Viewing archive of Sunday, 23 April 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 Apr 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 114 Issued at 2200Z on 23 APR 2000IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z SOLAR ACTIVITY WAS LOW. REGION 8971 (N18E41) PRODUCED
THE LARGEST FLARE, A C7/1N AT 22/2354UT. THIS REGION IS GROWING IN
SUNSPOT AREA AND MAGNETIC COMPLEXITY. REGION 8970 (S15E43) IS THE
LARGEST AND MOST COMPLEX SUNSPOT GROUP ON THE DISK AND HAS PRODUCED
SEVERAL SMALL SUBFLARES. REGIONS 8966 (S13W06), 8967 (N22E09), AND
8972 (N34W21) ALSO GENERATED SMALL FLARES. NEW REGIONS 8974 (S21W36)
AND 8975 (S25E50) WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGIONS 8970, 8971, AND 8972 ARE THE MOST PROBABLE
SOURCES OF ACTIVITY. A MAJOR FLARE IS POSSIBLE IN REGIONS 8970 OR
8971.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 24 APR to 26 APR
| Class M | 50% | 50% | 50% |
| Class X | 02% | 02% | 02% |
| Proton | 02% | 02% | 02% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 23 APR 206 Predicted 24 APR-26 APR 215/220/220 90 Day Mean 23 APR 185
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 APR 004/007 ESTIMATED AFR/AP 23 APR 005/008 PREDICTED AFR/AP 24 APR-26 APR 010/012-010/008-010/008
VI. Geomagnetic Activity Probabilities 24 APR to 26 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
All times in UTC
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