Viewing archive of Friday, 7 August 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 Aug 07 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 219 Issued at 2200Z on 07 AUG 1998IA. Analysis of Solar Active Regions and Activity from 06-2100Z to 07-2100Z SOLAR ACTIVITY CONTINUED LOW. THE DAY'S LARGEST FLARE
WAS A C4/SF AT 0722Z FROM REGION 8293 (S22E09). FIVE OTHER REGIONS
CONTRIBUTED SMALL FLARES DURING THE PERIOD, INCLUDING A C2/SF WITH
TYPE II SWEEP AT 1431Z FROM REGION 8296 (N16E44). THE DISK NUMBERS
SEVEN SPOTTED REGIONS, WITH 8293 STILL THE MOST IMPRESSIVE IN WHITE
LIGHT AND H-ALPHA. ITS MAGNETIC CONFIGURATION SIMPLIFIED SLIGHTLY
DURING THE PAST 24 HOURS, BUT POINT BRIGHTENINGS AND ARCH FILAMENTS
PERSIST. TWO NEW REGIONS WERE ASSIGNED; 8298 (N19E16) AND 8299
(N17E74).
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO PERSIST
AT LOW LEVELS. AN ISOLATED M-CLASS EVENT IS POSSIBLE FROM REGION
8293.
IIA. Geophysical Activity Summary 06-2100Z to 07-2100Z
THE GEOMAGNETIC FIELD WAS AT UNSETTLED TO ACTIVE CONDITIONS AT MIDDLE
LATITUDES, AND UNSETTLED TO MAJOR STORM CONDITIONS AT HIGH
LATITUDES. YESTERDAY'S DISTURBANCE DECLINED DURING THE PERIOD, WITH
THE STRONGEST ACTIVITY OCCURRING DURING LOCAL NIGHTTIMES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE UNSETTLED TO ACTIVE DURING THE NEXT 24 HOURS. QUIET
TO UNSETTLED CONDITIONS SHOULD PREVAIL THE LAST TWO DAYS OF THE
FORECAST PERIOD.
III. Event Probabilities 08 AUG to 10 AUG
| Class M | 25% | 25% | 25% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 07 AUG 145 Predicted 08 AUG-10 AUG 150/150/145 90 Day Mean 07 AUG 110
V. Geomagnetic A Indices
OBSERVED AFR/AP 06 AUG 043/069 ESTIMATED AFR/AP 07 AUG 018/039 PREDICTED AFR/AP 08 AUG-10 AUG 010/018-005/010-005/008
VI. Geomagnetic Activity Probabilities 08 AUG to 10 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 10% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 20% | 10% |
| Minor storm | 20% | 10% | 05% |
| Major-severe storm | 05% | 05% | 05% |
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