Viewing archive of Friday, 14 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 14 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 105 Issued at 2200Z on 14 APR 2000IA. Analysis of Solar Active Regions and Activity from 13-2100Z to 14-2100Z
SOLAR ACTIVITY REMAINED AT LOW LEVELS. REGION 8948
(S15W63) PRODUCED A LONG-DURATION C1 PARALLEL-RIBBON FLARE AT
13/2130Z ASSOCIATED WITH A SMALL FILAMENT DISAPPEARANCE AND A
PARTIAL-HALO CME. THIS REGION, WHICH REMAINED IN A STATE OF GRADUAL
DECAY, ALSO PRODUCED A C7/1F FLARE AT 14/0816Z. REGIONS 8955
(S22E33) AND 8960 (N19W31) SHOWED MINOR GROWTH DURING THE PERIOD.
THE REMAINING REGIONS WERE STABLE. NO NEW REGIONS WERE ASSIGNED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
THERE IS A FAIR BUT DIMINISHING CHANCE FOR AN ISOLATED LOW-LEVEL
M-CLASS FLARE FROM REGION 8948.
IIA. Geophysical Activity Summary 13-2100Z to 14-2100Z
GEOMAGNETIC FIELD ACTIVITY WAS AT MOSTLY QUIET LEVELS. THE GREATER
THAN 2 MEV ELECTRON FLUX AT GEOSYNCHRONOUS ORBIT WAS AT MODERATE TO
HIGH LEVELS.
IIB. Geophysical Activity Forecast
GEOMAGNETIC FIELD ACTIVITY IS
EXPECTED TO INCREASE TO MOSTLY ACTIVE LEVELS ON 16 APRIL IN RESPONSE
TO THE PARTIAL-HALO CME MENTIONED ABOVE. UNSETTLED CONDITIONS ARE
EXPECTED FOR THE REMAINDER OF THE PERIOD. THE GREATER THAN 2 MEV
ELECTRON FLUX IS EXPECTED TO DECREASE TO NORMAL TO MODERATE LEVELS
SOMETIME DURING THE PERIOD.
III. Event Probabilities 15 APR to 17 APR
| Class M | 30% | 30% | 25% |
| Class X | 05% | 05% | 01% |
| Proton | 05% | 05% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 14 APR 165 Predicted 15 APR-17 APR 165/160/160 90 Day Mean 14 APR 184
V. Geomagnetic A Indices
OBSERVED AFR/AP 13 APR 003/008 ESTIMATED AFR/AP 14 APR 003/004 PREDICTED AFR/AP 15 APR-17 APR 012/012-018/020-010/012
VI. Geomagnetic Activity Probabilities 15 APR to 17 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 40% | 30% |
| Minor storm | 10% | 20% | 10% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 45% | 35% |
| Minor storm | 20% | 25% | 20% |
| Major-severe storm | 05% | 10% | 05% |
All times in UTC
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