Viewing archive of Sunday, 27 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 27 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 361 Issued at 2200Z on 27 DEC 1998IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z
SOLAR ACTIVITY WAS LOW. TODAY'S ACTIVITY WAS
CHARACTERIZED BY OCCASIONAL C-CLASS FLARES. THE LARGEST OF THESE WAS
A C7/SF FROM REGION 8419 (N27W27) AT 26/2344Z. REGION 8419 GREW
CONSIDERABLY OVER THE LAST 24 HOURS; THE PENUMBRA IN THE GROUP HAS
DEVELOPED AND MATURED AND OBSERVATIONS TOWARD THE END OF THE DAY
INDICATED THE PRESENCE OF A MAGNETIC DELTA CONFIGURATION IN THE
REGION. REGION 8421 (N27E26) SHOWED A LITTLE GROWTH AND OCCASIONAL
SUBFLARES DURING THE DAY. REGION 8422 (S23E38) PRODUCED A FEW
SUBFLARES BUT WAS ESSENTIALLY STABLE. BACKGROUND FLUX LEVELS FOR
X-RAYS AND 10.7 CM INCREASED DURING THE PAST 24 HOURS IN ASSOCIATION
WITH THE GROWTH OF REGION 8419.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. THERE IS A FAIR CHANCE FOR AN ISOLATED M-CLASS EVENT
FROM REGIONS 8419 AND 8421.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
THE GEOMAGNETIC FIELD WAS PREDOMINANTLY QUIET DURING THE PAST 24
HOURS. THERE WERE SOME UNSETTLED CONDITIONS BETWEEN 26/2100UT AND
27/0000UT, BUT THE FIELD HAS BEEN VERY QUIET FROM THE START OF THE
UT DAY (27/0000UT) TO THE END OF THE PERIOD (27/2100UT).
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS.
III. Event Probabilities 28 DEC to 30 DEC
| Class M | 50% | 50% | 50% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 27 DEC 167 Predicted 28 DEC-30 DEC 165/165/160 90 Day Mean 27 DEC 134
V. Geomagnetic A Indices
OBSERVED AFR/AP 26 DEC 012/016 ESTIMATED AFR/AP 27 DEC 005/007 PREDICTED AFR/AP 28 DEC-30 DEC 005/009-010/011-005/009
VI. Geomagnetic Activity Probabilities 28 DEC to 30 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 10% | 05% |
| Minor storm | 01% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 10% | 05% |
| Minor storm | 01% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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