Viewing archive of Sunday, 28 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 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 271 Issued at 2200Z on 28 SEP 1997IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z SOLAR ACTIVITY WAS LOW DUE TO A C1/EPL ON THE SOUTHWEST
LIMB (SW48) AT 28/1442Z. REGION 8088 (S29W41) IS THE ONLY SPOTTED
REGION CURRENTLY ON THE VISIBLE DISK. THIS REGION HAS CHANGED
LITTLE, MAINTAINING A MODERATELY SIZED D-CLASS SUNSPOT CONFIGURATION
AND CONTINUING TO PRODUCE PLAGE FLUCTUATIONS ASSOCIATED WITH SMALL
B-CLASS X-RAY OUTPUT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
THERE IS AN OUTSIDE CHANCE OF AN ISOLATED M-CLASS FLARE IN REGION
8088.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO MINOR STORM. SOLAR WIND
DATA DOES NOT CLEARLY INDICATE THE ARRIVAL OF A SHOCK FROM THE CME
ACTIVITY OBSERVED ON 23-24 SEP. CURRENT GEOMAGNETIC ACTIVITY MAY BE
RELATED TO THE EQUATORWARD EXTENSION OF A POLAR CORONAL HOLE. THE
GREATER THAN 2 MEV ELECTRON FLUX CROSSED THE HIGH THRESHOLD AT
28/1643Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE. A DISTURBANCE RESULTING FROM THE
ACTIVITY OBSERVED ON 23-24 SEP IS BECOMING LESS LIKELY.
III. Event Probabilities 29 SEP to 01 OCT
| Class M | 10% | 10% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 28 SEP 087 Predicted 29 SEP-01 OCT 086/086/084 90 Day Mean 28 SEP 082
V. Geomagnetic A Indices
OBSERVED AFR/AP 27 SEP 011/013 ESTIMATED AFR/AP 28 SEP 015/020 PREDICTED AFR/AP 29 SEP-01 OCT 020/020-015/012-010/010
VI. Geomagnetic Activity Probabilities 29 SEP to 01 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 15% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 15% |
| Minor storm | 15% | 15% | 05% |
| Major-severe storm | 05% | 05% | 01% |
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