Viewing archive of Friday, 8 October 1999
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 1999 Oct 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 281 Issued at 2200Z on 08 OCT 1999IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z SOLAR ACTIVITY WAS LOW. REGION 8720 (N13E01) PRODUCED
THE LARGEST EVENT OF THE PERIOD WITH A LONG DURATION C6/1N AT
08/1253Z. NEW REGION 8728 (N22E74) WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
THROUGH THE PERIOD WITH A CHANCE FOR AN ISOLATED M-CLASS EVENT.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED THE FIRST DAY OF THE FORECAST
PERIOD. UNSETTLED TO ACTIVE CONDITIONS ARE EXPECTED THE LAST TWO
DAYS IN RESPONSE TO RECURRENT CORONAL HOLE EFFECTS.
III. Event Probabilities 09 OCT to 11 OCT
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 08 OCT 151 Predicted 09 OCT-11 OCT 155/155/158 90 Day Mean 08 OCT 154
V. Geomagnetic A Indices
OBSERVED AFR/AP 07 OCT 005/006 ESTIMATED AFR/AP 08 OCT 010/010 PREDICTED AFR/AP 09 OCT-11 OCT 015/015-020/025-020/030
VI. Geomagnetic Activity Probabilities 09 OCT to 11 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 30% | 30% |
| Minor storm | 10% | 15% | 15% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 35% | 40% |
| Minor storm | 10% | 20% | 25% |
| Major-severe storm | 05% | 05% | 10% |
All times in UTC
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