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91-09-20.DLY
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1991-09-20
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DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
20 SEPTEMBER, 1991
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(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 20 SEPTEMBER
-------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 263, 09/20/91
10.7 FLUX=169.7 90-AVG=202 SSN=141 BKI=2423 2211 BAI=009
BGND-XRAY=B8.1 FLU1=2.0E+05 FLU10=9.1E+03 PKI=2333 3221 PAI=010
BOU-DEV=011,050,019,027,018,016,005,007 DEV-AVG=019 NT SWF=00:000
XRAY-MAX= C3.2 @ 1452UT XRAY-MIN= B7.3 @ 1855UT XRAY-AVG= C1.1
NEUTN-MAX= +002% @ 1930UT NEUTN-MIN= -002% @ 1055UT NEUTN-AVG= +0.1%
PCA-MAX= +0.5DB @ 1205UT PCA-MIN= -0.3DB @ 2150UT PCA-AVG= +0.1DB
BOUTF-MAX=55316NT @ 0501UT BOUTF-MIN=55270NT @ 1739UT BOUTF-AVG=55301NT
GOES7-MAX=P:+095NT@ 2001UT GOES7-MIN=N:-005NT@ 0429UT G7-AVG=+071,+047,+005
GOES6-MAX=P:+107NT@ 2140UT GOES6-MIN=E:-011NT@ 0542UT G6-AVG=+083,+002,+023
FLUXFCST=STD:170,170,170;SESC:170,170,170 BAI/PAI-FCST=010,010,010/012,012,012
KFCST=2333 3322 2333 3322 27DAY-AP=014,012 27DAY-KP=4322 3332 2323 3333
WARNINGS=
ALERTS=
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Very little notable activity occurred today. Only a few small low-level
C-class subflares were observed. No limb activity has been observed yet.
Region 6832 (N08W26) is the only moderately complex region capable of
producing notable minor C-class events. It does not appear to be capable of
spawning any M-class flares. The entire visible solar disk is stable and
remarkably dormant.
Two new regions were assigned today: Region 6842 (S12E65) and Region
6843 (N05W66).
Geomagnetic activity has been mostly quiet to unsettled. A few brief
and isolated periods of minor storming were observed over a few high latitude
regions. Conditions will remain mostly quiet to unsettled. Auroral activity
has been dormant.
HF propagation conditions have been normal to slightly above normal in
some regions. All regions should continue to observe normal propagation
conditions.
** End of Daily Update **