Viewing archive of Saturday, 11 October 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 Oct 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 284 Issued at 2200Z on 11 OCT 1997IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS VERY LOW. REGION 8092 (N24E01), NOW
SPOTLESS, PRODUCED A B4/0F FLARE WITH TYPE II SWEEP AT 0858Z. THE
TWO SPOTTED REGIONS, 8093 (N31E14) AND 8094 (N21W37), WERE QUIET AND
STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD WAS AT MINOR TO MAJOR STORM LEVELS THE FIRST
HALF OF THE PERIOD. ACTIVITY INCREASED JUST AFTER A WEAK SUDDEN
IMPULSE PASSED AT APPROXIMATELY 10/1630Z. THIS DISTURBANCE IS
THOUGHT TO BE DUE TO THE PASSAGE OF A CME THAT LEFT THE SUN ON 07
OCTOBER. MOSTLY QUIET CONDITIONS HAVE PREVAILED SINCE 1200Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO MILDLY ACTIVE THROUGHOUT THE PERIOD.
III. Event Probabilities 12 OCT to 14 OCT
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 OCT 086 Predicted 12 OCT-14 OCT 085/085/085 90 Day Mean 11 OCT 084
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 OCT 025/027 ESTIMATED AFR/AP 11 OCT ???/??? PREDICTED AFR/AP 12 OCT-14 OCT 010/???-010/???-010/???
VI. Geomagnetic Activity Probabilities 12 OCT to 14 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 40% | 40% |
| Minor storm | 25% | 20% | 20% |
| Major-severe storm | 10% | 05% | 05% |
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