Viewing archive of Thursday, 31 July 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 Jul 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 212 Issued at 2200Z on 31 JUL 1997IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z SOLAR ACTIVITY WAS VERY LOW. THE SOLAR DISK IS
CURRENTLY SPOTLESS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO MINOR STORM LEVELS. MOST
ACTIVITY OCCURRED FROM ABOUT 31/0200-1000Z. THE SOURCE OF THE
ACTIVITY IS NOT CERTAIN BUT MAY BE THE RESULT OF A HIGH-SPEED
CORONAL HOLE STREAM.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE FOR THE DURATION OF THE FORECAST
PERIOD.
III. Event Probabilities 01 AUG to 03 AUG
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 31 JUL 070 Predicted 01 AUG-03 AUG 070/070/070 90 Day Mean 31 JUL 073
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 JUL 008/007 ESTIMATED AFR/AP 31 JUL 015/022 PREDICTED AFR/AP 01 AUG-03 AUG 015/012-015/010-015/008
VI. Geomagnetic Activity Probabilities 01 AUG to 03 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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