Viewing archive of Monday, 21 February 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 Feb 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 052 Issued at 2200Z on 21 FEB 2000IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z SOLAR ACTIVITY WAS MODERATE. TWO MINOR M-CLASS EVENTS,
BOTH OPTICALLY UNCORRELATED, WERE OBSERVED DURING THE PERIOD. THE
FIRST WAS AN M2 AT 20/2207, AND THE SECOND WAS AN M1 AT 21/0836.
SEVERAL OTHER MINOR C-CLASS EVENTS WERE ALSO REPORTED. NEW REGION
8881 (N19E53), AND 8882 (S16E69) WERE NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE WITH THE POSSIBILITY OF AN ISOLATED M-CLASS EVENT.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO MINOR STORM. ONE ISOLATED PERIOD
OF MINOR STORM CONDITIONS WAS OBSERVED FROM 21/1500-1800Z DUE TO A
SHORTLIVED DISTURBANCE IN THE MAGNETIC FIELD, AND MAY BE RELATED TO
A TYPE II SWEEP THAT OCCURRED BACK ON 18 FEBRUARY.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY QUIET TO UNSETTLED WITH THE POSSIBILITY OF
ACTIVE CONDITIONS ON THE FIRST AND THIRD DAY OF THE PERIOD.
III. Event Probabilities 22 FEB to 24 FEB
| Class M | 30% | 30% | 25% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 21 FEB 152 Predicted 22 FEB-24 FEB 145/135/130 90 Day Mean 21 FEB 164
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 FEB 005/005 ESTIMATED AFR/AP 21 FEB 016/020 PREDICTED AFR/AP 22 FEB-24 FEB 015/025-010/012-015/015
VI. Geomagnetic Activity Probabilities 22 FEB to 24 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 20% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 25% |
| Minor storm | 25% | 10% | 10% |
| Major-severe storm | 10% | 05% | 05% |
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