gyand7or
0052-0106 N13E27
4 (91454-1510 S17W12
1459-1518 N12E18
g1507-1518 S12E55
5 1828-1834 N11E04
7 1139-1345 S17W46
8 1720 -
ll 0654-0737 S11W55
14 2338 -
7 (1516) -
23 1747-1816 S14E32
Oct. 3 2031-2103 N18E08
4 1031-1220 S14w44
5 1928-1957 S15W42
gsand/or
1937-2039 S12W59
6 S16W68
7 N14W64
27 N18E54
.30 S15W34
Nov. 1 1925-2052 S17W65
3 0012-0100 S20W85
4 1935 -
26 1334-1400 SO9E11
27 0306-0325 S07E03
Dec. 3 (0607) -
22 0300-0328 S19E03
23 (0000) -

Hot

Imp,

sn

sn

3b

McMath Ho Flare Comp,  1-8A
Plage Profile Flare  Max.X-ray Some remarks
Number abcde Index Flux (t) (r).
12431 00032 5** - IV (160 and 80 MHz)
observed by CLG
Radiohel iograph.
12461 00010 1 -
- 00010 1 -

12461(S) 23231 11* 0.071 A great "Spotless"
. Flare.
- 00011 2 -

12497(S) 02031 6 s A "Spotless" Flare
IV (M & DKM-BO) is
reported as cont.
(DKM) by SAG.

- 00030 3 x

12512

00112 4 vs

12510:

12507 Three widely-scattered

12510 10112 5 0.013 but concomitant sub-

12513 flares at time of
Type II.

12510 10112 5 0.013

12507 32232 12** 0.140

- 00010 1 -
12520 01111 4 0.013
- 00030 3 x
- 00020 axe x

12534(S) 00011 2 s A "Spotless" Flare.

12543 00010 1 :

12540 11010 3 0.004

12542

00010 1 s

12540

12540 00010 1 s

12543 00010 1 vs

12590 12131 Be 0.031

12584 00032 5 0.004

12584 10131 6 0.008

12584 21233 11** 0.170

- 00030 34% 0.004
12628 11112 6 0.018
12628 10111 4 -

- 00010 1 -

12664 00010 1? s IIN (M) reported by
CLG, duration
>4 hours,

- 00010 1? x IIN (M) reported by

CLG for >7 hours.
Perhaps not flare-
associated.

13



WORLD DATA CENTER A

for
Solar-Terrestrial Physics

REPORT UAG-52

EXPERIMENTAL COMPREHENSIVE
SOLAR FLARE INDICES FOR CERTAIN FLARES, 1970-1974

compiled by

Helen W. Dodson and E. Ruth Hedeman

McMath-Hulbert Observatory
The University of Michigan
895 Lake Angelus Road
Pontiac, Michigan 48055 U.S.A.

November 1975

Published by World Data Center A for SW

Solar-Terrestrial Physics, NOAA, Boulder, Colorado
and printed by

G
U.S. DEPARTMENT OF COMMERCE Zi SS
NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION TIWS
ENVIRONMENTAL DATA SERVICE
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Remittance and correspondence regarding subscriptions should be sent to the National Climatic
Center, Federal Building, Asheville, NC 28801, Attn: Publications.

*Price of this issue 9 cents



Nov.

ce
StS
EIS

4

Apr.

APPENDIX OF "LESSER EVENTS" (continued)

22

Time (UT) Ho. McMath Ha Flare Comp, 1-84
of Flare Position Imp, Plage Profile Flare Peak Remarks
or Eventtt Number abcde Index Flux (r)
(1126-2300) - - - 00030 3? V (DKM-SAG) in
progress all day.
(1219-2219) - - - 00030 3? IV (DKM-SAG) in
progress all day.
g1349-1551 N19E88 sn 10913 10103 5 0.051
N1SW19 2n 10959 12100 4 >0.013
SO9E24 én 10964 12101 5 0.021
S10E07 2n 10971 12101 5 0.026
~2230 NI9E79 In 11002 21102 6 0.140
}-0632 N18E75 2n 11002 121-1 25 >0.064
14) NI7E60 In 11002 21000 3 (0.032)
314 NI7E49 sn 11002 100-0 21 0.056
03 N16E51 In 11002 111-0 23 0.064
32: N15WO3 in 11029 11102 5 0.056
1520 N17E01 sb 11029 20000 2 0.069
2040, N15WOos sn 11029 10000 1 0.056
0613 N16W10 sn 11029 20100 3 20.060
347 N16W33 in 11029 21102 6 0.069
158 N15W35 1b 11029 21100 4 (0.036)
1755-1840 N16W45 in 11029 21100 4 (0.057)
2233-2325 N16W47 In 11029 21102 6 (0.032)
0135-0330 N15W5O 2n 11029 22200 6 20.280
O408- 0432 N16W52 sn 11029 20120 5 0.110
1322-1400 NOSW46 In 11035 21100 4 (0.033)
0953-1010 N21E90 2n 11073 22102 7 0.051
346-2417 N12E16 sn 11077 10203 6 (0.036)
(1301-2107) - - - 00030 3? IV (DKM-SAG) all day.
(1219-2114) - - - 00030 3? IV (DKM-SAG).
(1224-2107) - - - 00030 3? IV (DKM-SAG).
1245-1350 N23w44 1b 11084 21000 3 0.056
1517-1555 N23W43 1b 11084 21200 5 0.090
0840-0845 N12W85 In 11084 11102 5 0.070
~ (1218-2125) - - - 00030 3? IV (DKM-SAG), not
flare associated.
Coincident with M-\
emission all day on
single frequency
record.
S24W77 sn 11124 20101 4 >0.077
SO6W84 sn 11111 20001 3 0.064
1524-1635 SO8E33 1b 11145 11131 7? >0.009 IV (DKM-SAG) duration
7 minutes, not re-
ported by BO.
0438-0607 N17W23 én 11137
and (S) 02000 2 x A "Spotless" Flare at
11146 location of a filament
between two regions.
0428-0608 N28W60 af 11146(S) 02000 2 >0.001 A "Spotless" Flare
0410 - - - 20000 2 0.060
g0836-0847 S16E84 sb 11165 20000 2 (0.038)
15! 622 S17E82 sn 11165 20000 2 0.073
0325-0340 S19W90 2b 11221 12000 3 0.005 Region 11221 is just

beyond West Limb, on
invisible hemisphere.

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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]

Glaciology: Rotation of the Earth:
World Data Center A: World Data Center A:
Glaciology Rotation of the Earth
U.S. Geological Survey U.S. Naval Observatory
1305 Tacoma Avenue South Washington, D. C., U.S.A. 20390
Tacoma, Washington, U.S.A. 98402 [Telephone: (202) 254-4023]

[Telephone: (206) 593-6506]

Solar-Terrestrial Physics (Solar and

Meteorology (and Nuclear Radiation): Interplanetary Phenomena, Lonospheric
World Data Center A: Phenomena, Flare-Associated Events,
: Geomagnetic Variations, Magnetospheric
Meteorology and Interplanetary Magnetic Phenomena
National Climatic Center n Comic Revs. ki tow). >
Federal Building urora, Cosmic Rays, Airglow):
Asheville, North Carolina, U.S.A. 28801 World Data Center A
[Telephone: (704) 258-2850] for Solar-Terrestrial Physics

Environmental Data Service, NOAA
Boulder, Colorado, U.S.A. 80302

Oceanography: [Telephone: (303) 499-1000, Ext. 6467]

World Data Center A:

Oceanography :
National Oceanic and Atmospheric Solid-Earth Geophysics (Seismology,
nee . Tsunamis, Gravimetry, Earth Tides,
Administration Recent Movements of the Earth!
Washington, D. C., U.S.A. 20235 Crust, Moeneth Measurements.
[Telephone: (202) 634-7249] rust, Magnetic Measurements ,

Paleomagnetism and Archeomagnetism,

Volcanology, Geothermics):
Rockets and Satellites: World Data Center A

World Data Center A: for Solid-Earth Geophysics

Rockets and Satellites Environmental Data Service, NOAA
Goddard Space Flight Center Boulder, Colorado, U.S.A. 83002
Code 601 [Telephone: (303) 499-1000, Ext. 6521]

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

Notes:

(1)

(2)
(3)

World Data Centers conduct international exchange of geophysical observations in accordance
with the principles set forth by the International Council of Scientific Unions. WDC-A is
established in the United States under the auspices of the National Academy of Sciences.
Communications regarding data interchange matters in general and World Data Center A as a
whole should be addressed to: World Data Center A, Coordination Office (see address above).
Inquiries and communications concerning data in specific disciplines should be addressed to
the appropriate subcenter listed above.



UAG-35

UAG-36

UAG-37

UAG-38,

UAG-39

UAG-40

UAG-41

UAG-42

UAG-43

UAG-44

UAG-45

UAG-46

UAG-47

UAG-48

UAG-49

UAG-50

UAG-51

UAG-52

“Catalogue of Digital Geomagnetic Variation Data at World Data Center A for Solar-Terrestrial
Physics", prepared by Environmental Data Service, NOAA, Boulder, Colorado, July 1974, 20 pages,
price 20 cents.

"An Atlas of Extreme Ultraviolet Flashes of Solar Flares Observed Via Sudden Frequency Devia-
tions During the ATM-SKYLAB Missions", by R. F. Donnelly and E. L. Berger, NOAA Space Environ-
ment Laboratory, Lt. J. D. Busman, NOAA Commissioned Corps, B. Henson, NASA Marshall Space
Flight Center, T. B. Jones, University of Leicester, UK, G. M. Lerfald, NOAA Wave Propagation
Laboratory, K. Najita, University of Hawaii, W. M. Retallack, NOAA Space Environment Laboratory,
and W. J. Wagner, Sacramento Peak Observatory, October 1974, 95 pages, price 55 cents.

“Auroral Electrojet Magnetic Activity Indices AE(10) for 1966", by Joe Haskell Allen, Carl C.
Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Environ-
mental Data Service, December 1974, 142 pages, price 75 cents.

"Waster Station List for Solar-Terrestrial Physics Data at WDC-A for Solar-Terrestrial Physics",
by R. W. Buhmann, World Data Center A for Solar-Terrestrial Physics, Juan D. Roederer, Univer-
sity of Denver, Denver, Colorado, M. A. Shea and D. F. Smart, A.F.C.R.L., Hanscom AFB, Massa-
chusetts, December 1974, 110 pages, price $1.60.

“Auroral Electrojet Magnetic Activity Indices AE(11) for 1971", by Joe Haskell Allen, Carl C.
Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Environ-
mental Data Service, February 1975, 144 pages, price $2.05.

"H-Alpha Synoptic Charts of Solar Activity For the Period of Skylab Observations, May, 1973-
March, 1974", by Patrick S. McIntosh, NOAA Environmental Research Laboratory, February 1975,
32 pages, price 56 cents.

“H-Alpha Synoptic Charts of Solar Activity Durina the First Year of Solar Cycle 20 October,
1964 - August, 1965", by Patrick S. McIntosh, NOAA Environmental Research Laboratory, and
Jerome T. Nolte, American Science and Engineering, Cambridge, Massachusetts, March 1975,
25 pages, price 48 cents.

“Observations of Jupiter's Sporadic Radio Emission in the Rance 7.6-80 MHz 10 December 1971
through 21 March 1975", by James W. Warwick, George A. Dulk, and Anthony C. Riddle, Depart-
ment of Astro-Geophysics, University of Colorado, Boulder, Colorado 80302, April 1975,

49 pages, price $1.15.

"Catalog of Observation Times of Ground-Based Skylab-Coordinated Solar Observing Programs",
compiled by Helen E. Coffey, World Data Center A for Solar-Terrestrial Physics, May 1975,
159 pages, price $3.00.

"Synoptic Maps of Solar 9.1 cm Microwave Emission from June 1962 to August 1973", by Werner
Graf and Ronald N. Bracewell, Radio Astronomy Institute, Stanford University, Stanford,
California 94305, May 1975, 183 pages, price $2.55,

“Auroral Electrojet Magnetic Activity Indices AE(11) for 1972", by Joe Haskell Allen, Carl C.
Abston and Leslie D, Morris, National Geophysical and Solar-Terrestrial Data Center, Environ.
mental Data Service, May 1975, 144 pages, price $2.10.

“Interplanetary Magnetic Field Data 1963-1974", by Joseph H. King, National Space Science
Data Center, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, June 1975, 382
pages, price $2.95.

"Auroral Electrojet Magnetic Activity Indices AE(11) for 1973", by Joe Haskell Allen, Carl C.
Abston and Leslie D. Morris, National Geophysical and Solar-Terrestrial Data Center, Environ-
mental Data Service, June 1975, 144 pages, price $2.10.

"Synoptic Observations of the Solar Corona during Carrington Rotations 1580-1596 (11 October
1971 - 15 January 1973)", by R. A. Howard, M. J. Koomen, D. J. Michels, Ry Tousey, C. R.
Detwiler, D. E. Roberts, R. T. Seal and J. D. Whitney, E.0. Hulbert Center for Space Research,
NRL, Washington, D. C. 20375 and R. T. and S. F. Hansen, C. J. Garcia and E. Yasukawa, High
Altitude Observatory, NCAR, Boulder, Colorado 80303, July 1975, 200 pages, price $3.00.

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

"High-Latitude Supplement to the URSI Handbook on Ionogram Interpretation and Reduction", by
W. R. Piggott, British Antarctic Survey, c/o SRC, Appleton Laboratory, Ditton Park, Slough,
England, October 1975, 292 pages, price $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, E. 0. Hulbert Center for
Space Research, Naval Research Laboratory, Washington, D. C. 20375 U.S.A., November 1975.

30 pages, price 54 cents.

"Experimental Comprehensive Solar Flare Indices for Certain Flares, 1970-1974", compiled by

Helen W. Dodson and E. Ruth Hedeman, McMath-Hulbert Observatory, The University of Michigan,
895 Lake Angelus Road North, Pontiac, Michigan 48055 U.S.A., November 1975.

USCOMM-NOAA~ASHEVILLE-12-75~-1150



APPENDIX OF "LESSER EVENTS" (continued)

Time (UT) Ho = McMath = Ha Flare Comp, 1-8A
Date of Flare Position Imp, Plage Profile Flare Peak Remarks
or Event tt —_ ‘Number abcde Index Flux r

1973

Mar. 12 0357-0448 S16W21 sn 12261 00031 4? >0.002 V_(M-CLG), duration
only 6 minutes.

13. g0836-0930 SO7E07 sn 12263 00132 6? IV (DCM-WEIS), dura-
tion only 4 minutes.

28 0100-0130 NO4WwO1 sn 12280 00130 4 0.004 IV (M-CLG), duration
only 9 minutes.

Apr. 8 91733-1750 SO8wo4 sn 12300 00031 4? vs IV (DCM & M-H), dura-
tion only 4 minutes.

10 —_g0026-0148 S08E14 sb 12306 20102 5 0.050
30 2247-2312 N13W89 sn 12322 20100 3 0.072
May 1351-1510 S13E75 sn 12336 20102 5 20.043
2031-2104 S15E73 sn 12336 20130 6? 0.036 IV (DCM-H), duration
only 6 minutes,
2 0730-0758 S14E65 sn 12336 20100 3 0.079
2 1148-1200 S13E62 sb 12336 20103 6 0.075
2 2038-2135 S14E59 sb 12336 20101 4 0.050
18 2154-2215 NOQE32 sb 12352 20103 6 0.076
20 0625-0615 $10W33 sn 12349
and/or } 20222 8 0.050
0558-0617 NO8E15 sb 12352
21 (1031->2400) - - - 09030 3? IV (DKM-SAG) all day.
Reported as cont. (DKM)
all day by BO, and
Ic(M) by H. Probably
related to CMP of
region 12352.
dun. 28 1842-1852 N11E90 In 12417
and/or 21100 4 0.067
(91903-1909 SO6W66 sf 12397
29 1947-2008 N12E81 In 12417 11200 4 0.053

Jul. 16 (2330) - - - 00030 3 x IV, 160 and 80 MHz,
reported from CLG
radioheliograph, with
source location beyond
West Limb. Could the
date be wrong? See
similar major event on
duly 15.

24 0910-0950 SO03W90 af 12448(S) 020-0 2 x Flare reported by
only 1 station.
A "Spotless" Flare.

Sep. 6 0912-1929 NO6W90 1b 12511 - 21100 4 0.110

1974

Jar 10 (1850) - - - 00200 2? - Large 10 cm. burst
(flux >500) reported
by PENN. Not reported
by OTT or SAG.

Feb. 20 g1330-1500 $18W30 sn 12752 00132 6? - IV (DCM-DWIN), dura-
tion 2 minutes. Re-
ported as V at DKM-A
by SAG.

Apr. 13 $1129 2b 12848 12200 5 0.035

13 $12W31 In 12848 21000 3 >0.130
13 S12W33 In 12848 21101 5 0.078
13 S12W35 In 12848 21000 3 >0.038

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COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARESt, 1970-1974 (continued)

Time (UT) Ha  McMath Ha Flare Comp. 1-8A
Date of Flare Position Imp. Plage Profile Flare  Max.X-ray Some remarks
or Eventy+ Number abcde Index Flux (t) (r)
1972
Apr 9 2318-2343 $1173 1b 11799 11031 6** — (0.022)
28 2250 - - - 00010 1 x
May 6 0026-0355 S20E30 af 11856 02030 5 vs
8 1527-1630 S18E04 sn 11856 00130 4? 0.005 V_(M & DKM-BO),
called cont. (DKM)
by SAG.
16 0307-0410 SO6W15 1b 11870 21232 10 0.044
17 2234-2345 NISE33 2b 11882 22230 gue 0.071
20 2233 - - 00030 3 vs
24 0705-0740 NO8E87 1b 11895 31232 11** = >0.510
24 (1620 - - - 00030 3 vs IV (DKM-BO) reported
as I at M-\ by H.
24 (1906) - - - 00130 4 x
28 NO9E30 2b 11895 32333 14** — >0.510
dun. 3 N10W53 In 11895 21232 10** 0.013
6 N10W90 1b 11895 31101 6 0.080
8 SO6W30 sf 11911 00011 2 vs
12 S11E53 1b 11926 31132 10** 0.190
15 S11E10 In 11926 21212 8? 0.013 During CINOF Project,
the flares of June 15
were reevaluated as
Importance 2
15 1247-1500 S12wo2 In 11922 21131 8? 0.062 V (M & DKM-BO) is
and reported as cont.
11926 (DKM) by SAG.
20 1916-1923 NO4E85 sb 11933 10132 7**2 0.036 IV (DKM-SAG) duration
9 minutes. Reported
as IIIG & V by He
21 0338-0348 NO4E85 sn 11933 00012 3 s
23 1755 NO8E39 In 11933 21111 6 0.120
24 NO9E30 1b 11933 31232 11** 0.180
25 NO8E20 1b 11933 11132 Bee 0.022
29 - - - 00030 3 -
dul. 11 1352-1505 S10W25 In 11949 21130 7 0.018 IV is DCM only (H)
15 OF0F-0427 So9Ww44 sn 11959 00011 2 -
-19 0345 - - - 00011 2 x
19 0420 - - - 00010 1 -
22 (0134) - - - 00010 1 x
22 (0334) - - - 00010 1 x
22 0549-0630. S08W50 sn 11958 00010 1 -
27 0632-0700 SO5E19 sn 11968
and 00011 2 0.003
0632-0642 S10W64 sn 11971
Aug. 2 0316-0451 N13E35 1b 2
{Oooo bean NI4E34 ang 11976 32322 12 20.179 "0 iynente secre
2 1838-1859 N14E26 1b 11976 21200 5? 0.049 IV (DCM) reported by
~~ H, duration only
4 minutes.
2 1958-2355 N13E27 2b 11976 22333 13 20.147
4 0620-1000 N14E08 3b 11976 33334 16 >0.456
4 308-1340 N13WO1 sn 11976 10032 6 x
4 2136 - - - 00010 1 x
4 0234-0244 N14W19 sf 11976 00110 2 s Flare-association
may be doubtful.
7 1200-1230 N13W34 1b 11976 11130 6 -
7 1443-1700 N14W36 3b 11976 33333 15** 20,456
10 2306-2314 N11W88 sn 11976 00130 4 0.009
11 1217-1305 N12W90 1b 11976 21131 axe 0.081
il 1315 - - - 00211 4 0.015



COMPREHENSIVE FLARE INDEX FOR "MAJOR" FLARES+, 1970-1974 (continued)

Time (UT) Ha  McMath © Ha Flare Comp. 1-88
Date of Flare Position Imp, Plage Profile Flare Max.X-ray Some remarks i
or Eventtt Number abcde Index Flux (t) (r) ;
1973 i
Apr. 24 1917-2010 N13W06 sb 12322 10132 7** 0.027 }
26 916-2110 N12W36 sn 12322 10112 5 0.086 t
26 — g2300-2318 N1OW33 sn 12322 00012 3 0.005 |
29 0132-0211 N14W65 sn 12322 10130 5 0.014 |
29 0625-0731 N12W65 1b 12322 21130 7 0.050 t
29 0958-113 N12W68 sb 12322 20232 9 ~0.080 ;
29 2056-23 N13W75 2b 12322 32334 15** 0.170 |
May 1 0243-0251 N12W90 sb 12322 30332 11** 0.209 CLG Radioheliograph |
puts source 2Ro |
beyond NW Limb. |
1 gi825-1853 S14E74 sf 12336 10110 3 0.004 |
1 2110) - - - 10123 7** - |
3 0145-0236 S14E54 sn 12336 20200 4 0.029 |
3 0444) - - : 00132 6% - i
3 0830-0915 S14E51 2b 12336 32334 15** 0.209
5 1655-1830 S15E20 2b 12336 32230 10? >0.375 IV is DCM only (H),
duration only 9 minutes.
10 (1240) - - - 00030 3 -
13 (2234) - - - 10031 5? 0.004 IV (M & DKM-BO), re-
ported as Is and
cont. (M) by CLG.
7 1908-1927 NO7ES3 In 12352 21113 8 >0.010
18 1525-1558 NO7E42 1b 12352 21113 8 >0.022
18 2301-2307 NO8E37 sf
gvand/or 12352 00032 5 0.003 IV (DKM-BO), reported
19 0003-0038 NO6GE29 sn as Is and cont. at

M-A by CLG and H.
19 2233-2330 N10E19 2b 12352 22333 13** 0.209 IV (160 and 80 MHz)

observed by CLG
Radiohel iograph.

Jun. 10 (0020)* - - - 0-010 1 - No Flare Patrol.
10 (0059) - - - 00010 1 x II also observed by
CLG Radioheliograph.
Source location is
beyond NE Limb (Prob-
ably related to

region 12387), {
10 (0829-1000 N21E85 in |
ggand 12387 01011 3 vs |
0857-1005 N1OE9O 1b) |
16 1419-1510 N13E11 2b 12387 22112 8 0.027 |
26 0038-0300 SO9W27 in 12397 11232 gee ° 20,010 CLG Radioheliograph '
places source of II
and IV at and beyond f
SW Limb,
29 0145-0210 S13W48 sn 12402 00132 6 0.006 With concomitant |
III & V bursts on |
CLG Radioheliograph, |
‘ source locations at
SE Limb and SW Limb. |
29 1512-1527 SO8E74 sb 12414 10112 5 0.011
29  g1906-197 S08E71 sn 12414 00012 3 - |
i
dul, 4 0201-0238 SO8E12 In 12414 01132 Tee 0.004 IV (160 and 80 MHz) |
observed by CLG if
Radiohel iograph.
7 0415-0449 S08W32 sn 12414 00010 1 s
8 1819-1835 SO6W53 sf 12414 00010 1 -
15 2330 - - - 00030 3** 7
16 (0022) - - - 00010 1 x Previous IV (M & DKM)
is still in progress
18 0217-0303 N14W46 sn 12431 00032 See - IV (160 and 80 MHz)

observed by CLG
Radioheliograph.