home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Shareware Overload
/
ShartewareOverload.cdr
/
database
/
bcast100.zip
/
SGDBS.ZIP
/
91-09-28.DLY
< prev
next >
Wrap
Text File
|
1991-09-28
|
4KB
|
81 lines
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
28 SEPTEMBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 28 SEPTEMBER
-------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 271, 09/28/91
10.7 FLUX=175.6 90-AVG=201 SSN=227 BKI=4434 5343 BAI=025
BGND-XRAY=B8.7 FLU1=3.2E+06 FLU10=8.9E+03 PKI=4444 4454 PAI=033
BOU-DEV=053,059,039,048,071,039,051,028 DEV-AVG=048 NT SWF=00:000
XRAY-MAX= C4.4 @ 2356UT XRAY-MIN= B8.2 @ 1626UT XRAY-AVG= C1.1
NEUTN-MAX= +002% @ 1150UT NEUTN-MIN= -003% @ 1630UT NEUTN-AVG= -0.2%
PCA-MAX= +0.7DB @ 1430UT PCA-MIN= +0.2DB @ 2355UT PCA-AVG= +0.3DB
BOUTF-MAX=55317NT @ 0154UT BOUTF-MIN=55256NT @ 1833UT BOUTF-AVG=55289NT
GOES7-MAX=E:+115NT@ 0522UT GOES7-MIN=N:-044NT@ 1113UT G7-AVG=+068,+061,+001
GOES6-MAX=P:+108NT@ 2017UT GOES6-MIN=E:-021NT@ 0503UT G6-AVG=+079,+004,+025
FLUXFCST=STD:180,180,175;SESC:174,172,170 BAI/PAI-FCST=020,020,020/028,025,030
KFCST=4556 5433 4555 4433 27DAY-AP=035,021 27DAY-KP=4565 4322 1344 4333
WARNINGS=*MAJFLR;*GSTRM;*AURMIDWCH
ALERTS=**MINSTRM
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity remained low today. Region 6850 (S11E30) remains large
and threatening. No signs of decay were observed in this region. It still
possesses a potent beta-gamma-delta configuration. Despite this, flare
output remained uncharacteristically low. Only a few minor C-class flares
were observed early in the UT day. Since then, the region has been quiet.
New Region 6855 (N17E61) produced frequent subflares late in the UT day.
This region is fairly small, but is bright in H-alpha images. Further minor
flares from this region are likely to be observed.
Two other new regions were numbered today: Region 6856 (S29W67) and
6857 (N11W38).
A large solar filament oriented in a north-south direction centered near
N02E16 disappeared sometime between 00 and 12 UT. This event could have a
minor terrestrial impact on 01 October.
Region 6850 remains the most threatening region on the disk. It is
capable of producing very energetic events. However, persistence would
indicate that most of the activity from this region will remain small until
something perturbs the configuration of the region. At the present time,
there does not appear to be anything which is likely to alter the present
configuration, which is obviously fairly stable despite the high magnetic
gradients and mixture of polarities which exist. The potential for proton
flares capable of influencing the Earth are increasing steadily as this
region moves toward the center of the disk. A warning for potential proton
activity (and related events) may be issued shortly.
Geomagnetic activity today ranged from quiet to minor storm levels.
Storm activity has been decreasing throughout the UT day. Conditions may
become mostly unsettled to active before effects from recent filament
disappearances begin to elevate geomagnetic and auroral activity levels
again.
HF propagation conditions have been normal to below normal today. Low
and middle latitude regions observed mostly normal to slightly below normal
propagation conditions, while high latitudes continued to suffer poor to very
poor propagation conditions as a result of continued geomagnetic storming and
slightly elevated PCA levels. Conditions over the high latitude regions may
show some improvement over the next 24 hours, unless enhancements in storm
activity from recent filament disappearances begin to affect the Earth. A
return to mostly poor propagation levels is expected on 01 October as we
experience effects from todays large filament eruption.
** End of Daily Update **