Viewing archive of Wednesday, 22 December 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 Dec 22 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 356 Issued at 2200Z on 22 DEC 1999

IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z

SOLAR ACTIVITY WAS HIGH. REGION 8806 (N19E12) PRODUCED AN IMPULSIVE M5/1B FLARE AT 1904Z. THIS REGION WAS QUITE ACTIVE DURING THE PERIOD AND SHOWS A COMPLEX INVERSION LINE WITH SOME EVIDENCE FOR SHEARED MAGNETIC FIELDS. THE MAGNETIC DELTA CONFIGURATION PERSISTED THROUGH MOST OF THE DAY BUT MAY BE BREAKING UP AS OF FORECAST FILE TIME. AN ADDITIONAL M-CLASS EVENT OCCURRED TODAY AT 0216Z. THIS EVENT WAS COMPLICATED IN THAT IT STARTED WITH AN ERUPTING FILAMENT, FOLLOWED BY EVENT LEVEL FLARES IN 8807 (N10E16) AND 8806. REGION 8798 (S13W47) SHOWED SOME DECAY TODAY AND EXHIBITED FREQUENT PLAGE FLUCTUATIONS, BUT DID NOT PRODUCE SIGNIFICANT FLARE ACTIVITY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE MODERATE. REGIONS 8798 AND 8806 ARE BOTH GOOD CANDIDATES FOR PRODUCING ADDITIONAL M-FLARES. THERE IS A FAIR CHANCE FOR AN ISOLATED MAJOR FLARE EVENT FROM REGION 8806 OVER THE NEXT THREE DAYS.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE MOSTLY QUIET FOR THE NEXT THREE DAYS.
III. Event Probabilities 23 DEC to 25 DEC
Class M75%75%75%
Class X20%20%20%
Proton10%10%10%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       22 DEC 202
  Predicted   23 DEC-25 DEC  200/200/195
  90 Day Mean        22 DEC 173
V. Geomagnetic A Indices
OBSERVED AFR/AP 21 DEC  001/002
ESTIMATED AFR/AP 22 DEC  001/003
PREDICTED AFR/AP 23 DEC-25 DEC  005/007-005/007-005/007
VI. Geomagnetic Activity Probabilities 23 DEC to 25 DEC
A. Middle Latitudes
Active15%15%15%
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%15%
Minor storm05%05%05%
Major-severe storm01%01%01%

All times in UTC

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