Viewing archive of Sunday, 31 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 31 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 151 Issued at 2200Z on 31 MAY 1998IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z SOLAR ACTIVITY WAS LOW. ONLY A SINGLE C-CLASS FLARE
OCCURRED TODAY; A C2 AT 31/0515Z. REGION 8227 (N26W04) HAS SHOWN
LITTLE CHANGE OR ACTIVITY. REGION 8230 (S20E48) PRODUCED A B4/SF AT
31/1805Z AND HAS INCREASED ITS SPOT COUNT FROM 7 TO 13 IN A
"DSO-BETA" GROUP.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW. ISOLATED C-CLASS FLARES ARE POSSIBLE FROM REGION 8230.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
GEOPHYSICAL ACTIVITY WAS QUIET. THE GREATER THAN 2 MEV FLUX
APPROACHED NEAR THRESHOLD LEVEL (1000PFU) AT 31/2000Z AND HAS
REMAINED THERE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET.
III. Event Probabilities 01 JUN to 03 JUN
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 31 MAY 094 Predicted 01 JUN-03 JUN 096/096/098 90 Day Mean 31 MAY 108
V. Geomagnetic A Indices
OBSERVED AFR/AP 30 MAY 020/025 ESTIMATED AFR/AP 31 MAY 007/010 PREDICTED AFR/AP 01 JUN-03 JUN 007/010-007/010-007/010
VI. Geomagnetic Activity Probabilities 01 JUN to 03 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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