Viewing archive of Monday, 14 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 14 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 348 Issued at 2200Z on 14 DEC 1998IA. Analysis of Solar Active Regions and Activity from 13-2100Z to 14-2100Z SOLAR ACTIVITY WAS LOW. ONLY MINOR AND MODERATE C-CLASS
X-RAY EVENTS OCCURRED THIS PERIOD. THE MOST ACTIVE REGION WAS 8408
(S19W28). THIS REGION PRODUCED TWO C7 X-RAY EVENTS, A 1F OPTICAL
FLARE, AND SEVERAL OPTICAL SUBFLARES. REGION 8408 HAS CONTINUED TO
GROW IN SIZE, CURRENTLY WITH AN AREA OF 250 MILLIONTHS. THE MAGNETIC
CLASSIFICATION IS BETA-GAMMA, LOSING THE DELTA CONFIGURATION NOTED
YESTERDAY. REGION 8409 (S28E01) IS A 22 SPOT ESI BETA-GAMMA GROUP
THAT HAS SHOWN VERY LITTLE ACTIVITY. THE REST OF THE REGIONS WERE
MOSTLY STABLE WITH LITTLE IF ANY ACTIVITY.
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 FROM REGIONS 8408 AND 8409.
IIA. Geophysical Activity Summary 13-2100Z to 14-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET WITH A SINGLE PERIOD OF
UNSETTLED ACTIVITY OCCURRING AT MID LATITUDE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET.
III. Event Probabilities 15 DEC to 17 DEC
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 14 DEC 144 Predicted 15 DEC-17 DEC 140/140/135 90 Day Mean 14 DEC 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 13 DEC 002/003 ESTIMATED AFR/AP 14 DEC 005/008 PREDICTED AFR/AP 15 DEC-17 DEC 005/008-005/008-010/010
VI. Geomagnetic Activity Probabilities 15 DEC to 17 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 | 01% | 01% | 01% |
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