Viewing archive of Friday, 11 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 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 345 Issued at 2200Z on 11 DEC 1998IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS LOW. ONLY MINOR C-CLASS X-RAY EVENTS
OCCURRED DURING THE PERIOD. THE MOST ACTIVE REGIONS WERE 8404
(S22W66), 8405 (S14W08), 8408 (S18E15), AND 8409 (S29E27). EACH OF
THESE REGIONS PRODUCED A C-CLASS X-RAY EVENT AND NUMEROUS OPTICAL
SUBFLARES. REGIONS 8408 AND 8409 HAVE DEVELOPED BETA-GAMMA MAGNETIC
CLASSIFICATIONS. THE REST OF THE REGIONS WERE MOSTLY QUIET AND
STABLE. TWO NEW REGIONS WERE NUMBERED TODAY. REGION 8410 (N23E77) AN
HSX ALPHA GROUP AND REGION 8411(S28E64) AN AXX ALPHA GROUP.
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 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO MOSTLY ACTIVE WITH PERIODS OF
MINOR STORM CONDITIONS AT HIGHER LATITUDES. THESE CONDITIONS MAY
HAVE BEEN THE RESULT OF A CORONAL MASS EJECTION THAT OCCURRED ON THE
NORTH EAST LIMB ON 08 DECEMBER AT 1500UT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 12 DEC to 14 DEC
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 DEC 143 Predicted 12 DEC-14 DEC 128/125/121 90 Day Mean 11 DEC 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 DEC 004/006 ESTIMATED AFR/AP 11 DEC 020/035 PREDICTED AFR/AP 12 DEC-14 DEC 010/014-010/008-010/010
VI. Geomagnetic Activity Probabilities 12 DEC to 14 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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