Viewing archive of Monday, 25 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 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 145 Issued at 2200Z on 25 MAY 1998IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY DECLINED TO VERY LOW LEVELS. ISOLATED,
B-CLASS X-RAY BURSTS OCCURRED. REGION 8226 (N18W38) STABILIZED AS A
SMALL D-TYPE GROUP WITH MINOR MAGNETIC COMPLEXITY AFTER TWO DAYS OF
GRADUAL GROWTH . OLD REGION 8214 MADE AN UNEVENTFUL RETURN TO THE
VISIBLE DISK AND WAS ASSIGNED SWO NUMBER 8227 (N25E73).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS FORECAST TO BE VERY
LOW TO LOW. REGION 8226 MAY PRODUCE ISOLATED C-CLASS FLARES.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
GEOMAGNETIC FIELD ACTIVITY RANGED FROM QUIET TO ACTIVE LEVELS AT ALL
LATITUDES. BRIEF MINOR TO MAJOR STORM PERIODS ALSO OCCURRED AT HIGH
LATITUDES DURING LOCAL NIGHTIMES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED THROUGHOUT THE PERIOD.
III. Event Probabilities 26 MAY to 28 MAY
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 MAY 092 Predicted 26 MAY-28 MAY 094/094/096 90 Day Mean 25 MAY 108
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 MAY 015/016 ESTIMATED AFR/AP 25 MAY 010/015 PREDICTED AFR/AP 26 MAY-28 MAY 010/010-007/008-007/008
VI. Geomagnetic Activity Probabilities 26 MAY to 28 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 15% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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