Viewing archive of Monday, 8 February 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 Feb 08 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 039 Issued at 2200Z on 08 FEB 1999IA. Analysis of Solar Active Regions and Activity from 07-2100Z to 08-2100Z SOLAR ACTIVITY INCREASED TO LOW LEVELS. ISOLATED
C-CLASS SUBFLARES OCCURRED. NEWLY NUMBERED REGIONS 8457 (N18E73) AND
8458 (S23E76) MARKED THE RESPECTIVE RETURNS OF OLD 8440 AND 8439.
NEW REGION 8459 (S28E48) WAS ALSO ASSIGNED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW THROUGHOUT THE PERIOD. THERE IS ALSO A SLIGHT CHANCE FOR AN
ISOLATED M-CLASS FLARE.
IIA. Geophysical Activity Summary 07-2100Z to 08-2100Z
THE GEOMAGNETIC FIELD DECLINED TO MOSTLY QUIET LEVELS AT ALL
LATITUDES. THE GREATER THAN 2 MEV ELECTRON FLUX AT GEO-SYNCHRONOUS
ALTITUDE CONTINUED AN INCREASING TREND, BUT REMAINED AT MODERATE
LEVELS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE AT UNSETTLED TO ACTIVE LEVELS DURING 09 - 10
FEBRUARY, THEN DECLINE TO QUIET TO UNSETTLED LEVELS ON 11 FEBRUARY.
THE GREATER THAN 2 MEV ELECTRON FLUX AT GEO-SYNCHRONOUS ALTITUDE IS
EXPECTED TO BE AT MODERATE TO HIGH LEVELS.
III. Event Probabilities 09 FEB to 11 FEB
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 08 FEB 125 Predicted 09 FEB-11 FEB 135/145/150 90 Day Mean 08 FEB 140
V. Geomagnetic A Indices
OBSERVED AFR/AP 07 FEB 009/012 ESTIMATED AFR/AP 08 FEB 005/006 PREDICTED AFR/AP 09 FEB-11 FEB 015/011-015/011-012/011
VI. Geomagnetic Activity Probabilities 09 FEB to 11 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 35% | 35% | 30% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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