Viewing archive of Saturday, 3 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 03 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 276 Issued at 2200Z on 03 OCT 1998IA. Analysis of Solar Active Regions and Activity from 02-2100Z to 03-2100Z SOLAR ACTIVITY REMAINED VERY LOW. ONLY MINOR B-CLASS
ENHANCEMENTS WERE OBSERVED. REGION 8350 (N19E55) WAS GENERALLY
STABLE. SLIGHT MAGNETIC POLARITY MIXING BECAME EVIDENT DURING THE
PERIOD. A MODERATE SIZE FILAMENT LOCATED FROM N51E35-N48E57 FADED
BETWEEN 03/0253-0849Z.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD REMAIN
PREDOMINANTLY VERY LOW FOR THE NEXT THREE DAYS. REGION 8350 IS
CAPABLE OF PRODUCING AN ISOLATED C-CLASS FLARE.
IIA. Geophysical Activity Summary 02-2100Z to 03-2100Z
THE GEOMAGNETIC FIELD WAS AT UNSETTLED TO ACTIVE LEVELS FOR THE FIRST
HALF OF THE PERIOD. ISOLATED MINOR STORMING WAS OBSERVED DURING THAT
TIME. DURING THE LATTER HALF OF THE PERIOD, THE FIELD WAS QUIET TO
UNSETTLED. SOLAR WIND VELOCITY FELL STEADILY THROUGH THE PERIOD FROM
ABOUT 650 KM/S TO APPROXIMATELY 500 KM/S. IT APPEARS THAT THE
DISTURBANCE EXPECTED TO ARRIVE ON 03 OCT, ACTUALLY ARRIVED ON 02 OCT
NEAR 0700Z. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT
REACHED HIGH LEVELS DURING THE PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE
QUIET TO UNSETTLED FOR THE NEXT THREE DAYS.
III. Event Probabilities 04 OCT to 06 OCT
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 05% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 03 OCT 112 Predicted 04 OCT-06 OCT 111/110/111 90 Day Mean 03 OCT 129
V. Geomagnetic A Indices
OBSERVED AFR/AP 02 OCT 027/021 ESTIMATED AFR/AP 03 OCT 017/020 PREDICTED AFR/AP 04 OCT-06 OCT 008/015-008/010-008/008
VI. Geomagnetic Activity Probabilities 04 OCT to 06 OCT
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 10% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 05% | 01% |
All times in UTC
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