Viewing archive of Sunday, 21 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 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 264 Issued at 2200Z on 21 SEP 1997IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z SOLAR ACTIVITY HAS BEEN LOW. AN UNCORRELATED C2 X-RAY
FLARE WAS DETECTED AT 21/0417Z. TWO NEW REGIONS WERE NUMBERED TODAY
AS REGION 8087 (S22E72) AND REGION 8088 (S28E53). REGION 8086
(N26W54) HAS GROWN SLIGHTLY THROUGH THE PERIOD AND IS NOW A CAO SPOT
GROUP.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW FOR THE FORECAST PERIOD.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED THROUGH THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET THE FIRST TWO DAYS OF THE FORECAST WITH
UNSETTLED CONDITIONS EXPECTED THE THIRD DAY DUE TO RECURRENT
ACTIVITY.
III. Event Probabilities 22 SEP to 24 SEP
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 21 SEP 085 Predicted 22 SEP-24 SEP 084/086/088 90 Day Mean 21 SEP 081
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 SEP 007/007 ESTIMATED AFR/AP 21 SEP 005/005 PREDICTED AFR/AP 22 SEP-24 SEP 005/005-005/005-010/012
VI. Geomagnetic Activity Probabilities 22 SEP to 24 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% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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