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91-10-07.DLY
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1991-10-07
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/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
07 OCTOBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 07 OCTOBER
-----------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 280, 10/07/91
10.7 FLUX=180.2 90-AVG=198 SSN=163 BKI=5444 4333 BAI=025
BGND-XRAY=C1.3 FLU1=6.2E+05 FLU10=7.4E+03 PKI=5444 3332 PAI=024
BOU-DEV=095,050,064,043,040,038,027,029 DEV-AVG=048 NT SWF=00:000
XRAY-MAX= C9.9 @ 1018UT XRAY-MIN= C1.1 @ 2359UT XRAY-AVG= C1.6
NEUTN-MAX= +004% @ 0450UT NEUTN-MIN= -003% @ 2240UT NEUTN-AVG= +0.2%
PCA-MAX= +0.1DB @ 1215UT PCA-MIN= -0.2DB @ 2355UT PCA-AVG= -0.1DB
BOUTF-MAX=55326NT @ 0423UT BOUTF-MIN=55281NT @ 1752UT BOUTF-AVG=55305NT
GOES7-MAX=P:+144NT@ 1914UT GOES7-MIN=N:-030NT@ 0504UT G7-AVG=+086,+058,+009
GOES6-MAX=P:+152NT@ 2014UT GOES6-MIN=E:-031NT@ 0954UT G6-AVG=+091,-003,+027
FLUXFCST=STD:174,163,160;SESC:170,160,160 BAI/PAI-FCST=020,015,015/020,018,015
KFCST=4444 3332 3334 4333 27DAY-AP=019,010 27DAY-KP=4224 4332 2222 3222
WARNINGS=*MAJFLR;*AURMIDWCH
ALERTS=**245STRM:1030-1534
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity was low today. Region 6850 (S12W82) became modestly
active today, producing a class C9.9/SF flare at 10:18 UT. A limb spray
event out to 0.13 solar radii was also observed from this region at 14:50 UT.
Region 6861 (N07W34) became a slightly stronger threat today after
developing a sheared delta configuration in the trailer spot complex. It is
now capable of M-class flare production. This region managed to spawn a
class C8/SN event at 15:31 UT, but has not yet produced anything more
energetic.
Two new solar regions were assigned today. Region 6867 (N19W04) and
6868 (S33W57) are both small and relatively unimpressive regions at this
time.
Regions 6850 and 6853 will rotate out of view over the next 24 hours.
The leader spots of Region 6850 were too near to the limb today to discern
any significant optical or magnetic data. However, this region of the Sun is
still large and complex and may be capable of producing an M-class flare
before rotating out of x-ray range. Region 6861 is the next largest threat
and may produce frequent C-class to occassional isolated M-class events.
There is no longer a strong threat for potential proton or PCA activity from
departing Regions 6850/6853.
Geomagnetic activity today ranged from active to minor storm levels.
The activity is most likely the result of a well placed coronal hole. The
hole will be rotating out of influential range over the next 24 hours, which
should reduce geomagnetic activity to mostly unsettled levels by 09 October.
HF propagation conditions were normal to slightly below normal over most
low and middle latitude regions. Conditions should return to near normal or
possibly above normal after 09 October.
** End of Daily Update **