Viewing archive of Saturday, 20 September 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 Sep 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 263 Issued at 2200Z on 20 SEP 1997IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z SOLAR ACTIVITY HAS BEEN LOW. A LONG DURATION EVENT
OCCURRED AT 20/1044Z FROM A C2 FLARE WHICH WAS UNCORRELATED
OPTICALLY. REGION 8086 (N29W38) IS THE ONLY SPOTTED REGION ON THE
SOLAR DISK TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW. C-CLASS FLARING IS POSSIBLE FROM REGION 8086.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET THROUGH THE FORECAST PERIOD.
III. Event Probabilities 21 SEP to 23 SEP
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 20 SEP 088 Predicted 21 SEP-23 SEP 086/084/086 90 Day Mean 20 SEP 080
V. Geomagnetic A Indices
OBSERVED AFR/AP 19 SEP 002/003 ESTIMATED AFR/AP 20 SEP 005/005 PREDICTED AFR/AP 21 SEP-23 SEP 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 21 SEP to 23 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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