Viewing archive of Tuesday, 22 April 1997
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 1997 Apr 22 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 112 Issued at 2200Z on 22 APR 1997IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z SOLAR ACTIVITY WAS VERY LOW. NO FLARES OCCURRED. NEW
REGION 8035 (N17E64), A SINGLE SPOT 'AXX' ALPHA GROUP WAS NUMBERED
TODAY. AN 18 DEGREE DISAPPEARING FILAMENT WAS REPORTED OVERNIGHT
FROM APPROXIMATE LOCATION N47E27.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
VERY LOW.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO ACTIVE AT MIDDLE LATITUDES
AND QUIET TO MINOR STORM AT HIGH LATITUDES FOR THE PAST 24 HOURS.
TODAY'S ACTIVE AND MINOR STORM CONDITIONS WERE CONFINED TO THE
INTERVAL 22/0000-0600Z, MARKING THE END OF A DISTURBANCE THAT BEGAN
YESTERDAY AT APPROXIMATELY 21/1200Z. WIND DATA SUGGEST THAT THIS
DISTURBANCE WAS DUE TO A TRANSIENT IN THE SOLAR WIND. ACTIVITY
FOLLOWING THE END OF THE DISTURBANCE DECREASED TO MOSTLY QUIET FOR
THE REMAINDER OF THE REPORTING PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS, WITH THE
CHANCE FOR ISOLATED PERIODS OF ACTIVE CONDITIONS.
III. Event Probabilities 23 APR to 25 APR
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 22 APR 071 Predicted 23 APR-25 APR 071/071/072 90 Day Mean 22 APR 074
V. Geomagnetic A Indices
OBSERVED AFR/AP 21 APR 015/016 ESTIMATED AFR/AP 22 APR 015/015 PREDICTED AFR/AP 23 APR-25 APR 010/012-010/010-010/010
VI. Geomagnetic Activity Probabilities 23 APR to 25 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
All times in UTC
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