Viewing archive of Thursday, 21 August 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 Aug 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 233 Issued at 2200Z on 21 AUG 1997IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z SOLAR ACTIVITY WAS VERY LOW. A SINGLE B3/SF FLARE WAS
OBSERVED FROM CURRENTLY SPOTLESS REGION 8074 (N27W54) AT 21/0446Z.
REGION 8073 (N13W60), A ONE SPOT 'HSX' ALPHA GROUP, REMAINS STABLE
AS THE ONLY ACTIVE REGION ON THE VISIBLE DISK.
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 MOSTLY QUIET FOR THE PAST 24 HOURS,
EXCEPT FOR AN ISOLATED PERIOD OF UNSETTLED TO ACTIVE CONDITIONS
DURING THE INTERVAL 21/0000-0600Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY QUIET FOR THE NEXT THREE DAYS, WITH THE CHANCE
FOR ISOLATED PERIODS OF UNSETTLED CONDITIONS.
III. Event Probabilities 22 AUG to 24 AUG
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 21 AUG 075 Predicted 22 AUG-24 AUG 074/074/074 90 Day Mean 21 AUG 073
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 AUG 005/005 ESTIMATED AFR/AP 21 AUG 009/007 PREDICTED AFR/AP 22 AUG-24 AUG 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 22 AUG to 24 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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