Viewing archive of Sunday, 9 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 09 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 100 Issued at 2200Z on 09 APR 2000IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z SOLAR ACTIVITY HAS BEEN MODERATE. REGION 8948 (S15E01)
PRODUCED AN M1/1N FLARE AT 0416Z. THIS REGION CONTINUES TO DOMINATE
THE DISK IN TERMS OF MAGNETIC COMPLEXITY AND FLARE PRODUCTION, AND
CONTINUES TO POSSESS A SMALL DELTA SPOT. GROWTH IN THE REGION HAS
LEVELED OFF. NEW REGION 8953 (S14E72) ROTATED INTO VIEW TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE OVER THE NEXT THREE DAYS, WITH A FAIR-TO-GOOD CHANCE FOR
ADDITIONAL M-FLARES FROM REGION 8948.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED DURING THE PAST 24
HOURS. THE SOLAR WIND SPEED CONTINUES TO BE ENHANCED (510-600 KM/S)
BUT SHOWS LOW DENSITY (1-3 P/CC) AND WEAK MAGNETIC FIELDS (3 TO 5
NT).
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE GENERALLY UNSETTLED FOR THE NEXT 24 HOURS, AND QUIET
TO UNSETTLED FOR THE SECOND AND THIRD DAYS.
III. Event Probabilities 10 APR to 12 APR
| Class M | 60% | 60% | 60% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 09 APR 176 Predicted 10 APR-12 APR 175/170/170 90 Day Mean 09 APR 186
V. Geomagnetic A Indices
OBSERVED AFR/AP 08 APR 008/014 ESTIMATED AFR/AP 09 APR 010/010 PREDICTED AFR/AP 10 APR-12 APR 010/010-007/010-005/008
VI. Geomagnetic Activity Probabilities 10 APR to 12 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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