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91-09-26.DLY
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1991-09-26
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DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
26 SEPTEMBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 26 SEPTEMBER
-------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 269, 09/26/91
10.7 FLUX=200.6 90-AVG=203 SSN=181 BKI=5466 3333 BAI=036
BGND-XRAY=C2.1 FLU1=4.6E+05 FLU10=9.0E+03 PKI=5455 4344 PAI=036
BOU-DEV=075,050,123,134,036,036,028,037 DEV-AVG=064 NT SWF=03:056
XRAY-MAX= M3.4 @ 1236UT XRAY-MIN= C1.9 @ 1637UT XRAY-AVG= C4.0
NEUTN-MAX= +004% @ 1010UT NEUTN-MIN= -002% @ 2155UT NEUTN-AVG= +0.5%
PCA-MAX= +0.4DB @ 1120UT PCA-MIN= -0.1DB @ 2230UT PCA-AVG= +0.0DB
BOUTF-MAX=55323NT @ 0233UT BOUTF-MIN=55264NT @ 1847UT BOUTF-AVG=55291NT
GOES7-MAX=E:+147NT@ 0611UT GOES7-MIN=N:-046NT@ 0951UT G7-AVG=+078,+068,+001
GOES6-MAX=P:+143NT@ 0001UT GOES6-MIN=E:-028NT@ 0608UT G6-AVG=+088,+007,+028
FLUXFCST=STD:210,218,222;SESC:210,220,225 BAI/PAI-FCST=030,025,020/035,030,025
KFCST=4456 5443 4555 5443 27DAY-AP=036,041 27DAY-KP=3355 4544 5554 4454
WARNINGS=*MAJFLR;*GSTRM;*AURMIDWRN
ALERTS=**MINFLR:M1.6/SF@0717(6853);**MINFLR:M3.4/SN@1236(6853);
**MINFLR:M1.4/1B@2052(6848);**MINSTRM
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity was moderate today. Three M-class flares were observed
from eastern hemisphere regions. New Region 6853 (S19E69) was the most
energetic, producing two of the three M-class events: an M1.6/SF at 07:17 UT,
and a class M3.4/SN at 12:36 UT. Region 6848 (S07E38) produced the other
M-class event, rated a class M1.4/1B flare at 20:52 UT.
Many of the regions in the southeast experienced growth today. Most
notable were Regions 6850, which has a delta configuration and is a potential
site for major flaring, and Region 6848 which is still relatively simple.
Region 6850 has also increased in magnetic complexity and could be capable
of producing major flare activity at any time. This region is large enough
and complex enough to spawn proton flares, although it is still in a very
poor position for producing observable protons in the near-Earth environment
should a major flare erupt. This region only produced a few small subflares
today.
The only other solar event which is worth noting was the disappearance
of a fairly substantial segment of solar filament near N15E47 between 14:51
and 15:12 UT.
Geomagnetic activity ranged from active to major storm levels today.
Conditions were most intense between 08:00 UT and 12:00 UT. The middle
latitude regions appear to have suffered the worst magnetic perturbations,
although many high latitude observatories also reported strong activity.
Similar conditions are expected over the next 24 hours, with a gradual return
to more dormant levels of activity setting in thereafter. Conditions should
become mostly unsettled to active by 29 or 30 September.
Auroral activity was moderate to high over the northerly middle and high
latitude regions during the local evening and early morning hours of 26
September. Despite the high levels of activity, lunar luminosity severely
inhibited attempts to view activity, particularly over the northern
hemisphere regions. Conditions have not been particularly favorable for low
latitude auroral observations. Auroral activity will continue at mostly
moderate to occassionally high levels over some middle and most high latitude
regions over the next 24 hours. Thereafter, a return to generally moderate
levels of activity should be observed.
HF propagation conditions have been below normal over most middle and
high latitude regions over the last 24 hours. Low latitudes have observed
mostly good propagation conditions, but with some increased levels of fading
and flutter. Propagation conditions over the low latitude regions should
remain mostly good to fair, becoming normal by 29 or 30 September. Middle
latitudes should witness mostly good to occassionally poor (particularly
during local evening and early morning hours) conditions, becoming mostly
good to fair by 29 or 30 September. High latitudes will remain generally
poor, but should begin to see an improvement in propagation conditions by 29
or 30 September. However, no solid improvements are expected over the high
latitude regions until early in October.
** End of Daily Update **