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91-09-21.DLY
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1991-09-21
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DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
21 SEPTEMBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 21 SEPTEMBER
-------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 264, 09/21/91
10.7 FLUX=176.6 90-AVG=203 SSN=173 BKI=1233 1101 BAI=006
BGND-XRAY=B9.2 FLU1=1.1E+05 FLU10=9.0E+03 PKI=2222 2221 PAI=006
BOU-DEV=009,017,020,023,006,005,003,009 DEV-AVG=011 NT SWF=00:000
XRAY-MAX= C2.6 @ 1810UT XRAY-MIN= B7.4 @ 0307UT XRAY-AVG= C1.2
NEUTN-MAX= +003% @ 0720UT NEUTN-MIN= -001% @ 2335UT NEUTN-AVG= +0.2%
PCA-MAX= +0.2DB @ 2355UT PCA-MIN= -0.3DB @ 2205UT PCA-AVG= +0.1DB
BOUTF-MAX=55319NT @ 1357UT BOUTF-MIN=55294NT @ 1744UT BOUTF-AVG=55307NT
GOES7-MAX=P:+108NT@ 1906UT GOES7-MIN=N:-022NT@ 0758UT G7-AVG=+073,+046,+004
GOES6-MAX=P:+123NT@ 2212UT GOES6-MIN=E:-009NT@ 0601UT G6-AVG=+083,+001,+023
FLUXFCST=STD:182,185,185;SESC:180,180,180 BAI/PAI-FCST=010,010,010/012,012,012
KFCST=2333 3322 2333 3322 27DAY-AP=012,029 27DAY-KP=2323 3333 3343 2554
WARNINGS=
ALERTS=
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity became a little more interesting today with the
occurrence of an optically uncorrelated long-duration class C2 x-ray event at
17:35 UT. The slow rise to a maximum which was observed with this event is
characteristic of limb events. A possible source lies just beyond the east
limb. The official duration of this event was 3 hours and 26 minutes,
although xrays remained enhanced and continued a gradual decline to
background levels for six hours following the onset of the event.
Also of interest was an eruptive prominence which was observed near
N12E90 reaching approximately 0.15 solar radii between 13:59 UT and 15:15 UT.
This eruptive prominence is visible in the full-disk H-alpha image from
Boulder.
Three new regions were numbered today: Region 6844 (S12E02), 6845
(N07E46) and Region 6846 (S22W25).
Solar activity should continue low. Occassional C-class subflaring
should be observed in Regions 6832 (N08W41) and 6844. There is also a slight
risk for an increase in solar activity and in solar indices over the next
several days if new regions appear on the east limb, as may occur given
recent evidence.
Geomagnetic activity has been mostly quiet to unsettled today. Similar
conditions are anticipated over the next 72 hours. Auroral activity has
likewise been dormant and should continue dormant.
HF propagation conditions have been normal to above normal. Notable
increases in MUF of as high as 25 to 30 percent above seasonal norms were
observed over many regions today. Conditions should remain stable for at
least the next 72 hours.
** End of Daily Update **