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91-09-10.DLY
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1991-11-18
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DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
10 SEPTEMBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 10 SEPTEMBER
-------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 253, 09/10/91
10.7 FLUX=184.6 90-AVG=203 SSN=180 BKI=5643 3333 BAI=028
BGND-XRAY=C1.4 FLU1=1.3E+05 FLU10=8.6E+03 PKI=5652 3423 PAI=032
BOU-DEV=115,126,048,022,030,025,026,026 DEV-AVG=052 NT SWF=02:018
XRAY-MAX= M2.9 @ 2111UT XRAY-MIN= C1.2 @ 0116UT XRAY-AVG= C2.9
NEUTN-MAX= +004% @ 1235UT NEUTN-MIN= -002% @ 1450UT NEUTN-AVG= +0.5%
PCA-MAX= +0.0DB @ 2015UT PCA-MIN= -0.2DB @ 2345UT PCA-AVG= -0.1DB
BOUTF-MAX=55359NT @ 0256UT BOUTF-MIN=55280NT @ 1744UT BOUTF-AVG=55316NT
GOES7-MAX=E:+166NT@ 0351UT GOES7-MIN=N:-028NT@ 0701UT G7-AVG=+072,+082,+006
GOES6-MAX=P:+145NT@ 2301UT GOES6-MIN=E:-017NT@ 0532UT G6-AVG=+080,+007,+032
FLUXFCST=STD:193,200,210;SESC:195,200,210 BAI/PAI-FCST=030,020,020/040,040,030
KFCST=4565 5443 4565 5443 28DAY-AP=018,038 28DAY-KP=1112 3445 5554 4444
WARNINGS=*MAJFLR;*PROTON;*PCA;*GSTRM;*AURMIDWRN;*AURLOWWCH
ALERTS=**MINSTRM;**MINFLR:M2.9@2111
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity was moderate. A single optically uncorrelated minor
class M2.9 flare was observed at 21:11 UT. All of the active observing sites
were experiencing cloud cover and were unable to locate this flare optically.
It is possible this flare originated beyond the east limb. It may have also
originated from departing Region 6818 (S13W88).
A loop prominence system was observed earlier in the UT day associated
with a long-duration class C6 x-ray event. The loop system was visible at
N02 from 08:58 UT through to 09:12 UT. The slow rise time of this event is
characteristic of flare events behind the east limb.
Other C-class flare events were also observed today, almost all of which
were optically uncorrelated.
The geomagnetic storming which continued throughout the early part of
the UT day diminished after approximately 09:00 UT to mostly unsettled to
active conditions. Conditions are expected to become a bit more active,
possibly reaching minor storm levels again as we begin to experience the
effects of a well placed coronal hole as well as possible effects from the
X-class flare of 08 September.
HF propagation conditions have been near normal over the low and most
middle latitudes. Conditions should continue near normal over these regions.
High latitudes will continue to observe degraded conditions.
There will continue to be a slight probability for isolated auroral
backscatter on the VHF bands until this activity subsides.
** End of Daily Update **