Viewing archive of Monday, 21 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 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 111 Issued at 2200Z on 21 APR 1997IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z SOLAR ACTIVITY WAS VERY LOW. NO FLARES OCCURRED AS THE
VISIBLE DISK REMAINED SPOTLESS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO ACTIVE FOR THE PAST 24 HOURS.
THE GREATER THAN 2 MEV ELECTRON FLUX WAS MODERATE TO HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY UNSETTLED FOR THE NEXT 24 HOURS, WITH THE
CONTINUED CHANCE FOR ISOLATED PERIODS OF ACTIVE CONDITIONS. ACTIVITY
ON DAYS TWO AND THREE IS EXPECTED TO DECREASE TO QUIET TO UNSETTLED.
III. Event Probabilities 22 APR to 24 APR
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 21 APR 070 Predicted 22 APR-24 APR 071/071/071 90 Day Mean 21 APR 074
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 APR 006/004 ESTIMATED AFR/AP 21 APR 011/010 PREDICTED AFR/AP 22 APR-24 APR 012/015-012/010-010/010
VI. Geomagnetic Activity Probabilities 22 APR to 24 APR
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 20% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 20% |
| Minor storm | 15% | 10% | 05% |
| Major-severe storm | 05% | 05% | 01% |
All times in UTC
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