Viewing archive of Thursday, 21 May 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 May 21 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 141 Issued at 2200Z on 21 MAY 1998IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z
SOLAR ACTIVITY WAS VERY LOW. ONLY TWO SPOTTED REGIONS,
8220 (S26W60) AND 8222 (N23W52) ARE VISIBLE ON A VERY QUIET DISK. NO
CME OR FLARE ACTIVITY WAS REPORTED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO ACTIVE. SHORT-LIVED SUBSTORMS
OCCURRED IN LOCAL MIDNIGHT SECTORS. THE ENERGETIC ELECTRON FLUX
AT GEOSYNCHRONOUS ORBIT ATTAINED HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO PERSIST AT UNSETTLED TO MILDLY ACTIVE LEVELS FOR THE
NEXT 24 HOURS. STRICTLY UNSETTLED CONDITIONS SHOULD PREVAIL THE LAST
2 DAYS OF THE FORECAST PERIOD.
III. Event Probabilities 22 MAY to 24 MAY
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 21 MAY 089 Predicted 22 MAY-24 MAY 087/085/085 90 Day Mean 21 MAY 109
V. Geomagnetic A Indices
OBSERVED AFR/AP 20 MAY 008/009 ESTIMATED AFR/AP 21 MAY 015/015 PREDICTED AFR/AP 22 MAY-24 MAY 015/015-010/010-010/010
VI. Geomagnetic Activity Probabilities 22 MAY to 24 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 05% |
All times in UTC
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