From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Summary of Solar Geophysical Activity for 08 April
Apparently-To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
Organization: University of Lethbridge
Date: Thu, 9 Apr 1992 07:23:42 GMT

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                  DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY

                                08 APRIL, 1992

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                  (Based In-Part On SESC Observational Data)


SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 08 APRIL
---------------------------------------------------

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 099, 04/08/92
10.7 FLUX=145.4  90-AVG=196        SSN=078      BKI=2333 3232  BAI=012
BGND-XRAY=B6.1     FLU1=1.2E+06  FLU10=1.0E+04  PKI=3434 4342  PAI=021
  BOU-DEV=017,035,025,027,022,015,029,014   DEV-AVG=023 NT     SWF=00:000
 XRAY-MAX= C5.7   @ 0757UT    XRAY-MIN= B5.2   @ 2332UT   XRAY-AVG= C1.1
NEUTN-MAX= +002%  @ 1450UT   NEUTN-MIN= -002%  @ 2125UT  NEUTN-AVG= -0.0%
  PCA-MAX= +0.3DB @ 1230UT     PCA-MIN= -0.6DB @ 2105UT    PCA-AVG= -0.0DB
BOUTF-MAX=55284NT @ 0402UT   BOUTF-MIN=55239NT @ 1850UT  BOUTF-AVG=55269NT
GOES7-MAX=P:+102NT@ 2039UT   GOES7-MIN=N:-008NT@ 0933UT  G7-AVG=+077,+043,+008
GOES6-MAX=P:+114NT@ 0019UT   GOES6-MIN=E:-020NT@ 1935UT  G6-AVG=+087,+006,+029
 FLUXFCST=STD:145,145,145;SESC:145,145,145 BAI/PAI-FCST=007,007,007/018,018,018
    KFCST=2224 4221 2225 4221  27DAY-AP=011,007   27DAY-KP=2333 3222 2222 2221
 WARNINGS=
   ALERTS=**245STRM:0030-1200UT
!!END-DATA!!


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

     Solar activity was low today.  Region 7123 (S06W10) continued as the
most active and complex region visible.  It produced four C-class flares, the
largest of which was a C5.7/1F event at 07:57 UT.  Very little change was
observed in this region over the last 24 hours, although the region is
producing low-level C-class soft x-ray enhancements that are spanning several
hours in duration.  It remains bipolar and contains a northeast to southwest
neutral line.  Recent imagery from the Japanese Yohkoh satellite have shown
flare loops bridging the neutral line in a nearly east-west direction,
indicating that moderate shear exists in this region.

     The other three numbered solar regions also remained stable.

     New Region 7128 (S15E79) was numbered today.  This region consists of a
large leader spot spanning about 3 degrees in latitude.  Yohkoh imagery does
not show any significant x-ray emissions near this region, implying it is
most likely mature and stable with little plage.

     Solar activity is expected to continue mostly low.  Region 7123 may be
capable of producing an isolated M-class flare.  No significant activity is
expected from any of the regions presently visible.

     The geomagnetic field was quiet to unsettled.  High latitudes continued
to experience a few brief episodes of storm conditions between 12:00 UT and
15:00 UT, but were otherwise generally unsettled to active.  Conditions are
expected to remain mostly quiet to unsettled over the low and middle latitude
regions.  High latitudes can expect mostly unsettled to active conditions
with a few weak and isolated storm periods remaining possible over the next
24 hours.

     HF propagation conditions were normal over all regions.  High latitude
signal paths continued to experience occassional instabilities during the
local night and early morning hours, but were otherwise normal with fair
propagation conditions.  Low and middle latitudes experienced good to very
good propagation conditions.  Normal propagation is expected for the next 24
to 72 hours.  High latitude signal paths can continue to expect occassional
minor degradation during the night and early morning sectors over the path
midpoint due to localized minor high-latitude enhancements in geomagnetic and
auroral activity.


**  End of Daily Update  **