Viewing archive of Friday, 5 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 05 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 036 Issued at 2200Z on 05 FEB 1999IA. Analysis of Solar Active Regions and Activity from 04-2100Z to 05-2100Z SOLAR ACTIVITY DECLINED TO VERY LOW LEVELS. NO FLARES
WERE DETECTED. REGION 8453 (S26E04) WAS THE ONLY SPOTTED REGION ON
THE DISK. A 16-DEGREE FILAMENT, LAST SEEN NEAR S23E82, DISAPPEARED
SOMETIME OVERNIGHT. A 38-DEGREE FILAMENT, LAST OBSERVED NEAR S62E09,
DISAPPEARED AROUND 05/1400Z. AN ERUPTIVE PROMINENCE REACHING 0.42
SOLAR RADII WAS OBSERVED ON THE SOUTHWEST LIMB BEGINNING AT
05/1936Z. TODAY'S 10.7 CM RADIO FLUX READING WAS THE LOWEST SINCE
LAST OCTOBER.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE VERY
LOW DURING THE FIRST TWO DAYS. AN INCREASE IN ACTIVITY LEVELS IS
POSSIBLE ON THE FINAL DAY WITH THE EXPECTED RETURN OF OLD REGIONS
8439 (S23, L = 272) AND 8440 (N19, L = 265).
IIA. Geophysical Activity Summary 04-2100Z to 05-2100Z
THE GEOMAGNETIC FIELD WAS AT QUIET TO UNSETTLED LEVELS WITH BRIEF,
LOCALIZED ACTIVE PERIODS OBSERVED AT SOME HIGH LATITUDE STATIONS.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO REMAIN AT QUIET TO UNSETTLED LEVELS.
III. Event Probabilities 06 FEB to 08 FEB
| Class M | 05% | 05% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 05 FEB 104 Predicted 06 FEB-08 FEB 105/105/115 90 Day Mean 05 FEB 142
V. Geomagnetic A Indices
OBSERVED AFR/AP 04 FEB 005/007 ESTIMATED AFR/AP 05 FEB 008/010 PREDICTED AFR/AP 06 FEB-08 FEB 008/011-008/011-008/011
VI. Geomagnetic Activity Probabilities 06 FEB to 08 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 25% | 25% | 25% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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