Viewing archive of Tuesday, 23 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 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 266 Issued at 2200Z on 23 SEP 1997IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z SOLAR ACTIVITY BECAME VERY LOW DURING THE PERIOD. THE
LARGEST EVENT WAS A B9.5/SF FROM REGION 8088 (S28E25). THE GROWTH
RATE IN THIS REGION SLOWED DURING THE LAST 24 HOURS. MINOR MAGNETIC
FIELD MIXING BECAME VISIBLE IN THE TRAILER OF THIS REGION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS FORECAST TO BE
PREDOMINANTLY LOW WITH OCCASIONAL C-CLASS FLARES EXPECTED FROM
REGION 8088. THIS REGION HAS THE CAPABILITY OF PRODUCING ISOLATED
SMALL M-CLASS EVENTS.
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS.
III. Event Probabilities 24 SEP to 26 SEP
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 23 SEP 092 Predicted 24 SEP-26 SEP 093/094/094 90 Day Mean 23 SEP 081
V. Geomagnetic A Indices
OBSERVED AFR/AP 22 SEP 010/008 ESTIMATED AFR/AP 23 SEP 003/005 PREDICTED AFR/AP 24 SEP-26 SEP 008/008-008/010-008/010
VI. Geomagnetic Activity Probabilities 24 SEP to 26 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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