Viewing archive of Friday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 269 Issued at 2200Z on 26 SEP 1997IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY WAS LOW. THE LARGEST FLARE OF THE PAST
DAY WAS A C4/SN AT 26/0317Z IN REGION 8088 (S29W16). THIS REGION HAS
SHOWN SLOW DECAY IN BOTH SUNSPOT AREA AND NUMBER SINCE YESTERDAY.
THE REMAINING SUNSPOTS IN THIS REGION ARE IN A SIMPLE BIPOLAR
CONFIGURATION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
C-CLASS ACTIVITY IS EXPECTED IN REGION 8088. AN ISOLATED M-CLASS
FLARE IS ALSO POSSIBLE.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO ENTER STORM CONDITIONS WITHIN THE NEXT 24 HOURS IN
RESPONSE TO ACTIVITY OBSERVED ON 23-24 SEP.
III. Event Probabilities 27 SEP to 29 SEP
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 02% | 02% | 02% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 SEP 089 Predicted 27 SEP-29 SEP 090/090/090 90 Day Mean 26 SEP 082
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 SEP 003/003 ESTIMATED AFR/AP 26 SEP 005/007 PREDICTED AFR/AP 27 SEP-29 SEP 040/030-020/020-015/018
VI. Geomagnetic Activity Probabilities 27 SEP to 29 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 15% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
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