Viewing archive of Tuesday, 9 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 09 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 040 Issued at 2200Z on 09 FEB 1999IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z SOLAR ACTIVITY WAS LOW. THREE C-CLASS X-RAY BURSTS
OCCURRED, THE LARGEST, A C-2/SF AT 09/0508Z FROM REGION 8453
(S25W48). A TYPE II SWEEP ALSO OCCURRED WITH THIS FLARE. THE
REMAINING TWO C-1 X-RAY BURSTS WERE OPTICALLY UNCORRELATED. LIMB
PROXIMITY STILL PROHIBITS ACCURATE ANALYSIS OF REGION 8458 (S22E65),
A LARGE SPOT GROUP ROTATING AROUND THE SE LIMB; HOWEVER, NO
SIGNIFICANT ACTIVITY HAS BEEN OBSERVED YET DURING ITS LIMB CROSSING.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW.
ISOLATED C-CLASS FLARES ARE POSSIBLE FROM REGION 8456 AND 8458.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
THE GEOMAGNETIC FIELD HAS BEEN QUIET.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED WITH ISOLATED ACTIVE CONDITIONS
OVER THE NEXT TWO DAYS. ACTIVITY WILL DECLINE TO QUIET TO UNSETTLED
NEAR THE END OF THE PERIOD. THE GREATER THAN 2 MEV ELECTRON FLUX AT
GEO-SYNCHRONOUS ALTITUDE IS EXPECTED TO BE AT MODERATE TO HIGH
LEVELS.
III. Event Probabilities 10 FEB to 12 FEB
| Class M | 10% | 10% | 20% |
| Class X | 01% | 01% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 09 FEB 129 Predicted 10 FEB-12 FEB 135/140/150 90 Day Mean 09 FEB 140
V. Geomagnetic A Indices
OBSERVED AFR/AP 08 FEB 004/005 ESTIMATED AFR/AP 09 FEB 005/005 PREDICTED AFR/AP 10 FEB-12 FEB 012/008-010/008-010/010
VI. Geomagnetic Activity Probabilities 10 FEB to 12 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 15% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 25% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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