Viewing archive of Wednesday, 18 February 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 Feb 18 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 049 Issued at 2200Z on 18 FEB 1998IA. Analysis of Solar Active Regions and Activity from 17-2100Z to 18-2100Z SOLAR ACTIVITY WAS LOW. REGION 8156 (S25W34), CURRENTLY
A 16-SPOT 'EHI' BETA-GAMMA, GENERATED THREE C-CLASS EVENTS DURING
THE PAST 24 HOURS, THE LARGEST A C5/1F AT 18/1138Z.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW, WITH A GOOD PROBABILITY FOR CONTINUED C-CLASS ACTIVITY FROM
REGION 8156.
IIA. Geophysical Activity Summary 17-2100Z to 18-2100Z
THE GEOMAGNETIC FIELD HAS BEEN MOSTLY UNSETTLED TO ACTIVE DURING THE
PAST 24 HOURS, WITH AN ISOLATED PERIOD OF MINOR TO MAJOR STORMING
RECORDED DURING THE INTERVAL 18/0000-0300Z. THIS DISTURBANCE IS
THOUGHT TO BE RELATED TO THE CORONAL MASS EJECTION ACTIVITY OF 14
FEBRUARY.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT 12 HOURS, AND MOSTLY
QUIET THEREAFTER FOR THE REMAINDER OF THE FORECAST PERIOD.
III. Event Probabilities 19 FEB to 21 FEB
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 18 FEB 103 Predicted 19 FEB-21 FEB 105/103/100 90 Day Mean 18 FEB 096
V. Geomagnetic A Indices
OBSERVED AFR/AP 17 FEB 012/014 ESTIMATED AFR/AP 18 FEB 022/025 PREDICTED AFR/AP 19 FEB-21 FEB 008/008-005/005-005/008
VI. Geomagnetic Activity Probabilities 19 FEB to 21 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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