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91-09-19.DLY
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1991-09-20
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DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
19 SEPTEMBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 19 SEPTEMBER
-------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 262, 09/19/91
10.7 FLUX=172.4 90-AVG=202 SSN=160 BKI=2333 2222 BAI=010
BGND-XRAY=B8.4 FLU1=3.1E+05 FLU10=8.6E+03 PKI=2224 3322 PAI=012
BOU-DEV=018,033,028,039,016,018,013,011 DEV-AVG=022 NT SWF=00:000
XRAY-MAX= C3.4 @ 1057UT XRAY-MIN= B7.8 @ 0445UT XRAY-AVG= B9.4
NEUTN-MAX= +002% @ 1640UT NEUTN-MIN= -002% @ 1840UT NEUTN-AVG= +0.0%
PCA-MAX= +0.5DB @ 1210UT PCA-MIN= -0.1DB @ 2215UT PCA-AVG= +0.1DB
BOUTF-MAX=55316NT @ 0430UT BOUTF-MIN=55281NT @ 1716UT BOUTF-AVG=55303NT
GOES7-MAX=P:+099NT@ 1637UT GOES7-MIN=N:-023NT@ 0935UT G7-AVG=+071,+049,+003
GOES6-MAX=P:+123NT@ 0119UT GOES6-MIN=E:-012NT@ 0532UT G6-AVG=+083,+002,+024
FLUXFCST=STD:172,175,175;SESC:170,170,170 BAI/PAI-FCST=010,010,010/012,012,012
KFCST=2333 3322 2333 3322 27DAY-AP=012,014 27DAY-KP=3222 2332 4322 3332
WARNINGS=
ALERTS=
!!END-DATA!!
** NOTE: Proton Fluence values at 1 and 10 MeV are unofficial estimates.
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity continued at low levels today. The only region capable
of producing any notable minor flares was Region 6832 (N08W12), which has
remained moderately complex in magnetic aspects but has been dormant. It
produced only two small C-class subflares during the UT day. Recent
observations suggest that it may be starting to decay.
The only new regions assigned today were born on the disk. Region 6840
is located at N08E01. Region 6841 is located at S14W08.
It is becoming increasingly apparent that one of the major stable
longitudes of solar activity (an area of the Sun which has previously been
consistently productive) has collapsed or is in the process of reconfiguring.
At the same time, another longitudinal zone appears to be developing as a
potential area for active region development. This is evident in the recent
charts of the 10.7 cm solar radio flux and the sunspot numbers. The
consistent rise to a rotational maximum has failed to materialize with this
present rotation. This has been confirmed by the fairly "flat" level of flux
values observed during this present solar rotation period. The possible
development of another area of active longitudes (presently on the far side
of the Sun) should be confirmed over the next two weeks as these longitudes
begin to return.
Geomagnetic activity remained quiet with a few periods of weak unsettled
activity. Some unexpected periods of minor storming were observed over a few
high latitude stations between 12:00 UT and 18:00 UT. There have been no
identifiable sources for this high latitude activity. Despite the period of
storming over the high latitude regions, most high latitude stations reported
A-indices corresponding to unsettled to slightly active levels (between about
12 and 17) which indicates that the high latitude storming was brief and not
very energetic. Activity is expected to continue mostly quiet to unsettled
over the next 72 hours at least.
Auroral activity increased slightly over the high latitude regions
during the period of observed enhanced high latitude geomagnetic activity.
No significant auroral activity was reported. Lunar phase is now an
inhibitor for auroral observations.
HF propagation conditions were normal to slightly above normal over most
low and middle latitude regions. High latitudes also witnessed normal to
above normal conditions. This trend should continue until the middle to
latter part of next week.
** End of Daily Update **