Viewing archive of Wednesday, 13 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 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 133 Issued at 2200Z on 13 MAY 1998IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z SOLAR ACTIVITY WAS LOW DUE TO A C1/SF FLARE AT 13/1452Z
IN REGION 8218 (S20W18). THIS REGION HAS CHANGED LITTLE SINCE
YESTERDAY. REGION 8222 (N22E48) HAS GROWN IN SUNSPOT AREA AND NUMBER
BUT HAS NOT PRODUCED ANY SIGNIFICANT FLARES. REGION 8220 (S28E46),
THE ONLY OTHER SUNSPOT GROUP OF NOTE, HAS BEEN RELATIVELY STABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
C-CLASS ACTIVITY IS POSSIBLE IN REGIONS 8218, 8220, AND 8222. THE
MOST LIKELY SOURCES OF ISOLATED M-CLASS ACTIVITY ARE REGIONS 8218
AND 8220; HOWEVER, THE THREAT DOES NOT APPEAR IMMINENT.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE GREATER THAN 2 MEV
ELECTRON FLUX WAS MODERATE TO HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 14 MAY to 16 MAY
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 13 MAY 117 Predicted 14 MAY-16 MAY 120/120/120 90 Day Mean 13 MAY 108
V. Geomagnetic A Indices
OBSERVED AFR/AP 12 MAY 017/019 ESTIMATED AFR/AP 13 MAY 005/012 PREDICTED AFR/AP 14 MAY-16 MAY 010/012-010/010-010/010
VI. Geomagnetic Activity Probabilities 14 MAY to 16 MAY
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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