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91-10-20.DLY
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1991-10-21
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/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
20 OCTOBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 20 OCTOBER
-----------------------------------------------------
IMPORTANT NOTICE:
All previous notes regarding abnormal proton levels in the 1 MeV proton range
within the period of 18 to 20 October are incorrect. This includes
statements of proton count rates and fluence levels for the 1 MeV protons.
A possible satellite or computer related problem has been identified and will
be investigated more thoroughly later this UT day (Monday). The 1 MeV proton
data from the GOES-7 spacecraft is at fault. Hopefully this problem will be
rectified shortly.
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 293, 10/20/91
10.7 FLUX=157.2 90-AVG=196 SSN=136 BKI=3443 3432 BAI=018
BGND-XRAY=B8.4 FLU1=*.*E*** FLU10=6.0E+03 PKI=3444 4332 PAI=021
BOU-DEV=035,050,052,033,027,049,023,011 DEV-AVG=035 NT SWF=00:000
XRAY-MAX= C3.5 @ 0257UT XRAY-MIN= B7.9 @ 1530UT XRAY-AVG= C1.0
NEUTN-MAX= +004% @ 2115UT NEUTN-MIN= -003% @ 2155UT NEUTN-AVG= -0.0%
PCA-MAX= +0.6DB @ 1040UT PCA-MIN= -0.3DB @ 0150UT PCA-AVG= +0.0DB
BOUTF-MAX=55310NT @ 0529UT BOUTF-MIN=55256NT @ 1642UT BOUTF-AVG=55287NT
GOES7-MAX=P:+131NT@ 2004UT GOES7-MIN=N:-045NT@ 1130UT G7-AVG=+064,+058,+005
GOES6-MAX=P:+151NT@ 2041UT GOES6-MIN=E:-057NT@ 0740UT G6-AVG=+074,-001,+023
FLUXFCST=STD:161,165,170;SESC:160,162,165 BAI/PAI-FCST=018,018,025/018,015,026
KFCST=3355 4234 4355 4224 27DAY-AP=007,033 27DAY-KP=2112 2222 3443 4455
WARNINGS=
ALERTS=
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity was low today. X-rays have increased in activity notably
over the last 24 hours, although none of the xray bursts have exceeded the
C-class range. Region 6884 (S12W23) was responsible for several minor
subflares today. Region 6879 (N22W14) continued to decay.
Two new regions were numbered today: Region 6886 (N09E43) and 6887
(S19W20).
Solar activity should continue low, with only a slight chance for an
isolated minor M-class flare. Probabilities for increased activity will rise
on 22 or 23 October when several active regions are due to return.
Geomagnetic activity has been unsettled to active today. We are
presently under the influence of a coronal disturbance. A more serious
increase in activity is possible by 22 or 23 October as a recurrent
geoeffective coronal hole becomes capable of influencing geomagnetic and
auroral activity again.
HF propagation conditions have been normal to below normal today.
Increased noise levels and absorption have been noted over most regions.
Similar conditions should persist over the next 24 hours, with a more serious
decline in conditions possible within the next 48 to 72 hours. High and
northerly middle latitude signal paths will be the most heavily affected.
** End of Daily Update **