Viewing archive of Wednesday, 16 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 16 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 259 Issued at 2200Z on 16 SEP 1998IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z SOLAR ACTIVITY HAS BEEN VERY LOW FOR THE PAST 24 HOURS.
THREE NEW REGIONS WERE NUMBERED: REGION 8336 (S30E52), REGION 8337
(S39E42), AND REGION 8338 (N31E81). ALL ARE MAGNETICALLY SIMPLE.
SURGING WAS REPORTED ON THE WEST LIMB NEAR DEPARTED REGIONS 8326
(N18) AND 8334 (S24), AND ON THE EAST LIMB NEAR N41. THE REMAINDER
OF THE LIMB AND THE NUMBERED REGIONS ON THE DISK WERE QUIET OR
UNREMARKABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
BASED UPON REGIONS PRESENTLY VISIBLE. HOWEVER, RETURNING REGIONS OR
DEVELOPMENT IN REGIONS NOW ON THE DISK COULD PROVIDE OPPORTUNITY FOR
ISOLATED M-CLASS FLARES OVER THE FORECAST PERIOD.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET FOR THE PAST 24 HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO PERSIST AT QUIET LEVELS TOMORROW, BECOMING UNSETTLED TO
OCCASIONALLY ACTIVE BY THE END OF THE FORECAST PERIOD DUE TO
POSSIBLE EFFECTS FROM A CORONAL HOLE AND SEVERAL SMALL FILAMENT
DISAPPEARANCES BETWEEN SEPTEMBER 11-13.
III. Event Probabilities 17 SEP to 19 SEP
| Class M | 15% | 15% | 15% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 16 SEP 119 Predicted 17 SEP-19 SEP 125/130/135 90 Day Mean 16 SEP 126
V. Geomagnetic A Indices
OBSERVED AFR/AP 15 SEP 005/007 ESTIMATED AFR/AP 16 SEP 005/010 PREDICTED AFR/AP 17 SEP-19 SEP 005/010-010/012-010/012
VI. Geomagnetic Activity Probabilities 17 SEP to 19 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 30% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 05% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 05% | 05% |
All times in UTC
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