From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Summary of Solar Geophysical Activity for 13 April
Apparently-To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
Organization: University of Lethbridge
Date: Tue, 14 Apr 1992 06:32:18 GMT

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                  DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY

                                13 APRIL, 1992

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                  (Based In-Part On SESC Observational Data)


SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 13 APRIL
---------------------------------------------------

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 104, 04/13/92
10.7 FLUX=146.3  90-AVG=193        SSN=117      BKI=0232 2021  BAI=005
BGND-XRAY=B4.6     FLU1=1.5E+06  FLU10=7.9E+03  PKI=1222 3222  PAI=008
  BOU-DEV=001,018,024,013,012,003,014,009   DEV-AVG=011 NT     SWF=00:000
 XRAY-MAX= B9.5   @ 0041UT    XRAY-MIN= B4.2   @ 2052UT   XRAY-AVG= B5.1
NEUTN-MAX= +004%  @ 1505UT   NEUTN-MIN= -003%  @ 0615UT  NEUTN-AVG= +0.2%
  PCA-MAX= +0.2DB @ 2300UT     PCA-MIN= -1.1DB @ 1600UT    PCA-AVG= -0.0DB
BOUTF-MAX=55283NT @ 1409UT   BOUTF-MIN=55239NT @ 1810UT  BOUTF-AVG=55268NT
GOES7-MAX=P:+113NT@ 2049UT   GOES7-MIN=N:-040NT@ 0741UT  G7-AVG=+088,+034,+008
GOES6-MAX=P:+129NT@ 2109UT   GOES6-MIN=E:-022NT@ 1921UT  G6-AVG=+100,+001,+025
 FLUXFCST=STD:145,150,150;SESC:145,150,150 BAI/PAI-FCST=015,010,010/015,015,010
    KFCST=3334 3332 3324 4222  27DAY-AP=021,013   27DAY-KP=3233 4444 4432 2222
 WARNINGS=
   ALERTS=
!!END-DATA!!


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

     Solar activity continued very low over the last 24 hours.  No C-class
x-ray activity was observed, although the B9.5 event near 00:41 UT narrowly
missed the C-class category.  Region 7128 (S16E18) continues as the largest
and most complex group visible.  Its simple beta magnetic structure has not
produced any substantial flare activity and is not expected to produce
anything more energetic than minor C-class events.

     Region 7132 (S28E75) was the only new region numbered today.

     The National Solar Observatory at Sacramento Peak reported moderate Ca
XV emission on the southeast limb near S21 today.

     Solar activity is expected to continue at low to very low levels over
the next 24 to 72 hours.  The potential for minor M-class flare activity is
essentially negligible at this time.

     The geomagnetic field has been quiet over the last 24 hours.  The field
is expected to continue at quiet to unsettled levels over the next 2 to 3
days.

     HF propagation conditions were normal over all regions.  High and polar
latitude signal paths experienced minor signal degradation which included
periods of sporadic-E and enhanced absorption during the local early morning
hours between approximately 10:00 UT and 15:00 UT.  This activity may have
been rather isolated in nature, but was reported over North America during
this interval.  No significant changes are expected over the next 72 hours.
Low latitudes can expect mostly very good propagation conditions.  Middle
latitudes should observe good to very good conditions, while high and polar
latitudes are expected to witness generally fair propagation.


**  End of Daily Update  **
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