Viewing archive of Tuesday, 25 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 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 116 Issued at 2200Z on 25 APR 2000IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY CONTINUED LOW. MOST OF THE ACTIVITY
ORIGINATED IN REGION 8972 (N34W47). REGIONS 8970 (S15E18) AND 8971
(N18E16) REMAIN IMPRESSIVE IN WHITE LIGHT AND H-ALPHA, BUT AS YET
HAVE BEEN LARGELY UNPRODUCTIVE. LITTLE ELSE OF SIGNIFICANCE
OCCURRED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. AN ISOLATED M-CLASS EVENT MAY ORIGINATE FROM EITHER
REGION 8970, 8971 OR 8972.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED THROUGHOUT THE PERIOD.
III. Event Probabilities 26 APR to 28 APR
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 APR 203 Predicted 26 APR-28 APR 205/205/200 90 Day Mean 25 APR 186
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 APR 014/021 ESTIMATED AFR/AP 25 APR 005/009 PREDICTED AFR/AP 26 APR-28 APR 010/015-010/012-010/010
VI. Geomagnetic Activity Probabilities 26 APR to 28 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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