Viewing archive of Friday, 22 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 22 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 142 Issued at 2200Z on 22 MAY 1998IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z SOLAR ACTIVITY WAS VERY LOW. LITTLE OF SIGNIFICANCE
OCCURRED AS THE TWO ASSIGNED SPOTTED REGIONS, 8220 (S24W72) AND 8222
(N24W64) CONTINUED THEIR SLOW DECAY. THERE ARE PRELIMINARY REPORTS
OF SPOTS NEAR S18E74, MARKING THE RETURN OF OLD REGION 8210 (S17,
L-136). THAT REGION PRODUCED SIGNIFICANT ACTIVITY (X-CLASS FLARES,
PROTON EVENTS) LAST ROTATION. ITS RETURN TO THE DISK WAS QUIET AND
UNEVENTFUL.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. ENERGETIC ELECTRON FLUX
AT GEOSYNCHRONOUS ORBIT WAS AGAIN AT HIGH LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO PERSIST AT QUIET TO UNSETTLED LEVELS THROUGHOUT THE
FORECAST PERIOD.
III. Event Probabilities 23 MAY to 25 MAY
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 22 MAY 087 Predicted 23 MAY-25 MAY 085/085/090 90 Day Mean 22 MAY 109
V. Geomagnetic A Indices
OBSERVED AFR/AP 21 MAY 14 (EST.)/014 ESTIMATED AFR/AP 22 MAY 007/008 PREDICTED AFR/AP 23 MAY-25 MAY 010/010-010/010-005/010
VI. Geomagnetic Activity Probabilities 23 MAY to 25 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 10% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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