Viewing archive of Thursday, 31 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 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 365 Issued at 2200Z on 31 DEC 1998IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z SOLAR ACTIVITY DECREASED TO LOW LEVELS. REGION 8421
(N27W27) CONTINUED TO PRODUCE FREQUENT C-CLASS FLARES. ALTHOUGH IT
SHOWED NO SIGNIFICANT CHANGES, IT REMAINED A LARGE GROUP WITH A
COMPACT SPOT DISTRIBUTION AND STRONG MAGNETIC GRADIENTS. REGION 8419
(N28W79) CONTINUED TO SLOWLY DECAY AS IT APPROACHED THE WEST LIMB.
THE REMAINING REGIONS WERE SMALL AND STABLE. NEW REGION 8427
(N16W62) WAS NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8421 MAY PRODUCE ISOLATED M-CLASS FLARES DURING
THE PERIOD. THERE IS ALSO A CHANCE FOR A MAJOR FLARE FROM THIS
REGION.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
THE GEOMAGNETIC FIELD WAS QUIET AT ALL LATITUDES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO UNSETTLED LEVELS.
III. Event Probabilities 01 JAN to 03 JAN
| Class M | 65% | 65% | 65% |
| Class X | 20% | 20% | 20% |
| Proton | 15% | 15% | 15% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 31 DEC 175 Predicted 01 JAN-03 JAN 170/165/165 90 Day Mean 31 DEC 136
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 DEC 005/006 ESTIMATED AFR/AP 31 DEC 003/010 PREDICTED AFR/AP 01 JAN-03 JAN 007/010-005/010-005/010
VI. Geomagnetic Activity Probabilities 01 JAN to 03 JAN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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