Viewing archive of Saturday, 13 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 13 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 044 Issued at 2200Z on 13 FEB 1999IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z SOLAR ACTIVITY WAS LOW. SEVERAL C-CLASS FLARES OCCURRED
IN REGION 8462 (N21E21), THE LARGEST BEING A C9/SN AT 13/1611UT.
THIS REGION IS A FAIRLY SMALL SUNSPOT GROUP TO THE NORTHEAST OF
LARGE GROUP 8457 (N15E10). REGION 8457 CONTINUED TO GROW IN WHITE
LIGHT AREA BUT DID NOT PRODUCE ANY SIGNIFICANT FLARES. REGION 8458
(S22E16), THE OTHER LARGE SUNSPOT GROUP ON THE DISK, HAS CHANGED
LITTLE SINCE YESTERDAY. SUBFLARES ALSO OCCURRED IN REGION 8456
(N23W09). NEW REGION 8465 (S33W60) EMERGED ON THE DISK.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. C-CLASS ACTIVITY IS EXPECTED TO CONTINUE. FLARES ARE
POSSIBLE IN REGIONS 8456, 8457, 8458, AND 8462. REGIONS 8457 AND
8462 HAVE THE BEST CHANCE OF PRODUCING AN M-CLASS FLARE.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED. THE GREATER THAN 2 MEV
ELECTRON FLUX WAS MODERATE SINCE 13/1200UT.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE QUIET TO UNSETTLED.
III. Event Probabilities 14 FEB to 16 FEB
| Class M | 50% | 50% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 13 FEB 198 Predicted 14 FEB-16 FEB 200/205/210 90 Day Mean 13 FEB 142
V. Geomagnetic A Indices
OBSERVED AFR/AP 12 FEB 015/021 ESTIMATED AFR/AP 13 FEB 007/008 PREDICTED AFR/AP 14 FEB-16 FEB 005/008-005/008-005/008
VI. Geomagnetic Activity Probabilities 14 FEB to 16 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 10% | 10% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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