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91-10-09.DLY
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1991-10-09
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/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
09 OCTOBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 09 OCTOBER
-----------------------------------------------------
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 282, 10/09/91
10.7 FLUX=184 90-AVG=198 SSN=211 BKI=3433 1212 BAI=011
BGND-XRAY=C1.4 FLU1=1.9E+06 FLU10=7.5E+03 PKI=4423 2322 PAI=015
BOU-DEV=038,069,029,021,006,016,009,016 DEV-AVG=025 NT SWF=00:000
XRAY-MAX= M1.2 @ 0640UT XRAY-MIN= B9.5 @ 2358UT XRAY-AVG= C2.4
NEUTN-MAX= +004% @ 1230UT NEUTN-MIN= -004% @ 1315UT NEUTN-AVG= +0.6%
PCA-MAX= +0.1DB @ 2350UT PCA-MIN= -0.9DB @ 1925UT PCA-AVG= -0.1DB
BOUTF-MAX=55318NT @ 0333UT BOUTF-MIN=55269NT @ 1734UT BOUTF-AVG=55298NT
GOES7-MAX=P:+150NT@ 1827UT GOES7-MIN=N:-009NT@ 0057UT G7-AVG=+092,+050,+007
GOES6-MAX=P:+149NT@ 2013UT GOES6-MIN=E:-019NT@ 0515UT G6-AVG=+101,-004,+028
FLUXFCST=STD:182,185,185;SESC:180,180,180 BAI/PAI-FCST=012,010,007/015,015,010
KFCST=3324 3333 2224 4311 27DAY-AP=010,024 27DAY-KP=2122 3333 4344 4432
WARNINGS=*MAJFLR
ALERTS=
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity was moderate today. A lone class M1.2 xray event at
06:40 UT was responsible for the moderate rating today. This event was not
optically correlated with any flaring on the visible disk. A possible source
was Regions 6850/6853 which departed from view during the day today. Aside
from this event, only occassional C-class flares were observed from the other
visible regions.
Region 6861 (N08W60) was stable today and did not experience any growth
or decay. This region is still capable of occassional C and perhaps an
isolated M-class flare.
Three new regions were assigned today: Region 6874 (N01E67), Region
6875 (N15E68) and Region 6876 (S14W56) which experienced rapid growth today.
The only other particularly notable events were surging on the west limb
associated with departed Regions 6850 and 6853, and the disappearance of a
filament near the central meridian. This filament was measured to be
approximately 18 degrees in length and could have a low terrestrial impact on
13 October. The filament disappeared sometime between 16:40 UT yesterday and
14:45 UT today.
The geomagnetic field stabilized today from active levels to generally
quiet levels. Continued stabilization is anticipated until approximately 13
October, when an increase back to active levels may occur if todays
filament disappearance has a terrestrial impact.
Auroral activity was moderate over the high latitude regions. Activity
was generally confined to these regions. No significant middle latitude
activity was visible. Conditions have stabilized over the last 12 hours and
are now fairly dormant. Only low levels of activity are now visible over the
high latitude regions. No middle latitude activity is anticipated over the
next 24 to 48 hours. The Middle Latitude Auroral Activity Watch has been
cancelled.
HF propagation conditions were normal to slightly above normal over all
regions today. High and polar latitude regions improved from generally poor
propagation conditions to mostly fair conditions by the end of the UT day.
Reports of a good openings on 10 meters from North America to Europe were
confirmed today by several amateur radio operators. Further improvements in
propagation conditions are anticipated over the next 24 to 48 hours. High
and polar latitude signal degradation might occur on 13 October if todays
filament eruption has a terrestrial impact. This should not significantly
affect middle or low latitude path signals, although an increase in
night-time signal fading may occur on 13 October. Until then, conditions
should remain normal to above normal.
** End of Daily Update **