Viewing archive of Saturday, 30 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 30 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 150 Issued at 2200Z on 30 MAY 1998IA. Analysis of Solar Active Regions and Activity from 29-2100Z to 30-2100Z SOLAR ACTIVITY WAS LOW. 2 C-CLASS FLARES OCCURRED EARLY
IN THE PERIOD, AT 30/2119Z AND 2340Z. 2 NEW REGIONS WERE NUMBERED.
RGN 8031 (S21E33) WITH A "BXO-BETA" SPOT GROUP AND RGN 8030 (S19E60)
WITH A "CSO-BETA" SPOT GROUP. RGN 8030 PRODUCED A C3/SF AT 30/2340Z.
RGN 8227 IS SHOWING A 6-SPOT "CAO-BETA" SPOT GROUP AND VERY LITTLE
REPORTED ACTIVITY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
ISOLATED C-CLASS FLARES ARE POSSIBLE FROM REGIONS 8227 AND 8230.
IIA. Geophysical Activity Summary 29-2100Z to 30-2100Z
GEOPHYSICAL ACTIVITY WAS QUIET TO MINOR STORMS LEVELS. THE GREATER
THAN 2 MEV FLUX HAS SHOWN STEADY ENHANCEMENT DURING THE DAY AND HAS
REMAINED AT NEAR THRESHOLD LEVELS SINCE APPROXIMATELY 30/1900Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 31 MAY to 02 JUN
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 30 MAY 096 Predicted 31 MAY-02 JUN 096/096/096 90 Day Mean 30 MAY 108
V. Geomagnetic A Indices
OBSERVED AFR/AP 29 MAY 021/019 ESTIMATED AFR/AP 30 MAY 022/022 PREDICTED AFR/AP 31 MAY-02 JUN 015/015-010/013-007/010
VI. Geomagnetic Activity Probabilities 31 MAY to 02 JUN
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 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 | 05% | 01% | 01% |
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