Viewing archive of Thursday, 13 August 1998
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 1998 Aug 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 225 Issued at 2200Z on 13 AUG 1998IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z SOLAR ACTIVITY WAS LOW. REGION 8297 (N32W16) PRODUCED
AN OPTICAL SUB-FLARE AT 13/0538UT AND HAS BEEN QUIET AND STABLE
SINCE THEN. REGION 8299 (N15W01) HAS BEEN SHOWING PLAGE ENHANCEMENTS
AND FLUCTUATIONS FOR MOST OF THE DAY. THIS REGION PRODUCED 3 C-CLASS
X-RAY FLARES AND 5 OPTICAL SUB-FLARES. THE MAGNETIC CONFIGURATION
HAS BECOME MORE COMPLEX, RESULTING IN A CKO BETA-GAMMA-DELTA SPOT
GROUP. THE SIZE HAS REMAINED THE SAME AS YESTERDAY, AROUND 520
MILLIONTHS. REGION 8293 (S22W70) HAS SHOWN RENEWED ACTIVITY LATE IN
THE DAY WITH 2 C-CLASS FLARES. THE LARGEST WAS A C9/SF AT 13/1756UT.
THE MAUNA LOA SOLAR OBSERVATORY REPORTED A CORRESPONDING CME COMING
OFF OF THE WEST LIMB AT S30 AT 13/1800UT. NO OTHER SIGNIFICANT
ACTIVITY WAS NOTED AND THE REST OF THE REGIONS WERE QUIET AND STABLE
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
REGIONS 8293 AND 8297 CAN BE EXPECTED TO CONTINUE TO PRODUCE
ISOLATED C-CLASS FLARES. BOTH REGIONS ALSO HAVE A SLIGHT CHANCE OF
PRODUCING AN M-CLASS FLARE.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO CONTINUE TO BE QUIET TO UNSETTLED.
III. Event Probabilities 14 AUG to 16 AUG
| Class M | 30% | 20% | 25% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 13 AUG 137 Predicted 14 AUG-16 AUG 140/135/130 90 Day Mean 13 AUG 112
V. Geomagnetic A Indices
OBSERVED AFR/AP 12 AUG 005/010 ESTIMATED AFR/AP 13 AUG 008/013 PREDICTED AFR/AP 14 AUG-16 AUG 005/008-005/008-005/008
VI. Geomagnetic Activity Probabilities 14 AUG to 16 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 05% | 01% | 01% |
All times in UTC
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