From: oler@rho.uleth.ca (Cary Oler)
Subject: Daily Summary of Solar Geophysical Activity for 12 September
Apparently-To: sci-space-news@ames.arc.nasa.gov
Followup-To: sci.space
Organization: University of Lethbridge
Date: Sun, 13 Sep 1992 09:15:17 GMT

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                 DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY

                              12 SEPTEMBER, 1992

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                  (Based In-Part On SESC Observational Data)


SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 12 SEPTEMBER
-------------------------------------------------------

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 256, 09/12/92
10.7 FLUX=117.3  90-AVG=124        SSN=103      BKI=2211 1112  BAI=004
BGND-XRAY=B2.4     FLU1=2.3E+05  FLU10=1.1E+04  PKI=3223 3322  PAI=009
  BOU-DEV=017,011,009,008,006,006,005,011   DEV-AVG=009 NT     SWF=00:000
 XRAY-MAX= C5.2   @ 1544UT    XRAY-MIN= B2.1   @ 2018UT   XRAY-AVG= B3.7
NEUTN-MAX= +001%  @ 2130UT   NEUTN-MIN= -003%  @ 1510UT  NEUTN-AVG= -0.4%
  PCA-MAX= +0.2DB @ 1455UT     PCA-MIN= -0.1DB @ 2205UT    PCA-AVG= +0.0DB
BOUTF-MAX=55440NT @ 1311UT   BOUTF-MIN=55403NT @ 1710UT  BOUTF-AVG=55429NT
GOES7-MAX=P:+112NT@ 1854UT   GOES7-MIN=N:+001NT@ 0123UT  G7-AVG=+088,+045,+011
GOES6-MAX=P:+119NT@ 2135UT   GOES6-MIN=E:-008NT@ 0731UT  G6-AVG=+100,+005,+037
 FLUXFCST=STD:115,115,115;SESC:115,115,115 BAI/PAI-FCST=020,015,010/025,030,015
    KFCST=3455 4444 2344 5322  27DAY-AP=010,005   27DAY-KP=2243 2222 1111 1221
 WARNINGS=*SWF
   ALERTS=
!!END-DATA!!


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

     Solar activity became low.  Region 7276 (N15E13) continued to produce
occasional C-class activity, but was otherwise rather quiet.  The group
continues to possess a beta-gamma-delta magnetic configuration and has not
changed much in structure over the last 24 hours.  Minor M-class flare
activity remains possible from this spot group.

     Two new regions were assigned: Regions 7281 (N12W46) and 7282 (S18W19).
Both are simple and small at the present time.

     Solar activity should be mostly low to moderate.  Minor M-class flare
activity is possible in Region 7276.  The rest of the visible regions are
capable of producing nothing more energetic than minor C-class flares.

     The geomagnetic field was generally quiet.  Unsettled conditions were
dominant over the higher latitudes.  The field is expected to become mostly
active over the next 48 hours due to a well placed coronal hole.  Periods of
minor storming could accompany this disturbance, particularly over the higher
latitude regions.

     HF propagation conditions were near-normal over the low and middle
latitude regions.  High latitudes observed improvements in signal quality
throughout the day, but remained below normal.  MUFs are still depressed by
between 15 and 30 percent.  Propagation is expected to become somewhat
unstable again from the polar to northerly middle latitude signal paths due
to the anticipated coronal hole disturbance noted above.  Conditions should
become generally poor over the high and polar latitude signal paths, mostly
good to fair over the middle latitudes, and good over the low latitudes.
Conditions should rebound again to near-normal by 15 September.


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

REGIONS WITH SUNSPOTS (LOCATIONS VALID AT 12/2400Z)
---------------------------------------------------
NMBR LOCATION  LO  AREA  Z   LL   NN MAG TYPE
7276  N15E13  262  0210 EAI  11  034 BETA-GAMMA
7279  S07E19  256  0000 AXX  00  001 ALPHA
7280  S13E56  219  0100 CSO  11  005 BETA
7281  N12W46  321  0010 BXO  05  006 BETA
7282  S18W19  294  0020 CRO  06  007 BETA
7277  S11W24  299                    PLAGE
7278  N11W31  306                    PLAGE
REGIONS DUE TO RETURN 13 SEPTEMBER TO 15 SEPTEMBER
NMBR LAT    LO
7268 N05   176


LISTING OF SOLAR ENERGETIC EVENTS FOR 12 SEPTEMBER
--------------------------------------------------
BEGIN  MAX  END  RGN   LOC   XRAY  OP 245MHZ 10CM   SWEEP SWF
NO EVENTS OBSERVED


POSSIBLE CORONAL MASS EJECTION EVENTS FOR 12 SEPTEMBER
------------------------------------------------------
           UT TIME                 OPTICAL          XRAY    RADIO
 BEGIN        MAX      END     LOCATION   TYPE   SIZE  DUR  II IV
12/ 0632     0639     0804       N17E26   LDE    C1.7   92


INFERRED CORONAL HOLES (LOCATIONS VALID AT 12/2400Z)
----------------------------------------------------
               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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