From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Summary of Solar Geophysical Activity for 26 September
Apparently-To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
Organization: University of Lethbridge
Date: Sun, 27 Sep 1992 07:51:47 GMT

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                 DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY

                              26 SEPTEMBER, 1992

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                  (Based In-Part On SESC Observational Data)


SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 26 SEPTEMBER
-------------------------------------------------------

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 270, 09/26/92
10.7 FLUX=116.7  90-AVG=124        SSN=115      BKI=3210 1311  BAI=006
BGND-XRAY=B2.0     FLU1=3.5E+05  FLU10=1.7E+04  PKI=3210 1311  PAI=006
  BOU-DEV=025,019,008,004,009,020,006,005   DEV-AVG=012 NT     SWF=00:000
 XRAY-MAX= C1.8   @ 0128UT    XRAY-MIN= B1.9   @ 1739UT   XRAY-AVG= B3.0
NEUTN-MAX= +004%  @ 1710UT   NEUTN-MIN= -001%  @ 1545UT  NEUTN-AVG= +1.0%
  PCA-MAX= +0.1DB @ 1115UT     PCA-MIN= -0.2DB @ 2050UT    PCA-AVG= -0.0DB
BOUTF-MAX=55435NT @ 1346UT   BOUTF-MIN=55407NT @ 1645UT  BOUTF-AVG=55426NT
GOES7-MAX=P:+111NT@ 1632UT   GOES7-MIN=N:+000NT@ 0158UT  G7-AVG=+081,+033,+010
GOES6-MAX=P:+114NT@ 1627UT   GOES6-MIN=E:-024NT@ 1631UT  G6-AVG=+092,-014,+025
 FLUXFCST=STD:118,115,115;SESC:120,120,120 BAI/PAI-FCST=010,015,015/010,010,015
    KFCST=2135 5111 2123 3111  27DAY-AP=007,007   27DAY-KP=1122 3221 1321 2222
 WARNINGS=
   ALERTS=**245STRM:0138-0847UTC
!!END-DATA!!


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

     Solar activity became low today.  The largest flare of the day was an
optically uncorrelated class C1.8 x-ray event at 01:28 UT.  A second
uncorrelated class C1.4 flare occurred at 01:59 UT.  Both of these events
were impulsive and were likely associated with an eruptive center near the
east limb.

     Region 7295 (N13E68) produced a substantial amount of surging and other
limb activity today.  It has the potential to produce occasional minor
C-class flares.

     New Region 7296 (N07E68) was numbered today.

     Solar activity is expected to continue low to very low.  C-class flare
activity is possible in Region 7295.  The risk for minor M-class flare
activity from one of these eastern hemisphere regions remains small.

     The geomagnetic field was quiet to unsettled with a few active to minor
storm periods observed primarily over the higher latitudes between 15:00 UT
and 18:00 UT.  The field is expected to continue quiet to unsettled on 27
September.  A positive polarity coronal hole will become well placed for
enhancing levels of geomagnetic activity on 28 or 29 September.  Generally
unsettled to active conditions are expected for these days.

     HF propagation conditions were near-normal over all regions.  Similar
conditions should prevail for the next 24 hours.  On 28 or 29 September,
minor enhancements in geomagnetic activity could produce mild signal
degradation over the high and polar latitude signal paths, primarily in the
form of increased fading levels and sporadic periods of increased signal
absorption.


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

REGIONS WITH SUNSPOTS (LOCATIONS VALID AT 26/2400Z)
---------------------------------------------------
NMBR LOCATION  LO  AREA  Z   LL   NN MAG TYPE
7283  S16W76  166  0050 HSX  02  001 ALPHA
7288  S17W61  151  0020 BXO  05  003 BETA
7289  S09W13  103  0210 CAO  05  003 BETA
7291  S09W42  132  0010 BXO  02  002 BETA
7292  N20E21  069  0010 AXX  02  002 ALPHA
7293  S07E25  065  0080 DAO  10  008 BETA
7294  S11E44  046  0240 HHX  03  001 ALPHA
7295  N13E68  022  0100 HSX  02  001 ALPHA
7296  N07E68  022  0020 BXO  03  004 BETA
7285  S08W77  167                    PLAGE
7287  N07W82  172                    PLAGE
7290  N17W75  165                    PLAGE
REGIONS DUE TO RETURN 27 SEPTEMBER TO 29 SEPTEMBER
NMBR LAT    LO
7281 N12   321


LISTING OF SOLAR ENERGETIC EVENTS FOR 26 SEPTEMBER
--------------------------------------------------
BEGIN  MAX  END  RGN   LOC   XRAY  OP 245MHZ 10CM   SWEEP SWF
NO EVENTS OBSERVED


POSSIBLE CORONAL MASS EJECTION EVENTS FOR 26 SEPTEMBER
------------------------------------------------------
           UT TIME                 OPTICAL          XRAY    RADIO
 BEGIN        MAX      END     LOCATION   TYPE   SIZE  DUR  II IV
NO EVENTS OBSERVED


INFERRED CORONAL HOLES (LOCATIONS VALID AT 26/2400Z)
----------------------------------------------------
               ISOLATED HOLES AND POLAR EXTENSIONS
      EAST   SOUTH  WEST   NORTH  CAR  TYPE  POL  AREA   OBSN
56   S24E36 S34E08 S02E05 N08E06  079  ISO   POS   025 10830A
57   N30E46 N15E33 N15E33 N30E46  042  ISO   POS   002 10830A


**  End of Daily Report  **
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