Viewing archive of Saturday, 21 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 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 325 Issued at 2200Z on 21 NOV 1998IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z SOLAR ACTIVITY REMAINED AT LOW LEVELS. REGIONS 8384
(S26W75) AND 8391 (S17E21) EACH PRODUCED ISOLATED C-CLASS SUBFLARES.
NEITHER REGION SHOWED SIGNIFICANT CHANGES IN SIZE OR STRUCTURE
DURING THE DAY. NEW REGION 8392 (S22E74) WAS NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
AT LOW LEVELS.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN AT QUIET TO UNSETTLED LEVELS.
III. Event Probabilities 22 NOV to 24 NOV
| Class M | 20% | 20% | 20% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 21 NOV 121 Predicted 22 NOV-24 NOV 115/115/120 90 Day Mean 21 NOV 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 NOV 009/012 ESTIMATED AFR/AP 21 NOV 008/010 PREDICTED AFR/AP 22 NOV-24 NOV 005/010-005/010-010/015
VI. Geomagnetic Activity Probabilities 22 NOV to 24 NOV
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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