Viewing archive of Friday, 25 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 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 359 Issued at 2200Z on 25 DEC 1998IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY WAS MODERATE. REGION 8421 (N28E53)
PRODUCED SEVERAL C-CLASS EVENTS DURING THE PERIOD AND A M1/SF AT
25/0634Z. THERE WERE TWO OPTICALLY UNCORRELATED EVENTS, A C2 AT
25/0414Z AND A C1 AT 25/2020Z.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE THROUGH THE PERIOD. REGION 8421 REMAINS CAPABLE OF
PRODUCING OCCASIONAL M-CLASS EVENTS.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. THE FIELD WAS EFFECTED
SLIGHTLY BY A TRANSIENT SIGNATURE FROM AN UNKNOWN SOURCE. THIS WAS
REFLECTED IN THE SOLAR WIND DATA (SPEED INCREASED WHILE DENSITY
DECREASED) AT 25/0535Z RECEIVED FROM THE ACE SPACECRAFT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO SLIGHTLY UNSETTLED FOR THE FORECAST PERIOD.
III. Event Probabilities 26 DEC to 28 DEC
| Class M | 40% | 40% | 40% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 DEC 144 Predicted 26 DEC-28 DEC 150/154/158 90 Day Mean 25 DEC 133
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 DEC 004/003 ESTIMATED AFR/AP 25 DEC 010/010 PREDICTED AFR/AP 26 DEC-28 DEC 005/009-005/009-005/009
VI. Geomagnetic Activity Probabilities 26 DEC to 28 DEC
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
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