Viewing archive of Sunday, 13 December 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 Dec 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 347 Issued at 2200Z on 13 DEC 1998IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z SOLAR ACTIVITY WAS LOW. ONLY MINOR C-CLASS X-RAY EVENTS
OCCURRED THIS PERIOD. THE MOST ACTIVE REGIONS WERE 8404 (S24W86),
8408 (S18W13), AND 8409 (S28E01). REGION 8408 HAS DOUBLED IN SIZE TO
190 MILLIONTHS AND HAS ALSO EVOLVED INTO A BETA-GAMMA-DELTA MAGNETIC
CONFIGURATION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW WITH CONTINUED C-CLASS EVENTS. THERE IS A SLIGHT CHANCE OF AN
ISOLATED M-CLASS EVENT.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET.
III. Event Probabilities 14 DEC to 16 DEC
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 13 DEC 144 Predicted 14 DEC-16 DEC 140/140/140 90 Day Mean 13 DEC 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 12 DEC 007/006 ESTIMATED AFR/AP 13 DEC 005/010 PREDICTED AFR/AP 14 DEC-16 DEC 008/008-008/008-008/008
VI. Geomagnetic Activity Probabilities 14 DEC to 16 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
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