Viewing archive of Thursday, 8 October 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 Oct 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 281 Issued at 2200Z on 08 OCT 1998IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z SOLAR ACTIVITY WAS LOW. REGION 8355 (S22E51) PRODUCED
THREE C-CLASS X-RAY EVENTS. A C4 OCCURRED AT 08/0837Z ACCOMPANIED BY
A TYPE II RADIO SWEEP AND A 245MHZ BURST OF 5100SFU. THIS EVENT WAS
NOT OPTICALLY CORRELATED. REGION 8356 (N21W04) WAS NUMBERED TODAY.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8355 REMAINS CAPABLE OF PRODUCING ISOLATED
M-CLASS ACTIVITY THROUGH THE FORECAST PERIOD.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
THE GEOMAGNETIC FIELD HAS BEEN AT QUIET TO MINOR STORM LEVELS WITH
ISOLATED MAJOR STORM LEVELS AT HIGH LATITUDES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH OCCASIONAL ACTIVE
CONDITIONS ON THE THIRD DAY OF THE FORECAST PERIOD.
III. Event Probabilities 09 OCT to 11 OCT
| Class M | 65% | 65% | 65% |
| Class X | 10% | 10% | 10% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 08 OCT 124 Predicted 09 OCT-11 OCT 125/130/130 90 Day Mean 08 OCT 129
V. Geomagnetic A Indices
OBSERVED AFR/AP 07 OCT 016/020 ESTIMATED AFR/AP 08 OCT 018/020 PREDICTED AFR/AP 09 OCT-11 OCT 010/010-005/010-005/018
VI. Geomagnetic Activity Probabilities 09 OCT to 11 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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