Viewing archive of Wednesday, 11 August 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 Aug 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 223 Issued at 2200Z on 11 AUG 1999IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS LOW. REGION 8662 (S14E11) PRODUCED A
C1/SF AT 10/2208Z. THIS REGION APPEARS TO HAVE STABILIZED, PRODUCING
ONLY MINOR FLUCTUATIONS FOR MOST OF THE PERIOD. NEW REGION 8665
(S26E66) WAS NUMBERED TODAY. REMAINING REGIONS WERE QUIET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW. REGION 8662 IS THE ONLY REGION LIKELY TO PRODUCE C-CLASS FLARES
AND HAS A SLIGHT CHANCE OF AN M-CLASS EVENT.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN AT QUIET TO UNSETTLED LEVELS.
III. Event Probabilities 12 AUG to 14 AUG
| Class M | 10% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 AUG 128 Predicted 12 AUG-14 AUG 130/135/140 90 Day Mean 11 AUG 164
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 AUG 005/007 ESTIMATED AFR/AP 11 AUG 007/007 PREDICTED AFR/AP 12 AUG-14 AUG 005/007-005/007-005/007
VI. Geomagnetic Activity Probabilities 12 AUG to 14 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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