Viewing archive of Saturday, 15 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 15 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 106 Issued at 2200Z on 15 APR 2000IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z SOLAR ACTIVITY INCREASED TO MODERATE LEVELS. REGION
8955 (S22E20) SHOWED A GRADUAL INCREASE IN MAGNETIC COMPLEXITY
DURING THE PERIOD AND PRODUCED SEVERAL FLARES, TWO OF WHICH REACHED
M-CLASS. THE FIRST WAS AN M4/SF AT 15/1018Z ASSOCIATED WITH A 570
SFU TENFLARE AND A PARTIAL-HALO CME. THE SECOND WAS AN M2/1N AT
15/1448Z. ANOTHER FLARE OF NOTE FROM REGION 8955 WAS A C7/1N AT
15/1905Z ASSOCIATED WITH A SMALL FILAMENT DISAPPEARANCE. MINOR
GROWTH WAS REPORTED IN REGION 8951 (N12W31). REGION 8948 (S16W76)
PRODUCED ISOLATED LOW-LEVEL C-CLASS FLARES AS IT CONTINUED TO DECAY.
THE REMAINING REGIONS WERE STABLE. NO NEW REGIONS WERE ASSIGNED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE AT
LOW TO MODERATE LEVELS. REGION 8955 MAY PRODUCE ADDITIONAL M-CLASS
FLARES.
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
GEOMAGNETIC FIELD ACTIVITY WAS AT QUIET LEVELS. THE GREATER THAN 2
MEV ELECTRON FLUX AT GEOSYNCHROUNOUS ORBIT REMAINED AT MODERATE TO
HIGH LEVELS.
IIB. Geophysical Activity Forecast
GEOMAGNETIC FIELD ACTIVITY IS
EXPECTED TO INCREASE TO UNSETTLED TO ACTIVE LEVELS DURING 16 APRIL
IN RESPONSE TO A PARTIAL-HALO CME OBSERVED LATE ON 13 APRIL. ACTIVE
LEVELS ARE ALSO POSSIBLE ON 18 APRIL DUE TO THE PARTIAL-HALO CME
OBSERVED EARLIER TODAY. THE GREATER THAN 2 MEV ELECTRON FLUX IS
EXPECTED TO RANGE FROM NORMAL TO HIGH LEVELS DURING THE PERIOD.
III. Event Probabilities 16 APR to 18 APR
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 15 APR 164 Predicted 16 APR-18 APR 165/165/165 90 Day Mean 15 APR 184
V. Geomagnetic A Indices
OBSERVED AFR/AP 14 APR 002/005 ESTIMATED AFR/AP 15 APR 007/008 PREDICTED AFR/AP 16 APR-18 APR 018/020-010/012-015/018
VI. Geomagnetic Activity Probabilities 16 APR to 18 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 40% | 25% | 30% |
| Minor storm | 20% | 10% | 15% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 45% | 30% | 40% |
| Minor storm | 25% | 15% | 20% |
| Major-severe storm | 10% | 05% | 05% |
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