Viewing archive of Thursday, 27 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 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 118 Issued at 2200Z on 27 APR 2000IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z SOLAR ACTIVITY WAS LOW. INTERMITTENT C-CLASS EVENTS
OCCURRED, WITH REGIONS 8967 (N23W42) AND 8970 (S14W10) THE PRIMARY
CONTRIBUTORS. ALL REGIONS ON THE DISK WERE, IN GENERAL, EITHER
STABLE OR DECAYING. A PROMINENCE ERUPTED FROM THE NW LIMB AT
APPROXIMATELY 1500Z.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO PERSIST
AT THE LOW LEVEL.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE ON 28 APRIL, AS A HIGH SPEED
STREAM MAY HAVE A MINIMAL IMPACT ON THE FIELD. UNSETTLED CONDITIONS
SHOULD PREVAIL FOR THE FINAL TWO DAYS OF THE INTERVAL.
III. Event Probabilities 28 APR to 30 APR
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 27 APR 184 Predicted 28 APR-30 APR 180/175/175 90 Day Mean 27 APR 188
V. Geomagnetic A Indices
OBSERVED AFR/AP 26 APR 003/004 ESTIMATED AFR/AP 27 APR 010/011 PREDICTED AFR/AP 28 APR-30 APR 010/018-010/012-010/010
VI. Geomagnetic Activity Probabilities 28 APR to 30 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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