Viewing archive of Saturday, 23 September 2000

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 2000 Sep 23 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 267 Issued at 2200Z on 23 SEP 2000

IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z

SOLAR ACTIVITY HAS BEEN LOW. THE LARGEST EVENT OF THE DAY WAS AN OPTICALLY UNCORRELATED C8 FLARE AT 22/2350 UTC. EIT IMAGERY SUGGESTS THIS EVENT WAS DUE TO ACTIVITY BEHIND THE NW LIMB. ELSEWHERE, REGION 9169 (N11E04) REMAINS IMPRESSIVE IN SIZE AND MAGNETIC COMPLEXITY, BUT ACTIVITY WAS LIMITED TO SEVERAL LESSER C-CLASS SUBFAINT FLARES THROUGHOUT THE DAY, AND A DISAPPEARING 11-DEGREE SOLAR FILAMENT, THOUGH WITHOUT EVIDENCE OF ANY CME ACTIVITY OF SIGNIFICANCE. REGIONS 9166 (S11W44) AND 9167 (N14W11) WERE ALSO SOURCES OF C-CLASS ACTIVITY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW TO MODERATE. REGION 9169 REMAINS A LIKELY SOURCE OF ISOLATED MAJOR FLARE ACTIVITY, AND REGION 9166 A POSSIBLE SOURCE OF MODERATE ACTIVITY. IIA. GEOPHYSICAL ACTIVITY SUMMARY 22/2100Z TO 23/2100Z: THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS THROUGHOUT THE DAY. GREATER-THAN-2 MEV ELECTRONS AT GEOSYNCHRONOUS ORBIT WERE AT MODERATE LEVELS DURING LOCAL DAYTIME HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO REMAIN AT QUIET TO UNSETTLED LEVELS THROUGH DAY ONE, WITH AN INCREASED CHANCE OF ACTIVE LEVELS AND ISOLATED MINOR STORMING ON DAYS TWO AND THREE, DUE TO THE EXPECTED INFLUENCE OF A FAVORABLY POSITIONED CORONAL HOLE. MODERATE ENHANCEMENTS OF GREATER-THAN-2 MEV ELECTRONS AT GEOSYNCHRONOUS ORBIT ARE EXPECTED TO RECUR DURING LOCAL DAYTIME HOURS THROUGHOUT THE PERIOD.
III. Event Probabilities 24 SEP to 26 SEP
Class M70%70%70%
Class X25%25%25%
Proton05%10%10%
PCAFYELLOW
IV. Penticton 10.7 cm Flux
  Observed       23 SEP 225
  Predicted   24 SEP-26 SEP  225/225/220
  90 Day Mean        23 SEP 180
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 SEP  006/007
ESTIMATED AFR/AP 23 SEP  007/008
PREDICTED AFR/AP 24 SEP-26 SEP  010/010-018/020-015/015
VI. Geomagnetic Activity Probabilities 24 SEP to 26 SEP
A. Middle Latitudes
Active20%25%25%
Minor storm10%15%15%
Major-severe storm01%01%01%
B. High Latitudes
Active25%30%30%
Minor storm10%15%15%
Major-severe storm01%01%01%
VII. COMMENTS EFFECTIVE 2 OCT 2000, SEC WILL ISSUE ITS TEXT PRODUCTS IN MIXED CASE VS. ALL UPPER CASE. THIS CHANGE WILL BE VISIBLE ON ALL SEC PRODUCT DELIVERY SYSTEMS EXCEPT FOR TELETYPE CIRCUITS. ONLY THE CASE OF THE TEXT IN EACH PRODUCT WILL CHANGE, NOT THE FORMAT OR SPACING WITHIN THE PRODUCT. FOR DETAILS SEE OUR WEBSITE AT SEC.NOAA.GOV/MIXEDCASE.HTML

All times in UTC

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