Viewing archive of Wednesday, 25 November 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 Nov 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 329 Issued at 2200Z on 25 NOV 1998IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY WAS AT LOW LEVELS. REGION 8395 (N17E68)
PRODUCED A C8/1F FLARE AT 24/2215Z WITH AN ASSOCIATED TYPE II SWEEP.
THE TYPE II SPEED WAS ESTIMATED AT 800 KM/S. AN OPTICALLY
UNCORRELATED C6 X-RAY FLARE OCCURRED AT 25/1403Z WITH AN ASSOCIATED
TYPE II SWEEP; THE SPEED WAS ESTIMATED AT 1000 KM/S. BOTH REGIONS
8395 AND 8393 (S18E50) PRODUCED NUMEROUS LOW LEVEL C-CLASS X-RAY
FLARES. OBSERVATIONS REPORTED MORE SPOTS ROTATING INTO VIEW ON THE
EAST LIMB NEAR N17. IT IS POSSIBLE A SEPARATE REGION IS ROTATING ON
IMMEDIATELY BEHIND REGION 8395.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS FLARES ARE EXPECTED WITH A POSSIBILITY OF A
M-CLASS FLARE FROM THE MORE ACTIVE REGIONS IN THE EAST.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH ISOLATED ACTIVE CONDITIONS
POSSIBLE.
III. Event Probabilities 26 NOV to 28 NOV
| Class M | 40% | 40% | 40% |
| Class X | 01% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 NOV 150 Predicted 26 NOV-28 NOV 155/160/165 90 Day Mean 25 NOV 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 NOV 011/012 ESTIMATED AFR/AP 25 NOV 010/012 PREDICTED AFR/AP 26 NOV-28 NOV 010/009-010/009-010/009
VI. Geomagnetic Activity Probabilities 26 NOV to 28 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 35% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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