Viewing archive of Friday, 5 November 1999

Solar activity report

Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 1999 Nov 05 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 309 Issued at 2200Z on 05 NOV 1999

IA. Analysis of Solar Active Regions and Activity from 04-2100Z to 05-2100Z

SOLAR ACTIVITY INCREASED TO MODERATE LEVELS. REGION 8749 (S18W51) PRODUCED AN M1/1F FLARE AT 05/1718Z ACCOMPANIED BY MODEST DISCRETE RADIO EMISSION. THIS REGION SHOWED GRADUAL DECAY, BUT RETAINED A MIXED POLARITY STRUCTURE. A LONG-DURATION M3 X-RAY FLARE OCCURRED AT 05/1829Z. THE SOURCE OF THE FLARE WAS JUST BEYOND THE NORTHEAST LIMB WITH POST-FLARE LOOPS OBSERVED AT NE12 FOLLOWING THE FLARE. EXTREMELY INTENSE CA XV ACTIVITY WAS VISIBLE ON THE NORTHEAST LIMB, LIKELY INDICATING THE RETURN OF ACTIVE LONGITUDES. NEW REGIONS 8755 (N19E71), 8756 (N18E11), AND 8757 (N38E09) WERE ASSIGNED DURING THE PERIOD.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE AT LOW TO MODERATE LEVELS. MORE M-CLASS FLARES ARE POSSIBLE FROM THE VICINITY OF THE NORTHEAST LIMB. REGION 8749 MAY ALSO PRODUCE ANOTHER ISOLATED M-CLASS FLARE.
IIA. Geophysical Activity Summary 04-2100Z to 05-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS. A SUDDEN IMPULSE OCCURRED AT 05/2010Z WITH AN ESTIMATED MAGNITUDE OF 13 NT. THERE WAS A SLIGHT INCREASE IN FIELD ACTIVITY FOLLOWING THE IMPULSE. ACE RTSW DATA INDICATED AN ABRUPT, BUT MINOR INCREASE IN SOLAR WIND VELOCITIES AND A GRADUAL RISE IN DENSITIES AT L1 PRIOR TO THE SUDDEN IMPULSE.
IIB. Geophysical Activity Forecast
GEOMAGNETIC FIELD ACTIVITY IS EXPECTED TO BE AT UNSETTLED LEVELS EARLY IN THE PERIOD INCREASING TO UNSETTLED TO ACTIVE LEVELS BY DAY TWO. MINOR STORM PERIODS WILL BE POSSIBLE AT HIGH LATITUDES DURING THE LATTER HALF OF THE PERIOD AS WELL. THIS INCREASED ACTIVITY IS EXPECTED DUE TO RECURRENT CORONAL HOLE EFFECTS. THE GREATER THAN 2 MEV ELECTRON FLUX MAY REACH HIGH LEVELS LATE IN THE PERIOD.
III. Event Probabilities 06 NOV to 08 NOV
Class M30%30%30%
Class X05%05%05%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       05 NOV 161
  Predicted   06 NOV-08 NOV  165/175/185
  90 Day Mean        05 NOV 154
V. Geomagnetic A Indices
OBSERVED AFR/AP 04 NOV  005/005
ESTIMATED AFR/AP 05 NOV  005/007
PREDICTED AFR/AP 06 NOV-08 NOV  012/010-015/018-015/030
VI. Geomagnetic Activity Probabilities 06 NOV to 08 NOV
A. Middle Latitudes
Active20%25%25%
Minor storm05%15%15%
Major-severe storm01%01%05%
B. High Latitudes
Active20%25%35%
Minor storm10%15%20%
Major-severe storm01%01%10%

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