Viewing archive of Saturday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 269 Issued at 2200Z on 26 SEP 1998IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY WAS VERY LOW TO LOW. SEVERAL SMALL
C-CLASS X-RAY AND SUB-FAINT FLARES OCCURRED FROM REGION 8340
(N21W40). A LARGE NUMBER OF FILAMENTS ARE ALSO ASSOCIATED WITH THIS
REGION.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
WITH A POSSIBILITY OF ISOLATED M-CLASS FLARES.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD WAS MOSTLY QUIET TO UNSETTLED WITH A SINGLE
ACTIVE PERIOD. THE ACTIVE PERIOD CORRESPONDED TO AN INCREASE IN
SOLAR WIND SPEED AND TEMPERATURE AND A DECREASE IN DENSITY (A
CORONAL HOLE EFFECT). HIGH LATITUDES EXPERIENCED ADDITIONAL
ISOLATED ACTIVE PERIODS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH ISOLATED ACTIVE PERIODS IN
THE HIGHER LATITUDES.
III. Event Probabilities 27 SEP to 29 SEP
| Class M | 30% | 30% | 30% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 SEP 136 Predicted 27 SEP-29 SEP 138/138/140 90 Day Mean 26 SEP 129
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 SEP 059/121 ESTIMATED AFR/AP 26 SEP 010/015 PREDICTED AFR/AP 27 SEP-29 SEP 008/015-005/015-005/010
VI. Geomagnetic Activity Probabilities 27 SEP to 29 SEP
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 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 | 01% | 01% | 01% |
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