Viewing archive of Wednesday, 12 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 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 103 Issued at 2200Z on 12 APR 2000IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z SOLAR ACTIVITY REMAINED AT MODERATE LEVELS. REGION 8948
(S16W37) APPEARED TO STABILIZE AS A MODERATE-SIZED, MIXED-POLARITY
REGION FOLLOWING TWO DAYS OF GRADUAL DECAY. IT PRODUCED TWO M-CLASS
FLARES DURING THE PERIOD: AN M1/1N AT 11/2337Z AND AN M1/SF AT
12/0335Z. REGION 8948 ALSO PRODUCED A C2/SN FLARE AT 12/0630Z WITH
AN ASSOCIATED TYPE II RADIO SWEEP. NEW REGION 8959 (S19E29) EMERGED
JUST SOUTH OF REGION 8953 (S16E31).
IB. Solar Activity Forecast
ACTIVITY IS EXPECTED TO BE AT LOW TO
MODERATE LEVELS. THERE IS A FAIR TO GOOD CHANCE FOR ISOLATED M-CLASS
FLARES FROM REGION 8948.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
GEOMAGNETIC FIELD ACTIVITY WAS AT QUIET TO UNSETTLED LEVELS. THE
GREATER THAN 2 MEV ELECTRON FLUX AT GEOSYNCHRNOUS ORBIT WAS AT
MODERATE TO HIGH LEVELS.
IIB. Geophysical Activity Forecast
GEOMAGNETIC FIELD ACTIVITY IS
EXPECTED TO REMAIN AT QUIET TO UNSETTLED LEVELS. AT THIS POINT, IT
APPEARS UNLIKELY THAT WE WILL SEE ANY SIGNIFICANT EFFECTS FROM THE
FAINT HALO-CME OBSERVED EARLY ON 10 APRIL. THE GREATER THAN 2 MEV
ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT IS EXPECTED TO DECLINE TO
NORMAL TO MODERATE LEVELS EARLY IN THE PERIOD.
III. Event Probabilities 13 APR to 15 APR
| Class M | 50% | 45% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 12 APR 173 Predicted 13 APR-15 APR 175/175/170 90 Day Mean 12 APR 185
V. Geomagnetic A Indices
OBSERVED AFR/AP 11 APR 008/010 ESTIMATED AFR/AP 12 APR 008/005 PREDICTED AFR/AP 13 APR-15 APR 012/012-010/010-012/012
VI. Geomagnetic Activity Probabilities 13 APR to 15 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 20% |
| Minor storm | 10% | 05% | 10% |
| Major-severe storm | 05% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 25% |
| Minor storm | 15% | 10% | 15% |
| Major-severe storm | 15% | 10% | 15% |
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