Viewing archive of Wednesday, 9 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 09 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 343 Issued at 2200Z on 09 DEC 1998IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z SOLAR ACTIVITY WAS LOW. SEVERAL SMALL C-CLASS X-RAY
EVENTS OCCURRED OVER THE LAST 24 HOURS. THE LARGEST WAS A C5/1N
X-RAY EVENT AT 09/1740Z FROM REGION 8405 (S16E20). THE FAST GROWTH
IN REGION 8404 (S23W38), NOTED THE LAST TWO DAYS, APPEARS TO HAVE
ENDED AS A DAI BETA GROUP. NO NEW REGIONS WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW WITH CONTINUED C-CLASS EVENTS. THERE IS A CHANCE FOR AN
ISOLATED M-CLASS EVENT.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET. THE GREATER THAN 2 MEV
ELECTRON FLUX HAS BEEN IN THE MODERATE TO HIGH RANGE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS, LEADING
TOWARD MORE UNSETTLED CONDITIONS NEAR THE END OF THE PERIOD.
III. Event Probabilities 10 DEC to 12 DEC
| Class M | 25% | 25% | 25% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 09 DEC 154 Predicted 10 DEC-12 DEC 151/148/146 90 Day Mean 09 DEC 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 08 DEC 003/005 ESTIMATED AFR/AP 09 DEC 003/005 PREDICTED AFR/AP 10 DEC-12 DEC 008/008-008/010-010/012
VI. Geomagnetic Activity Probabilities 10 DEC to 12 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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