Viewing archive of Saturday, 31 January 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 Jan 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 031 Issued at 2200Z on 31 JAN 1998IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z SOLAR ACTIVITY WAS VERY LOW. NO FLARES OCCURRED, AS THE
VISIBLE DISK REMAINS QUIET AND STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
THE GEOMAGNETIC FIELD WAS QUIET UNTIL AN ISOLATED DISTURBANCE HIT AT
APPROXIMATELY 31/1530Z, CAUSING ACTIVITY TO INCREASE TO UNSETTLED
(31/1500-1800Z) AND THEN ACTIVE (31/1800-2100Z). THIS DISTURBANCE
COINCIDED WITH AN ABRUPT RISE IN THE SOLAR WIND VELOCITY
(~350 TO 450 KM/S) AND DENSITY (~5-23 P/CC). THE GREATER THAN 2 MEV
ELECTRON FLUX WAS ABOVE THE HIGH THRESHOLD FOR APPROXIMATELY ONE
HALF HOUR STARTING AT 31/1801Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY QUIET FOR THE NEXT THREE DAYS.
III. Event Probabilities 01 FEB to 03 FEB
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 31 JAN 089 Predicted 01 FEB-03 FEB 087/087/087 90 Day Mean 31 JAN 097
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 JAN 012/019 ESTIMATED AFR/AP 31 JAN 010/010 PREDICTED AFR/AP 01 FEB-03 FEB 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 01 FEB to 03 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% |
All times in UTC
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