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91-09-14.DLY
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1991-09-14
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DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
14 SEPTEMBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 14 SEPTEMBER
-------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 257, 09/14/91
10.7 FLUX=181.3 90-AVG=202 SSN=204 BKI=4334 4433 BAI=021
BGND-XRAY=B7.6 FLU1=6.8E+05 FLU10=8.0E+03 PKI=4344 4432 PAI=023
BOU-DEV=040,034,023,052,058,055,024,026 DEV-AVG=039 NT SWF=00:000
XRAY-MAX= C5.3 @ 1349UT XRAY-MIN= B7.0 @ 0537UT XRAY-AVG= B9.1
NEUTN-MAX= +002% @ 2130UT NEUTN-MIN= -004% @ 1300UT NEUTN-AVG= -0.3%
PCA-MAX= +0.2DB @ 0155UT PCA-MIN= -0.3DB @ 2255UT PCA-AVG= -0.0DB
BOUTF-MAX=55321NT @ 0158UT BOUTF-MIN=55271NT @ 1734UT BOUTF-AVG=55303NT
GOES7-MAX=E:+113NT@ 0854UT GOES7-MIN=N:-029NT@ 0937UT G7-AVG=+068,+058,+005
GOES6-MAX=P:+111NT@ 2102UT GOES6-MIN=E:-017NT@ 0751UT G6-AVG=+078,+004,+027
FLUXFCST=STD:180,185,190;SESC:180,185,190 BAI/PAI-FCST=016,010,010/020,015,015
KFCST=3234 5222 2134 4111 28DAY-AP=022,053 28DAY-KP=4322 3354 5576 5433
WARNINGS=
ALERTS=
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity on 14 September was low. Several small C-class flares
were observed during the day, the largest of which was a class C5/1N event
originating from Region 6824 (S20W08). This region, as well as Region 6832
(N06E57) may be capable of spawning an isolated M-class flare, although the
probability is rather low (~ 30% for each region).
The only new region numbered today was Region 6833 (N04W12). This
region is very small and structurally simple at the present time.
Isolated C-class flaring and occassional subflaring can be expected from
the regions currently visible. No limb activity was reported today, which is
consistent with models.
Geomagnetic activity became mostly unsettled to active over the middle
latitude regions today. Some brief low-energy periods of minor storming
were observed over a few high latitude observatories, although nothing
significant was reported. A general trend back toward quiet levels will be
observed over the next several days as the small recurrent effects wane.
Auroral activity increased very slightly over the high and northerly
middle latitude regions on 14 September. Stabilization will set in over the
next 24 to 48 hours, bringing levels of auroral activity back to dormancy.
HF propagation conditions have been good to very good over the
equatorial to middle latitudes. High latitudes experienced mostly fair
propagation conditions. Conditions will continue to improve over the high
latitude regions this coming week. Generally normal to above normal
propagation conditions are forecasted for the next seven days.
** End of Daily Update **