Viewing archive of Wednesday, 11 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 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 042 Issued at 2200Z on 11 FEB 1998IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS VERY LOW. REGION 8156 (S24E56) GREW
SLIGHTLY AND PRODUCED ISOLATED SUBFLARES. NEW REGIONS 8157 (N28E66)
AND 8158 (S19E77) WERE NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
VERY LOW WITH A SMALL CHANCE FOR AN ISOLATED C-CLASS SUBFLARE.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS DURING MOST OF
THE PERIOD. HOWEVER, ACTIVITY INCREASED DURING 10/0200 - 0300UT WITH ACTIVE
LEVELS DETECTED AT ALL LATITUDES, AND AGAIN DURING 10/1300 - 1500UT
WITH ACTIVE LEVELS DETECTED AT MIDDLE LATITUDES AND ACTIVE TO MAJOR
STORM LEVELS AT HIGH LATITUDES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO UNSETTLED LEVELS. THERE IS A SMALL CHANCE
FOR ACTIVE LEVELS ON THE FINAL DAY OF THE FORECAST PERIOD.
III. Event Probabilities 12 FEB to 14 FEB
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 FEB 086 Predicted 12 FEB-14 FEB 086/086/086 90 Day Mean 11 FEB 096
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 FEB 006/008 ESTIMATED AFR/AP 11 FEB 010/010 PREDICTED AFR/AP 12 FEB-14 FEB 007/008-007/008-010/007
VI. Geomagnetic Activity Probabilities 12 FEB to 14 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 01% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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