Viewing archive of Sunday, 22 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 22 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 053 Issued at 2200Z on 22 FEB 1998IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z SOLAR ACTIVITY INCREASED TO LOW LEVELS WITH A OPTICALLY
UNCORRELATED C-CLASS X-RAY BURST DETECTED LATE IN THE PERIOD. REGION
8156 (S25W89) WAS STABLE AS IT APPROACHED THE WEST LIMB. 8158
(S20W69) GREW FROM PLAGE TO A SMALL B-CLASS GROUP AS SEVERAL SPOTS
EMERGED. NEW REGION 8163 (S22W28), A SMALL B-CLASS GROUP, WAS
NUMBERED. FURTHER ANALYSIS OF THE CORONAL MASS EJECTION (CME)
DESCRIBED IN YESTERDAY'S REPORT INDICATED THE CME WAS LIKELY
NON-EARTH DIRECTED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW. HOWEVER, THERE IS A FAIR CHANCE FOR A C-CLASS FLARE FROM REGION
8156 AS IT ROUNDS THE LIMB TOMORROW.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
THE GEOMAGNETIC FIELD WAS QUIET AT ALL LATITUDES. THE GREATER THAN 2
MEV ELECTRON FLUX REACHED HIGH LEVELS LATE IN THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET THROUGH 23 FEBRUARY. ACTIVITY IS FORECAST TO
INCREASE DURING 24 - 25 FEBRUARY WITH MOSTLY UNSETTLED CONDITIONS
EXPECTED.
III. Event Probabilities 23 FEB to 25 FEB
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 22 FEB 096 Predicted 23 FEB-25 FEB 094/092/090 90 Day Mean 22 FEB 096
V. Geomagnetic A Indices
OBSERVED AFR/AP 21 FEB 002/004 ESTIMATED AFR/AP 22 FEB 004/008 PREDICTED AFR/AP 23 FEB-25 FEB 005/005-010/008-010/015
VI. Geomagnetic Activity Probabilities 23 FEB to 25 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 30% | 30% |
| Minor storm | 05% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 35% | 35% |
| Minor storm | 05% | 15% | 15% |
| Major-severe storm | 01% | 01% | 01% |
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