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91-10-06.DLY
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1991-10-06
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/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
06 OCTOBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 06 OCTOBER
-----------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 279, 10/06/91
10.7 FLUX=182 90-AVG=198 SSN=188 BKI=2224 4445 BAI=022
BGND-XRAY=B9.9 FLU1=1.1E+06 FLU10=1.1E+04 PKI=1123 3545 PAI=022
BOU-DEV=014,016,015,053,054,058,044,103 DEV-AVG=044 NT SWF=00:000
XRAY-MAX= C3.4 @ 0535UT XRAY-MIN= B9.2 @ 1313UT XRAY-AVG= C1.2
NEUTN-MAX= +002% @ 2330UT NEUTN-MIN= -004% @ 1655UT NEUTN-AVG= -0.8%
PCA-MAX= +0.1DB @ 1605UT PCA-MIN= -0.2DB @ 2215UT PCA-AVG= -0.0DB
BOUTF-MAX=55329NT @ 2244UT BOUTF-MIN=55267NT @ 1648UT BOUTF-AVG=55304NT
GOES7-MAX=P:+129NT@ 1619UT GOES7-MIN=N:-012NT@ 2255UT G7-AVG=+083,+046,+007
GOES6-MAX=P:+138NT@ 0020UT GOES6-MIN=E:-028NT@ 0935UT G6-AVG=+091,-004,+026
FLUXFCST=STD:175,170,165;SESC:177,170,160 BAI/PAI-FCST=025,020,015/025,020,018
KFCST=4555 4333 3345 4333 27DAY-AP=032,019 27DAY-KP=5652 3423 4224 4332
WARNINGS=*MAJFLR;*PROTFLR;*PROTON;*PCA;*AURMIDWCH
ALERTS=
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity became low today. No M-class flares were observed. In
fact, the largest event observed was a low-level C-class flare (class
C3.4/SN) from Region 6861 (N08W19). This region has begun to show signs of
decay. It was the most active region on the disk, producing the majority of
small subflares.
Solar Region 6850 (S12W70) is due to rotate off the disk during the UT
day of 08 October. It is no longer well placed for producing terrestrial
impacts. This region entered a more rapid state of decay today. The delta
which formed in the central part of this region dissipated, although a delta
configuration still exists in the leader spot complex of this region. This
region became substantially less threatening today as it began to move out of
influential range. It is still capable of producing potentially strong
proton activity should a proton flare erupt, although the probability for
such an event is notably lower. The entire system appears to have stabilized
from yesterday. It should leave the western limb in a stable, yet optically
impressive state. There remains a slight possibility for a major flare from
this region, although we no longer consider the threat to be as substantial
as it has been over the last several days.
Geomagnetic and auroral activity has increased over the last 12 hours in
response to the well placed coronal hole. Generally active conditions have
been observed, with a few periods of minor storming over the middle and high
latitudes. Periods of minor storming are expected to continue over the next
24 hours. A gradual return to mostly active levels is anticipated by 09
October.
HF propagation conditions were fairly normal over most regions. A
slight amount of degradation may have occurred over some middle and high
latitudes, particularly after 18:00 UT in response to the increases in
geomagnetic and auroral activity. Conditions should begin to improve after
08 or 09 October.
** End of Daily Update **