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91-09-08.DLY
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1991-11-18
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DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
08 SEPTEMBER, 1991
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(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 08 SEPTEMBER
-------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 251, 09/08/91
10.7 FLUX=196.1 90-AVG=204 SSN=194 BKI=4434 3333 BAI=019
BGND-XRAY=C3.2 FLU1=1.6E+06 FLU10=1.3E+04 PKI=4324 4443 PAI=023
BOU-DEV=052,057,030,051,036,037,029,022 DEV-AVG=039 NT SWF=06:177
XRAY-MAX= X1.0 @ 0912UT XRAY-MIN= C2.6 @ 1524UT XRAY-AVG= C7.2
NEUTN-MAX= +005% @ 2110UT NEUTN-MIN= +000% @ 2225UT NEUTN-AVG= +1.8%
PCA-MAX= +0.1DB @ 0305UT PCA-MIN= -0.8DB @ 2015UT PCA-AVG= -0.1DB
BOUTF-MAX=55324NT @ 2314UT BOUTF-MIN=55244NT @ 1753UT BOUTF-AVG=55299NT
GOES7-MAX=P:+125NT@ 1727UT GOES7-MIN=N:-029NT@ 1014UT G7-AVG=+071,+057,+002
GOES6-MAX=P:+125NT@ 2145UT GOES6-MIN=N:-014NT@ 1307UT G6-AVG=+076,+023,+013
FLUXFCST=STD:218,225,230;SESC:210,210,205 BAI/PAI-FCST=020,030,030/035,050,075
KFCST=4445 5444 4445 5444 28DAY-AP=052,018 28DAY-KP=2555 5665 4243 4322
WARNINGS=*MAJFLR;*PROTON;*PCA;*GSTRM;*AURMIDWRN;*AURLOWWCH
ALERTS=**MAJFLR:X1.0/2N,S11W50(6818),0905-0912-0935,II=2@0919,IV=1@0946;
**TENFLR:390SFU@0907,DUR=11;**MINFLR:M2.1@0154;**MINFLR:M1.0@0818;
**MINFLR:M1.1@0831;**MINFLR:M2.7@1144;**MINFLR:M1.6@2044
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
The highlight of the day was a class X1.0/2N tenflare at 09:12 UT that
was accompanied by minor radio emissions. Of the emissions observed, an
impressive Type II sweep was observed. Although this Type II did not have a
particularly strong radio signature, the speed of the estimated disturbance
propagating outward was an impressive 1,000 kilometers per second. A weak
Type IV sweep frequency event was also observed at 09:46 UT. Overall, this
major flare was not particularly impressive, given its size. The duration of
the flare was a rather impulsive 30 minutes.
Region 6818 (S12W65) which spawned this major event, continued to
exhibit growth and increased in magnetic complexity during the UT day. It is
now a beta-gamma-delta magnetic group with the delta occurring in the leader
spot complex. This corresponds to the hottest plage area observed in the
region.
The only optically uncorrelated M-class flare occurred at 20:44 UT. A
likely source lies just beyond the east limb with the complex of regions
(6781, 6782, 6786 and 6795) which are due to return over the next 24 hours.
Region 6786 previously produced 5 M-class events on its last rotation, but
was rather small in size when it departed the west limb about two weeks ago.
Two new regions were numbered today. Region 6823 (N03E17) rapidly
developed today and spawned several high-level C-class flares. The other
active region numbered today was Region 6824 (S21E71) which rotated into view
and produced some surge activity.
Further major flaring from Region 6818 is possible. M-class flaring
will also continue.
Geomagnetic activity today was unsettled to active. Conditions on 09
September should be mostly active with a few possible periods of minor
storming over the higher latitudes. On 10 September, activity is expected
to increase to minor storm levels. By 11 September, minor to major storming
is possible. The combined effects of a well placed coronal hole, several
disappearing solar filaments on 05 September, and the recent major X-class
flares are expected to be responsible for the increased activity levels.
Auroral activity warnings and watches have been issued for the middle
and low latitudes respectively. A respectable amount of auroral activity is
expected to accompany this activity. High to northerly middle latitudes
should witness the most energetic activity. However, the accompanying
luminosity should be sufficient to be observed over the middle to possibly
the lower latitudes. Activity is expected to peak on 10 or 11 September.
Lunar phase will not interfere with observations.
HF signals will become degraded over the high and middle latitude
regions. Degradation will be greatest during the local evening and early
morning hours. A fairly significant amount of auroral flutter, fading and
noise can be expected over these regions. Low latitudes can expect mostly
good to fair propagation conditions, but with notable flutter and fading from
signals traversing the higher latitude paths.
VHF auroral backscatter will become a definite possibility over the
middle latitudes if this disturbance reaches forecasted levels of activity.
** End of Daily Update **