From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Summary of Solar Geophysical Activity for 28 July
Apparently-To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
Organization: University of Lethbridge
Date: Wed, 29 Jul 1992 03:17:28 GMT

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                  DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY

                                28 JULY, 1992

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                  (Based In-Part On SESC Observational Data)


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

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 210, 07/28/92
10.7 FLUX=095.6  90-AVG=126        SSN=066      BKI=4432 2212  BAI=012
BGND-XRAY=B1.3     FLU1=9.5E+04  FLU10=1.1E+04  PKI=4543 3333  PAI=022
  BOU-DEV=052,060,030,018,015,015,008,010   DEV-AVG=026 NT     SWF=00:000
 XRAY-MAX= B4.1   @ 2138UT    XRAY-MIN= B1.2   @ 2207UT   XRAY-AVG= B1.4
NEUTN-MAX= +004%  @ 0410UT   NEUTN-MIN= -001%  @ 2305UT  NEUTN-AVG= +0.5%
  PCA-MAX= +0.1DB @ 1240UT     PCA-MIN= -0.2DB @ 2215UT    PCA-AVG= -0.0DB
BOUTF-MAX=55249NT @ 0006UT   BOUTF-MIN=55202NT @ 1658UT  BOUTF-AVG=55229NT
GOES7-MAX=E:+128NT@ 0533UT   GOES7-MIN=N:-020NT@ 0413UT  G7-AVG=+075,+058,+007
GOES6-MAX=P:+141NT@ 0002UT   GOES6-MIN=E:-009NT@ 1545UT  G6-AVG=+087,+011,+039
 FLUXFCST=STD:098,100,100;SESC:100,100,100 BAI/PAI-FCST=010,010,010/015,015,010
    KFCST=2234 3222 2234 3222  27DAY-AP=016,020   27DAY-KP=3332 3334 3554 2223
 WARNINGS=
   ALERTS=
!!END-DATA!!


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

     Solar activity was very low today.  The solar disk was almost entirely
devoid of flare activity.  The largest event of the day was a B4.1 event at
21:38 UT.

     Region 7238 (S21E18) is exhibiting very slow decay.  C-class flare
activity is possible from this group.

     Region 7242 (N18E56) appears to be a simple, unimpressive unipolar
H-type spot.

     No new regions were assigned today.

     Solar activity is expected to continue very low to low.  Region 7238 has
the best potential for producing weak C-class flare activity.  No other
regions appear capable of producing anything more substantial than weak B
class subflares.

     The geomagnetic field was generally unsettled.  The field became active
with numerous reports of minor storm activity (particularly over the high
latitude regions) between 00:00 UT and 09:00 UT.  A clear solar source for
this disturbance is not apparent.  Activity quieted as the day progressed.
The field is expected to be mostly quiet to unsettled over the next 72 hours.

     Levels of auroral activity were briefly enhanced between 03:00 UT and
08:00 UT.  Activity was sighted as far south as Gore Bay in Ontario (Canada)
near 46 degrees geographic latitude.  Further west, activity was sighted at
Broadview, Saskatchewan (Canada) near 50 degrees geographic latitude.  No
significant equatorward migration of the auroral oval was associated with
this disturbance.  Most of the activity was diffuse with a few brief bursts
of slightly more energetic weak curtain activity.  Auroral activity is
expected to become generally dormant over the next 24 to 72 hours, with
visible activity primarily limited to the high latitude regions.

     HF propagation conditions were near-normal over all regions.  Minor
signal degradation was confined to the high and polar latitude signal paths
between 00:00 UT and 12:00 UT due to isolated minor substorm activity.  All
other regions retained near-normal propagation.  The ionosphere is expected
to remain relatively weak with near-normal propagation and slightly below
normal MUFs 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
7232  N16W91  254  0100 CAO  04  005 BETA
7238  S21E18  145  0180 CAO  10  007 BETA
7240  S13W33  196  0010 HRX  01  002 ALPHA
7241  N15E43  120  0070 HSX  02  001 ALPHA
7242  N18E56  107  0170 HSX  02  001 ALPHA
7236  N18W84  247                    PLAGE
7239  S13W62  225                    PLAGE
REGIONS DUE TO RETURN 29 JULY TO 31 JULY
NMBR LAT    LO
7231 N03   041


LISTING OF SOLAR ENERGETIC EVENTS FOR 28 JULY
---------------------------------------------
BEGIN  MAX  END  RGN   LOC   XRAY  OP 245MHZ 10CM   SWEEP SWF
NO EVENTS OBSERVED


POSSIBLE CORONAL MASS EJECTION EVENTS FOR 28 JULY
-------------------------------------------------
           UT TIME                 OPTICAL          XRAY    RADIO
 BEGIN        MAX      END     LOCATION   TYPE   SIZE  DUR  II IV
NO EVENTS OBSERVED


INFERRED CORONAL HOLES (LOCATIONS VALID AT 28/2400Z)
----------------------------------------------------
               ISOLATED HOLES AND POLAR EXTENSIONS
      EAST   SOUTH  WEST   NORTH  CAR  TYPE  POL  AREA  OBSN
                 NO DATA AVAILABLE FOR ANALYSIS


**  End of Daily Report  **
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