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91-09-07.DLY
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1991-11-18
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DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
07 SEPTEMBER, 1991
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(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 07 SEPTEMBER
-------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 250, 09/07/91
10.7 FLUX=174.4 90-AVG=205 SSN=147 BKI=4332 3231 BAI=013
BGND-XRAY=C2.7 FLU1=1.6E+07 FLU10=9.4E+04 PKI=4333 3221 PAI=014
BOU-DEV=061,032,028,019,022,019,026,007 DEV-AVG=026 NT SWF=05:155
XRAY-MAX= X3.3 @ 1927UT XRAY-MIN= C1.6 @ 0022UT XRAY-AVG= C7.7
NEUTN-MAX= +005% @ 1705UT NEUTN-MIN= +000% @ 2240UT NEUTN-AVG= +1.9%
PCA-MAX= +1.1DB @ 1935UT PCA-MIN= -1.0DB @ 1755UT PCA-AVG= +0.1DB
BOUTF-MAX=55326NT @ 0240UT BOUTF-MIN=55251NT @ 1929UT BOUTF-AVG=55302NT
GOES7-MAX=P:+101NT@ 1902UT GOES7-MIN=N:-025NT@ 0755UT G7-AVG=+071,+056,+004
GOES6-MAX=P:+109NT@ 1902UT GOES6-MIN=E:-005NT@ 0752UT G6-AVG=+081,+022,+014
FLUXFCST=STD:170,175,185;SESC:170,165,160 BAI/PAI-FCST=015,020,020/020,030,030
KFCST=2234 4344 4445 5444 28DAY-AP=020,052 28DAY-KP=3344 4432 2555 5665
WARNINGS=*MAJFLR;*PROTON;*PCA
ALERTS=**MAJFLR:X3.3/2B,S11W50(6818),1920-1927-1958,II=2@1930,CTM=1@1956;
**TENFLR:280SFU@1920,DUR:11;**MINFLR:M2.1@0753;**MINFLR:M4.1@1007;
**MINFLR:M2.1@1250
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Rapidly developing Region 6818 (S12W52) produced several energetic
flares today. The largest was a class X3.3/2B tenflare with a Type II sweep
at 19:27 UT. At the time of this event, Region 6811 was also in progress
with a flare. The combined x-rays from these two events are responsible for
the high x-ray levels observed at 19:27 UT. A moderate to strong shortwave
fade as observed over the sunlit areas in conjunction with this major flare.
An impressive geomagnetic crochet was also witnessed.
** End of Daily Update **