Viewing archive of Tuesday, 29 September 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 Sep 29 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 272 Issued at 2200Z on 29 SEP 1998IA. Analysis of Solar Active Regions and Activity from 28-2100Z to 29-2100Z SOLAR ACTIVITY WAS LOW. A C6/SF FLARE OCCURRED IN
REGION 8340 (N19W82) AT 29/0154UT. A BRIGHT SURGE ON THE LIMB
OCCURRED AT 0945UT FROM REGION 8339 (S12W90). A DISAPPEARING
FILAMENT OCCURRED FROM REGION 8345 (N22W71) EARLY IN THE PERIOD, BUT
HAS REGAINED MASS AND FORM AS THE PERIOD PROGRESSED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW TO LOW.
IIA. Geophysical Activity Summary 28-2100Z to 29-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET TO UNSETTLED. ENERGETIC
ELECTRONS HAVE REMAINED AT HIGH LEVELS THROUGHOUT THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO QUIET TO UNSETTLED THROUGHOUT THE PERIOD. ENERGETIC
ELECTRONS WILL REMAIN AT MODERATE TO HIGH LEVELS OVER THE NEXT
SEVERAL DAYS.
III. Event Probabilities 30 SEP to 02 OCT
| Class M | 40% | 40% | 25% |
| Class X | 05% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 29 SEP 116 Predicted 30 SEP-02 OCT 114/118/122 90 Day Mean 29 SEP 129
V. Geomagnetic A Indices
OBSERVED AFR/AP 28 SEP 004/006 ESTIMATED AFR/AP 29 SEP 007/010 PREDICTED AFR/AP 30 SEP-02 OCT 008/008-008/012-010/008
VI. Geomagnetic Activity Probabilities 30 SEP to 02 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 11% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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