Viewing archive of Wednesday, 30 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 30 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 364 Issued at 2200Z on 30 DEC 1998IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z
SOLAR ACTIVITY WAS MODERATE. REGION 8421 (N26W14)
PRODUCED ALL OF TODAY'S FLARES, INCLUDING THE ONLY M-CLASS EVENT: AN
M1/SF AT 0546Z. THE GROUP SHOWED SLOW GROWTH TODAY, PRIMARILY BY
MEANS OF CONSOLIDATION OF THE LEADER PART OF THE GROUP INTO A
SINGLE, LARGE PENUMBRAL REGION. THE REGION PRODUCED FREQUENT
SUBFLARES THROUGHOUT THE DAY, 7 OF WHICH WERE LOW-LEVEL C-CLASS
EVENTS. IT WOULD APPEAR THAT THE STORAGE OF NON-POTENTIAL MAGNETIC
ENERGY IN THE REGION IS PROMPTLY DISSIPATED BY THESE FREQUENT SMALL
EVENTS. REGION 8419 (N26W65) DECREASED SLOWLY TODAY AND WAS VERY
STABLE. NEW REGION 8425 (S26E50) WAS ASSIGNED TODAY AND IS A SIMPLE,
SMALL, BIPOLAR SUNSPOT GROUP.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE. REGION 8421 IS EXPECTED TO BE THE SOURCE FOR ANY M-CLASS
ACTIVITY OVER THE NEXT THREE DAYS. THERE CONTINUES TO BE A CHANCE
FOR AN ISOLATED MAJOR FLARE EVENT FROM THIS REGION.
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET TO UNSETTLED. THE FIRST THREE
HOURS OF THE REPORTING PERIOD BEGAN WITH MOSTLY UNSETTLED CONDITIONS
WITH A FEW HIGH LATITUDE STATIONS REPORTING ACTIVE CONDITIONS.
CONDITIONS CALMED SLIGHTLY BETWEEN 0000-0700Z WITH ACTIVITY ON THE
BORDERLINE BETWEEN QUIET AND UNSETTLED. SINCE 0700Z, HOWEVER, THE
FIELD HAS BEEN VERY QUIET AT ALL LATITUDES. AN EXAMINATION OF THE
INTERPLANETARY MAGNETIC FIELD COMPONENT BZ SHOWED A NORTHWARD
TURNING OF THE FIELD TO ABOUT +5 NT AT 0500Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TOMORROW IN RESPONSE TO EFFECTS FROM A
FAVORABLY POSITIONED CORONAL HOLE. UNSETTLED CONDITIONS MAY LINGER
INTO THE EARLY PART OF THE SECOND DAY, BUT QUIET CONDITIONS SHOULD
PREVAIL FOR MOST OF THE SECOND AND THIRD DAYS.
III. Event Probabilities 31 DEC to 02 JAN
| Class M | 65% | 65% | 65% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 20% | 20% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 30 DEC 179 Predicted 31 DEC-02 JAN 172/165/160 90 Day Mean 30 DEC 136
V. Geomagnetic A Indices
OBSERVED AFR/AP 29 DEC 010/016 ESTIMATED AFR/AP 30 DEC 004/010 PREDICTED AFR/AP 31 DEC-02 JAN 010/010-007/010-005/007
VI. Geomagnetic Activity Probabilities 31 DEC to 02 JAN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 05% | 01% |
All times in UTC
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