Viewing archive of Sunday, 11 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 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 284 Issued at 2200Z on 11 OCT 1998IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS LOW. THERE WERE FIVE, LOW-LEVEL C
CLASS FLARES TODAY, TWO OF WHICH COULD BE ATTRIBUTED TO REGION 8356
(N21W42). THIS GROUP APPEARED TO BE IN DECAY TODAY. REGION 8355
(S22E10) CONTINUES TO BE THE LARGEST GROUP ON THE DISK, BUT WAS VERY
STABLE. REGION 8350 (N20W53) WAS IN DECAY DURING THE PAST 24 HOURS.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
FOR THE NEXT THREE DAYS. THERE IS LIKELY TO BE AN INCREASE IN
BACKGROUND FLUX LEVELS DUE TO THE POSSIBLE RETURN OF FIVE SPOTTED
REGIONS OVER THE NEXT THREE DAYS. OF THESE THE MOST NOTEWORTHY IS
OLD REGION 8340 (N20, L=013) WHICH PRODUCED 3 M-CLASS FLARES ON ITS
PREVIOUS DISK TRANSIT AND IS DUE TO RETURN EARLY ON THE 14TH.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE GREATER THAN 2 MEV
ELECTRON FLUX ATTAINED HIGH LEVELS DURING THE PAST 24 HOURS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED FOR THE NEXT THREE DAYS.
III. Event Probabilities 12 OCT to 14 OCT
| Class M | 05% | 10% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 OCT 119 Predicted 12 OCT-14 OCT 125/125/130 90 Day Mean 11 OCT 130
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 OCT 011/010 ESTIMATED AFR/AP 11 OCT 006/010 PREDICTED AFR/AP 12 OCT-14 OCT 005/010-005/010-005/010
VI. Geomagnetic Activity Probabilities 12 OCT to 14 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| 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% |
All times in UTC
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