From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Summary of Solar Geophysical Activity for 28 August
Apparently-To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
Organization: University of Lethbridge
Date: Sat, 29 Aug 1992 19:18:39 GMT

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                 DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY

                               28 AUGUST, 1992

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                  (Based In-Part On SESC Observational Data)


SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 28 AUGUST
----------------------------------------------------

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 241, 08/28/92
10.7 FLUX=095.7  90-AVG=124        SSN=048      BKI=2211 1011  BAI=003
BGND-XRAY=B1.2     FLU1=3.3E+05  FLU10=1.5E+04  PKI=2211 2212  PAI=006
  BOU-DEV=014,017,005,005,005,003,005,007   DEV-AVG=007 NT     SWF=00:000
 XRAY-MAX= C1.5   @ 2359UT    XRAY-MIN= B1.0   @ 1305UT   XRAY-AVG= B2.3
NEUTN-MAX= +004%  @ 1120UT   NEUTN-MIN= -001%  @ 2125UT  NEUTN-AVG= +1.0%
  PCA-MAX= +0.2DB @ 1315UT     PCA-MIN= -0.2DB @ 0855UT    PCA-AVG= -0.0DB
BOUTF-MAX=55447NT @ 0006UT   BOUTF-MIN=55402NT @ 1752UT  BOUTF-AVG=55436NT
GOES7-MAX=E:+337NT@ 1503UT   GOES7-MIN=N:-001NT@ 0154UT  G7-AVG=+086,+040,+007
GOES6-MAX=P:+124NT@ 2227UT   GOES6-MIN=E:-012NT@ 1759UT  G6-AVG=+104,-006,+027
 FLUXFCST=STD:100,105,110;SESC:100,105,110 BAI/PAI-FCST=005,005,010/010,010,010
    KFCST=2223 3222 2223 3222  27DAY-AP=009,006   27DAY-KP=3312 2322 2202 1222
 WARNINGS=
   ALERTS=
!!END-DATA!!


SYNOPSIS OF ACTIVITY
--------------------

     Solar activity became low today.  The most energetic event observed was
a fairly significant long-duration class C1.5 x-ray event that appears to be
correlated with an eruptive prominence on the east limb in the vicinity of
old returning Region 7248.  The event began near 22:11 UT and is in progress
at the time of this writing.  The preliminary maximum occurred near 00:18 UT
on 29 August.  More details will be provided tommorrow.

     Aside from the above C-class event, only a few other small B-class
flares were observed.  All of these events originated from Region 7268
(N05W63).  This region is presently small, but is gradually growing in size.
A compact area of plage accompanies this region.  Further slow growth is
anticipated.

     Region 7267 (N02W02) is also growing slowly but has remained quiet.

     Old Region 7248 should become visible over the next 24 hours.  Surging
near S10 was observed today with two eruptive prominences noted; one near N03
and the other near S06.  Both of these eruptive events were observed after
21:00 UT.

     Solar activity will be low on 29 August and low to very low on 30
August.  Region 7268 and the unseen area responsible for todays eruptive east
limb activity are the primary candidates for C-class activity.

     The geomagnetic field became quiet today.  The field should continue
mostly quiet over the next 72 hours.

     HF propagation conditions were near-normal to slightly below normal over
most regions.  Similar conditions are expected over the next 72 hours.


COPIES OF JOINT USAF/NOAA SESC SOLAR GEOPHYSICAL REPORTS
========================================================

REGIONS WITH SUNSPOTS (LOCATIONS VALID AT 28/2400Z)
---------------------------------------------------
NMBR LOCATION  LO  AREA  Z   LL   NN MAG TYPE
7267  N02W02  115  0050 DSO  06  017 BETA
7268  N05W63  176  0050 CAO  08  011 BETA
7265  S19W54  167                    PLAGE
7266  N12W26  139                    PLAGE
REGIONS DUE TO RETURN 29 AUGUST TO 31 AUGUST
NMBR LAT    LO
7248 S13   027


LISTING OF SOLAR ENERGETIC EVENTS FOR 28 AUGUST
-----------------------------------------------
BEGIN  MAX  END  RGN   LOC   XRAY  OP 245MHZ 10CM   SWEEP SWF
 0847 0850 0853 7268  N03W53 B3.7  SF    520


POSSIBLE CORONAL MASS EJECTION EVENTS FOR 28 AUGUST
---------------------------------------------------
           UT TIME                 OPTICAL          XRAY    RADIO
 BEGIN        MAX      END     LOCATION   TYPE   SIZE  DUR  II IV
28/B2114             A2151       N03E90   EPL
28/B2134             A2240       S06E90   EPL


INFERRED CORONAL HOLES (LOCATIONS VALID AT 28/2400Z)
----------------------------------------------------
               ISOLATED HOLES AND POLAR EXTENSIONS
      EAST   SOUTH  WEST   NORTH  CAR  TYPE  POL  AREA   OBSN
52   N16E72 S32E49 N04E29 N24E43  062  ISO   POS   016 10830A


**  End of Daily Report  **
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