Viewing archive of Monday, 10 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 10 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 222 Issued at 2200Z on 10 AUG 1998IA. Analysis of Solar Active Regions and Activity from 09-2100Z to 10-2100Z SOLAR ACTIVITY WAS LOW. REGIONS 8293 (S23W30) AND 8299
(N15E40) PRODUCED SEVERAL LOW C-CLASS SUBFLARES. REGION 8293 DECAYED
IN SUNSPOT NUMBER BUT MAINTAINS MODERATE MAGNETIC COMPLEXITY IN A
BETA GAMMA CONFIGURATION. REGION 8299 SHOWED NO SIGNIFICANT CHANGE
IN SIZE OR STRUCTURE. BOTH REGIONS CONTINUE TO EXHIBIT FREQUENT
SURGING AND PLAGE FLUCTUATIONS. REGIONS 8297 (N32E22) AND 8298
(N19W24) PRODUCED SMALL SUBFLARES LATE IN THE PERIOD. NEITHER
REGION EXHIBITED SIGNIFICANT CHANGE IN THE PAST 24 HOURS AND
MAINTAIN SIMPLE MAGNETIC CONFIGURATION. THE REMAINING REGIONS HAVE
BEEN QUIET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGIONS 8293 AND 8299 ARE EXPECTED TO CONTINUE
PRODUCING FREQUENT C-CLASS ACTIVITY WITH A GOOD POSSIBILITY OF
ISOLATED M-CLASS.
IIA. Geophysical Activity Summary 09-2100Z to 10-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED WITH ISOLATED ACTIVE
PERIODS AT HIGH LATITUDES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN QUIET TO UNSETTLED WITH ISOLATED ACTIVE PERIODS
MOSTLY AT HIGH LATITUDES. ACTIVE CONDITIONS ARE EXPECTED ON 12 AUG
IN RESPONSE TO THE LARGE DSF/CME OBSERVED ON 08 AUG. QUIET TO
UNSETTLED CONDITIONS ARE EXPECTED TO RETURN BY 13 AUG.
III. Event Probabilities 11 AUG to 13 AUG
| Class M | 40% | 40% | 35% |
| Class X | 10% | 10% | 10% |
| Proton | 10% | 10% | 10% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 10 AUG 149 Predicted 11 AUG-13 AUG 150/150/145 90 Day Mean 10 AUG 111
V. Geomagnetic A Indices
OBSERVED AFR/AP 09 AUG 002/004 ESTIMATED AFR/AP 10 AUG 009/010 PREDICTED AFR/AP 11 AUG-13 AUG 012/015-025/025-015/015
VI. Geomagnetic Activity Probabilities 11 AUG to 13 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 40% | 20% |
| Minor storm | 10% | 25% | 10% |
| Major-severe storm | 01% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 50% | 25% |
| Minor storm | 15% | 35% | 15% |
| Major-severe storm | 05% | 10% | 05% |
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