From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Summary of Solar Geophysical Activity for 27 July
Apparently-To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
Organization: University of Lethbridge
Date: Tue, 28 Jul 1992 03:04:09 GMT

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                  DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY

                                27 JULY, 1992

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                  (Based In-Part On SESC Observational Data)


SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 27 JULY
--------------------------------------------------

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 209, 07/27/92
10.7 FLUX=100.3  90-AVG=126        SSN=070      BKI=1123 1114  BAI=008
BGND-XRAY=B1.5     FLU1=4.7E+05  FLU10=1.2E+04  PKI=3122 2333  PAI=010
  BOU-DEV=005,009,015,025,006,008,008,040   DEV-AVG=014 NT     SWF=00:000
 XRAY-MAX= C3.5   @ 0616UT    XRAY-MIN= B1.2   @ 1832UT   XRAY-AVG= B2.6
NEUTN-MAX= +003%  @ 1925UT   NEUTN-MIN= -002%  @ 2110UT  NEUTN-AVG= +0.6%
  PCA-MAX= +0.1DB @ 1725UT     PCA-MIN= -0.1DB @ 1420UT    PCA-AVG= +0.0DB
BOUTF-MAX=55249NT @ 2350UT   BOUTF-MIN=55191NT @ 1740UT  BOUTF-AVG=55232NT
GOES7-MAX=P:+150NT@ 2052UT   GOES7-MIN=N:-002NT@ 0853UT  G7-AVG=+099,+040,+011
GOES6-MAX=P:+164NT@ 2052UT   GOES6-MIN=E:-015NT@ 1518UT  G6-AVG=+112,+001,+032
 FLUXFCST=STD:103,107,110;SESC:105,110,110 BAI/PAI-FCST=010,010,010/010,010,010
    KFCST=2223 3322 2223 3322  27DAY-AP=048,016   27DAY-KP=6763 3333 3332 3334
 WARNINGS=
   ALERTS=
!!END-DATA!!


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

     Solar activity was low over the last 24 hours.  The largest flare of the
day was a class C3.5 event from Region 7238 (S21E32).  Aside from this, very
little else was observed.

     A prominence erupted from the west limb at N02 between 11:51 UT and
12:04 UT.

     Region 7238 remains the largest spot group visible and has remained
fairly stable in terms of growth over the last 24 hours.  It is presently 190
millionths in a DSO optical configuration.  Magnetically, this group is a
fairly simple beta type group with no signs of increasing complexity.

     New Region 7242 (N17E67) rotated into view today as an apparent unipolar
HSX spot group.  The proximity of this region to the limb inhibited attempts
to determine accurate characteristics, although it appears to be similar in
area to Region 7238.  Analysis over the next couple of days may also reveal a
few small trailer spots.

     Solar activity is expected to continue low to very low.  No significant
activity is expected from any of the regions presently visible.

     The geomagnetic field was generally quiet over the last 24 hours.  There
are signs activity may be trending toward unsettled or mildly active levels.
Between 21:00 UT and 24:00 UT, field became unsettled to mildly active.  The
geomagnetic field is expected to continue mostly unsettled with occasional
active periods over the next 24 hours, particularly over the high latitude
regions.  Activity should be mostly unsettled on 29 and 30 July.

     HF propagation conditions were near-normal over all regions.  Spread-F
continued to degrade propagation over a few regions.  However, overall global
propagation remained near-normal with MUFs near-normal to slightly below
normal.  Night-sector propagation is expected to be slightly less stable
over the next 24 hours than was observed in recent days.  Otherwise,
propagation should continue near-normal over the next 72 hours.


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

REGIONS WITH SUNSPOTS (LOCATIONS VALID AT 27/2400Z)
---------------------------------------------------
NMBR LOCATION  LO  AREA  Z   LL   NN MAG TYPE
7232  N14W80  256  0100 CAO  06  005 BETA
7238  S21E32  144  0190 DSO  10  008 BETA
7240  S14W20  196  0010 BXO  05  005 BETA
7241  N15E55  121  0060 HSX  02  001 ALPHA
7242  N17E67  109  0120 HSX  02  001 ALPHA
7236  N18W71  247                    PLAGE
7239  S13W49  225                    PLAGE
REGIONS DUE TO RETURN 28 JULY TO 30 JULY
NMBR LAT    LO
NONE


LISTING OF SOLAR ENERGETIC EVENTS FOR 27 JULY
---------------------------------------------
BEGIN  MAX  END  RGN   LOC   XRAY  OP 245MHZ 10CM   SWEEP SWF
NO EVENTS OBSERVED


POSSIBLE CORONAL MASS EJECTION EVENTS FOR 27 JULY
-------------------------------------------------
           UT TIME                 OPTICAL          XRAY    RADIO
 BEGIN        MAX      END     LOCATION   TYPE   SIZE  DUR  II IV
27/B1151              1204       N02W90   EPL


INFERRED CORONAL HOLES (LOCATIONS VALID AT 27/2400Z)
----------------------------------------------------
               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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