Viewing archive of Tuesday, 15 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 15 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 349 Issued at 2200Z on 15 DEC 1998IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z SOLAR ACTIVITY WAS LOW. ONLY C-CLASS X-RAY EVENTS
OCCURRED DURING THE PERIOD. REGION 8408 (S18W40) AND REGION 8409
(S28W25) PRODUCED SEVERAL SUBFLARES. REGION 8408 HAS SHOWN SOME
SLOW DECAY SINCE YESTERDAY, AND IS NOW A DAO BETA GROUP WITH ELEVEN
SPOTS. ONE NEW REGION WAS NUMBERED, 8413 (N18E13), AND IS CURRENTLY
A BXO BETA SPOT GROUP WITH TWO SPOTS.
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 EITHER REGION 8408 OR 8409.
IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z
THE GEOMAGNETIC FIELD WAS QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET.
III. Event Probabilities 16 DEC to 18 DEC
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 15 DEC 142 Predicted 16 DEC-18 DEC 140/135/132 90 Day Mean 15 DEC 132
V. Geomagnetic A Indices
OBSERVED AFR/AP 14 DEC 005/004 ESTIMATED AFR/AP 15 DEC 004/004 PREDICTED AFR/AP 16 DEC-18 DEC 008/008-010/010-010/010
VI. Geomagnetic Activity Probabilities 16 DEC to 18 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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