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91-11-17.DLY
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1991-11-17
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/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
17 NOVEMBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 17 NOVEMBER
------------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 321, 11/17/91
10.7 FLUX=164.5 90-AVG=196 SSN=125 BKI=2234 3433 BAI=016
BGND-XRAY=B7.9 FLU1=7.9E+05 FLU10=4.5E+04 PKI=3234 3333 PAI=016
BOU-DEV=019,013,027,043,035,057,021,022 DEV-AVG=029 NT SWF=03:026
XRAY-MAX= M1.9 @ 1834UT XRAY-MIN= B7.7 @ 1448UT XRAY-AVG= C1.6
NEUTN-MAX= +003% @ 2300UT NEUTN-MIN= -002% @ 1715UT NEUTN-AVG= +0.5%
PCA-MAX= +0.3DB @ 2320UT PCA-MIN= -0.2DB @ 2335UT PCA-AVG= -0.1DB
BOUTF-MAX=55316NT @ 0646UT BOUTF-MIN=55259NT @ 1836UT BOUTF-AVG=55295NT
GOES7-MAX=P:+101NT@ 1630UT GOES7-MIN=N:-031NT@ 1119UT G7-AVG=+063,+052,+007
GOES6-MAX=P:+112NT@ 2048UT GOES6-MIN=E:-032NT@ 0607UT G6-AVG=+076,+003,+023
FLUXFCST=STD:175,185,190;SESC:170,180,190 BAI/PAI-FCST=020,015,015/023,018,018
KFCST=4455 5333 4345 4333 27DAY-AP=020,018 27DAY-KP=3344 3332 2232 3345
WARNINGS=*MAJFLR;*AURMIDWCH
ALERTS=**MINFLR:M1.5@0201;**TENFLR:@0201;**MINFLR:M1.1@0716;
**MINFLR:M1.9@1834;**TENFLR:@1831;**PROTNENH;**SWEEP:II@0203
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity was solidly moderate today. Three M-class flares were
observed. Two of these three events originated from newly assigned Region
6929 (S10E74). This is the return of Region 6891. The first M-class flare
was a class M1.1/SF at 07:16 UT. The second was a class M1.9/2B tenflare at
18:34 UT. This last event produced a very impressive limb spray to more than
0.56 solar radii. This region is presently too near to the limb to discern
any detail. However, it obviously still possesses some degree of complexity.
Region 6919 (S12W44) produced the only other M-class flare today. This
was a class M1.1/2B tenflare at 02:01 UT. It was associated with a Type II
sweep at 02:03 UT. Region 6919 continued to gradually decay.
New Region 6928 (S16E36) was numbered today. Also of interest were two
disappearing filaments which were located in the eastern quadrant. The first
was approximately 12 degrees long and disappeared near S10E36. The second
was a larger 21 degree filament and disappeared near N43E61.
Solar activity will remain moderate. Region 6929 is now the most
prolific flare producer of the groups presently visible. Region 6919 may
also be responsible for an isolated M-class flare. There continues to be a
slight risk for an isolated major flare from Region 6929.
The geomagnetic field was quiet to active over the last 24 hours.
Auroral activity was relatively dormant. Conditions should become slightly
enhanced when effects from the major flare of 15 November are due to arrive.
No significant activity is expected.
Protons at greater than 10 MeV are still very slightly enhanced.
Protons will not reach the event threshold unless another major proton flare
erupts from Region 6919 and this is not anticipated.
HF propagation conditions have been near normal over all regions today.
No significant degradation is anticipated for the low and most middle
latitudes. Conditions over the high latitudes may become degraded (to fair
or poor levels) over the next 24 hours if effects from the last major flare
arrive. No significant disturbances are anticipated.
** End of Daily Update **