Viewing archive of Sunday, 25 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 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
***************CORRECTED COPY***************** SDF Number 298 Issued at 2200Z on 25 OCT 1998IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z SOLAR ACTIVITY WAS LOW, BASED ON A SINGLE C2/SF X-RAY
EVENT FROM REGION 8366 (S12W54). NEW REGIONS 8368 (N26W24), 8369
(N17E59), AND 8370 (S31W67), WERE NUMBERED TODAY. TWO PROMINENCES
ARE CURRENTLY ACTIVE ON THE EAST LIMB, ONE AT N39 WITH AN EXTENT OF
0.07RV, AND THE OTHER AT S20 WITH AN EXTENT OF 0.09RV. THE
REMAINDER OF THE DISK AND LIMBS HAS BEEN QUIET AND UNREMARKABLE.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW,
WITH CONTINUED C-CLASS X-RAY ACTIVITY PROBABLE FROM REGION 8369.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD HAS BEEN MOSTLY UNSETTLED FOR THE PAST 24
HOURS, WITH ISOLATED PERIODS OF ACTIVE TO MINOR STORM CONDITIONS
RECORDED DURING THE INTERVAL 25/0300-0900Z. THE GREATER THAN 2 MEV
ELECRON FLUX CONTINUES IN THE HIGH RANGE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS.
III. Event Probabilities 26 OCT to 28 OCT
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 OCT 108 Predicted 26 OCT-28 OCT 110/110/112 90 Day Mean 25 OCT 131
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 OCT 011/013 ESTIMATED AFR/AP 25 OCT 012/012 PREDICTED AFR/AP 26 OCT-28 OCT 010/010-010/008-010/010
VI. Geomagnetic Activity Probabilities 26 OCT to 28 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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