Viewing archive of Thursday, 12 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 12 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 043 Issued at 2200Z on 12 FEB 1998IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z SOLAR ACTIVITY WAS VERY LOW. NUMEROUS B-CLASS X-RAY
BURSTS OCCURRED, FOUR OF WHICH WERE OPTICALLY ASSOCIATED WITH
SUBFLARES FROM REGION 8156 (S24E43). REGION 8156 CONTINUED TO
DISPLAY MINOR GROWTH IN SPOT COUNT AND FIELD INTENSITY. NO NEW
REGIONS WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW. REGION 8156 MAY PRODUCE C-CLASS SUBFLARES.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS DURING MOST OF
THE PERIOD. HOWEVER, FIELD ACTIVITY INCREASED TO ACTIVE TO MINOR
STORM LEVELS DURING 12/0000-0300UT AND 12/1100-1300UTWITH THE MINOR
STORM LEVELS LIMITED TO HIGH LATITUDES. THE GREATER THAN 2 MEV
ELECTRON FLUX REACHED HIGH LEVELS AT 12/1722UT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED DURING MOST OF THE PERIOD.
HOWEVER, ACTIVE PERIODS ARE POSSIBLE DURING THE LAST TWO DAYS OF THE
FORECAST PERIOD. THE GREATER THAN 2 MEV ELECTRON FLUX IS EXPECTED TO
BE AT MODERATE TO HIGH LEVELS.
III. Event Probabilities 13 FEB to 15 FEB
| Class M | 10% | 10% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 12 FEB 091 Predicted 13 FEB-15 FEB 094/094/094 90 Day Mean 12 FEB 096
V. Geomagnetic A Indices
OBSERVED AFR/AP 11 FEB 010/013 ESTIMATED AFR/AP 12 FEB 010/010 PREDICTED AFR/AP 13 FEB-15 FEB 010/010-010/008-010/008
VI. Geomagnetic Activity Probabilities 13 FEB to 15 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 20% |
| Minor storm | 01% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 25% | 25% |
| Minor storm | 01% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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