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91-10-08.DLY
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1991-10-08
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/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
08 OCTOBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 08 OCTOBER
-----------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 281, 10/08/91
10.7 FLUX=179 90-AVG=198 SSN=188 BKI=3455 4444 BAI=030
BGND-XRAY=C1.5 FLU1=3.1E+06 FLU10=8.1E+03 PKI=3455 4553 PAI=036
BOU-DEV=027,052,081,096,044,055,044,042 DEV-AVG=055 NT SWF=00:000
XRAY-MAX= C9.0 @ 1521UT XRAY-MIN= C1.0 @ 0015UT XRAY-AVG= C1.9
NEUTN-MAX= +004% @ 2050UT NEUTN-MIN= -002% @ 0555UT NEUTN-AVG= +0.7%
PCA-MAX= +0.5DB @ 0850UT PCA-MIN= -0.2DB @ 2330UT PCA-AVG= -0.0DB
BOUTF-MAX=55317NT @ 0336UT BOUTF-MIN=55236NT @ 1715UT BOUTF-AVG=55286NT
GOES7-MAX=P:+105NT@ 2100UT GOES7-MIN=N:-018NT@ 0849UT G7-AVG=+071,+053,+004
GOES6-MAX=P:+124NT@ 2045UT GOES6-MIN=E:-026NT@ 0600UT G6-AVG=+079,+000,+024
FLUXFCST=STD:173,175,177;SESC:170,170,180 BAI/PAI-FCST=015,012,010/025,015,015
KFCST=3334 4322 3324 3333 27DAY-AP=010,010 27DAY-KP=2222 3222 2122 3333
WARNINGS=*MAJFLR;*AURMIDWCH
ALERTS=
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity was low today, despite the numerous number of C-class
flares which were observed. The largest flare of the day was a class C9.0/SF
event from Region 6861 (N07W47) at 15:22 UT. Eight other C-class flares were
observed from seven other regions.
Five new regions were numbered today. Two regions which formed on-disk
were Regions 6869 (S09E13) and 6870 (N12E18). Regions 6871 (S11E64), 6872
(N07E74) and 6873 (S23E75) rotated into view today from beyond the east limb.
Aside from Region 6861, the most significant region is Region 6873.
This is the return of old Region 6835, which departed from view about two
weeks ago in a very simple and non-threatening configuration. It now appears
as a Type D or possibly E group with a respectable penumbral mass
encompassing a large leader spot and several nearby trailer spots. It is
unknown at the present time whether this is group is magnetically complex.
The region is too near to the limb for reliable magnetic analysis. Close-up
white-light and H-alpha images of this region are available for FTP.
Associated with Region 6873 was extremely intense Calcium XV emissions
and limb surging. This region, together with Region 6861, could be capable
of producing an M-class flare. However, the majority of activity should be
confined to C-class levels.
The geomagnetic field has been consistently active throughout the day.
High latitude regions reported almost continuous minor storming, particularly
throughout the evening and morning sectors. This activity is attributed to a
well placed coronal hole which is expected to become less influential over
the next 24 to 48 hours.
Auroral activity has been mostly moderate over the high latitude regions
throughout the period. Auroral luminosity has not been particularly high
with this disturbance. Conditions should begin to stabilize over the next 24
hours. Another coronal hole appears to be approaching the central meridian
which may provide further periods of geomagnetic and auroral activity
later this week.
HF propagation conditions were mostly normal today with slightly below
normal propagation over many middle latitude regions. High latitudes were
below normal throughout the day as a result of the geomagnetic storming which
has occurred over these regions. Conditions are expected to improve somewhat
over the next 24 to 48 hours, but may become slightly degraded again later
this week if recent coronal analysis indicates an approaching CM coronal
hole. A more accurate determination will be known tommorrow.
** End of Daily Update **