Viewing archive of Monday, 28 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 28 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 362 Issued at 2200Z on 28 DEC 1998IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8419 (N26W40)
PRODUCED AN M3/1B FLARE AT 0548UT. THIS GROUP HAS CONTINUED TO GROW
RAPIDLY, NEARLY DOUBLING IN SIZE OVER THE LAST 24 HOURS. THE SPOTS
ARE RATHER COMPACT AND SHOW THE PRESENCE OF A MAGNETIC DELTA
CONFIGURATION. THE GROUP ALSO PRODUCED NUMEROUS C-CLASS FLARES
DURING THE REPORTING PERIOD. REGION 8421 (N26E13) PRODUCED AN M1/SF
AT 0521Z. THIS REGION CONTINUES TO BE LARGE AND MAGNETICALLY
COMPLEX, ALTHOUGH REGION 8421'S GROWTH RATE IS MUCH SLOWER THAN THAT
OF REGION 8419.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE
MODERATE DUE TO THE LIKELIHOOD OF AN M-CLASS FLARE FROM EITHER
REGION 8419 OR 8421. THERE IS A SLIGHT CHANCE FOR A MAJOR FLARE
EVENT FROM THESE REGIONS.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET FOR THE PAST 24 HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TOMORROW AND QUIET TO UNSETTLED FOR THE
SECOND AND THIRD DAYS.
III. Event Probabilities 29 DEC to 31 DEC
| Class M | 70% | 70% | 70% |
| Class X | 15% | 15% | 15% |
| Proton | 15% | 15% | 15% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 28 DEC 184 Predicted 29 DEC-31 DEC 185/180/175 90 Day Mean 28 DEC 134
V. Geomagnetic A Indices
OBSERVED AFR/AP 27 DEC 001/003 ESTIMATED AFR/AP 28 DEC 003/009 PREDICTED AFR/AP 29 DEC-31 DEC 010/011-005/009-005/009
VI. Geomagnetic Activity Probabilities 29 DEC to 31 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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