Viewing archive of Sunday, 8 August 1999
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 1999 Aug 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 220 Issued at 2200Z on 08 AUG 1999IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z SOLAR ACTIVITY WAS MODERATE. AN OPTICALLY UNCORRELATED
M1 X-RAY BURST OCCURRED AT 07/2105Z. A CORONAL MASS EJECTION
OBSERVED OFF THE SW LIMB AT THE SAME TIME AS THE M1 EVENT SUGGEST
EITHER OLD REGION 8645 (S28, L=239), OR REGION 8647 (S19, L=247) AS
THE LIKELY SOURCE REGION. REGION 8662 (S16E35) PRODUCED SEVERAL
MINOR C-CLASS SUBFLARES AND CONTINUES TO EXHIBIT SLOW GROWTH. A
C3/SF WITH A SMALL ERUPTIVE FILAMENT AND MINOR CENTIMETRIC BURSTS
OCCURRED IN REGION 8657 (S31W09) AT 07/2318Z. THE COMPLEX REGION
8651 (N26W82) IS MAKING A RELATIVELY QUIET TRANSIT AROUND THE WEST
LIMB. NEW REGION 8664 (N23E15) WAS NUMBERED TODAY. REMAINING GROUPS
WERE MOSTLY QUIET.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. CONTINUED C-CLASS ACTIVITY IS EXPECTED FROM REGION 8657
AND 8662 WITH A SLIGHT CHANCE OF AN M-CLASS EVENT. AN ISOLATED
M-CLASS EVENT FROM REGIONS ON OR AROUND THE WEST LIMB IS STILL
POSSIBLE.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
THE GEOMAGNETIC FIELD WAS QUIET. ENERGETIC ELECTRON FLUXES AT
GEOSYNCHRONOUS ORBIT HOVERED CLOSE TO HIGH LEVELS FOR MOST OF THE
PERIOD.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT QUIET TO UNSETTLED LEVELS.
III. Event Probabilities 09 AUG to 11 AUG
| Class M | 25% | 20% | 15% |
| Class X | 05% | 05% | 01% |
| Proton | 05% | 05% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 08 AUG 138 Predicted 09 AUG-11 AUG 135/130/130 90 Day Mean 08 AUG 165
V. Geomagnetic A Indices
OBSERVED AFR/AP 07 AUG 011/011 ESTIMATED AFR/AP 08 AUG 005/008 PREDICTED AFR/AP 09 AUG-11 AUG 008/008-008/008-005/007
VI. Geomagnetic Activity Probabilities 09 AUG to 11 AUG
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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