Viewing archive of Wednesday, 11 November 1998

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 1998 Nov 11 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 315 Issued at 2200Z on 11 NOV 1998

IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z

SOLAR ACTIVITY CONTINUED AT A MODERATE LEVEL. TWO OPTICALLY UNCORRELATED M1 FLARES OCCURRED AT 11/0407Z AND 11/1016Z. THE PROBABLE SOURCE FOR THESE TWO EVENTS ARE DEPARTED REGION 8375 (N21W96). SEVERAL SMALL C-CLASS EVENTS DURING THE PERIOD WERE ATTRIBUTABLE TO REGION 8375. REGION 8384 (S27E54) HAS SHOWN ITSELF WITH A LARGE PENUMBRAL AREA AND SEVERAL UMBRAE. IT IS LIKELY ONE OF THESE UMBRAE IS OF OPPOSITE POLARITY BUT THAT LIKELIHOOD COULD NOT BE VERIFIED. A MODERATELY LARGE, HIGH LATITUDE, FILAMENT LOCATED NEAR N43W48 FADED BETWEEN APPROXIMATELY 11/1100-1400Z. NEW REGION 8385 (N19W29) EMERGED BETWEEN TWO EXISTING REGIONS. THE GROWTH RATE OF THIS REGION WAS LOW TO MODERATE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO TREND TOWARD LOW LEVELS AS REGION 8375 ROTATES FARTHER BEHIND THE WEST LIMB. ISOLATED M-CLASS EVENTS REMAIN POSSIBLE FOR 12-13 NOV FROM THAT AREA. REGION 8384 COULD BEGIN TO PRODUCE C AND POSSIBLY M-CLASS EVENTS. AT THIS TIME, NEW REGION 8385 IS NOT EXPECTED TO BECOME A SIGNIFICANT FLARE PRODUCER. HOWEVER, CONTINUED GROWTH COULD BEGIN A PERIOD OF INTERACTION WITH OTHER NEARBY REGIONS AND AN INCREASE IN FLARE PRODUCTIVITY.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD WAS QUIET AT ALL LATITUDES. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS BRIEFLY REACHED HIGH LEVELS AROUND 11/1630Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE QUIET TO UNSETTLED FOR 12 NOV. UNSETTLED TO SLIGHTLY ACTIVE CONDITIONS ARE FORECAST FOR 13-14 NOV. ISOLATED MINOR STORM PERIODS ARE POSSIBLE DURING THAT INTERVAL. THIS FORECAST IS BASED UPON A PARTIAL HALO CORONAL MASS EJECTION OBSERVED ON 09 NOV.
III. Event Probabilities 12 NOV to 14 NOV
Class M60%35%20%
Class X20%10%05%
Proton20%15%10%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       11 NOV 147
  Predicted   12 NOV-14 NOV  142/140/140
  90 Day Mean        11 NOV 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 NOV  005/006
ESTIMATED AFR/AP 11 NOV  003/010
PREDICTED AFR/AP 12 NOV-14 NOV  008/010-015/020-015/015
VI. Geomagnetic Activity Probabilities 12 NOV to 14 NOV
A. Middle Latitudes
Active10%30%30%
Minor storm05%15%15%
Major-severe storm01%05%05%
B. High Latitudes
Active10%35%35%
Minor storm05%15%15%
Major-severe storm05%05%05%

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