From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Summary of Solar Geophysical Activity for 07 April
Apparently-To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
Organization: University of Lethbridge
Date: Wed, 8 Apr 1992 06:11:56 GMT

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                  DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY

                                07 APRIL, 1992

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                  (Based In-Part On SESC Observational Data)


SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 07 APRIL
---------------------------------------------------

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 098, 04/07/92
10.7 FLUX=141.5  90-AVG=198        SSN=084      BKI=2444 3221  BAI=015
BGND-XRAY=B5.1     FLU1=7.3E+05  FLU10=1.0E+04  PKI=2453 3322  PAI=019
  BOU-DEV=018,060,049,050,027,019,018,008   DEV-AVG=031 NT     SWF=00:000
 XRAY-MAX= C7.9   @ 1542UT    XRAY-MIN= B4.8   @ 1344UT   XRAY-AVG= C1.1
NEUTN-MAX= +001%  @ 2125UT   NEUTN-MIN= -003%  @ 1210UT  NEUTN-AVG= -0.2%
  PCA-MAX= +0.5DB @ 1450UT     PCA-MIN= -0.3DB @ 1210UT    PCA-AVG= +0.1DB
BOUTF-MAX=55282NT @ 1336UT   BOUTF-MIN=55245NT @ 2018UT  BOUTF-AVG=55269NT
GOES7-MAX=P:+107NT@ 2003UT   GOES7-MIN=N:-038NT@ 0756UT  G7-AVG=+076,+048,+006
GOES6-MAX=P:+120NT@ 2109UT   GOES6-MIN=E:-021NT@ 1803UT  G6-AVG=+087,+009,+029
 FLUXFCST=STD:143,143,145;SESC:140,140,140 BAI/PAI-FCST=010,007,007/018,018,018
    KFCST=3334 4222 2224 4221  27DAY-AP=019,011   27DAY-KP=3435 4332 2333 3222
 WARNINGS=
   ALERTS=
!!END-DATA!!


BRIEF SUMMARY OF EVENTS
-----------------------

     Solar activity continued low.  Several high-level C-class flares were
observed today, the largest of which was a C7.9 event at 15:42 UT.  A class
C7.5/1N flare erupted from Region 7123 (S05E03) at 03:35 UT.  Four other
C-class flares also originated from this region, which has continued to
slowly grow over the last 24 hours.

     Also of interest today was an eruptive prominence observed to 0.17 solar
radii at 17:32 UT.  The location of this eruptive prominence (S19E90) appears
to be near the location where old Region 7119 (S19,L=077) is due to return
over the next 24 to 72 hours.  This region was born on the disk on 26 March
and departed the west limb only two days later on 28 March.  During this
period, the area grew from a small CRO type spot group to an HRX optical
configuration.  Further growth after this region rotated beyond the west limb
probably occurred.  There is therefore a chance this region may return as a
fairly mature spot group if development continued on the far side of the sun.

     Solar activity is expected to continue low.  There is a slight chance
for an isolated low-level M-class flare from Region 7123.  Other than this,
general C-class flare activity should dominate.

     The geomagnetic field ranged from quiet to active levels today with a
few storm-level perturbations observed over the high latitudes between 09:00
UT and 12:00 UT.  The field is expected to continue mostly quiet to unsettled
over the low and middle latitudes with a few active to minor storm periods
remaining possible over the higher latitudes.

     HF propagation conditions were near normal over most regions.  High
latitudes became slightly below normal between approximately 06:00 UT and
12:00 UT.  Some middle latitude signal path instabilities also persisted
during the local night and early morning hours.  Conditions are expected to
continue near normal over all regions.  Low and middle latitudes can expect
very good to good propagation respectively.  High latitudes are expected to
observe mostly fair propagation conditions over the next 24 to 72 hours.


**  End of Daily Update  **
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