Viewing archive of Wednesday, 10 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 10 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 041 Issued at 2200Z on 10 FEB 1999IA. Analysis of Solar Active Regions and Activity from 09-2100Z to 10-2100Z SOLAR ACTIVITY WAS LOW. REGIONS 8457 (N17E48) AND 8458
(S18E55) PRODUCED SEVERAL MINOR C-CLASS SUBFLARES. REGION 8458
APPEARS NOW AS A MODERATELY LARGE D-TYPE SPOT GROUP COVERING AS MUCH
AS 600 MILLIONTHS OF WHITE LIGHT AREA. MAGNETIC ANALYSIS INDICATE
ONLY MINOR COMPLEXITY IN THIS REGION FOR NOW. NEW REGION 8460
(S17E70) WAS NUMBERED TODAY AS AN H-TYPE SPOT NE OF REGION 8458.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO REMAIN
LOW. REGIONS 8457 AND 8458 ARE THE LIKELY SOURCE REGIONS FOR
CONTINUED C-CLASS ACTIVITY. REGION 8458 HOLDS SLIGHT POTENTIAL FOR
AN ISOLATED M-CLASS FLARE.
IIA. Geophysical Activity Summary 09-2100Z to 10-2100Z
THE GEOMAGNETIC FIELD WAS QUIET WITH A SINGLE UNSETTLED PERIOD
OBSERVED BETWEEN 10/1500-1800Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO CONTINUE AT QUIET TO UNSETTLED LEVELS. THE GREATER THAN
2 MEV ELECTRON FLUX AT GEO-SYNCHRONOUS ALTITUDE IS EXPECTED TO BE AT
MODERATE TO HIGH LEVELS.
III. Event Probabilities 11 FEB to 13 FEB
| Class M | 25% | 25% | 25% |
| Class X | 05% | 05% | 05% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 10 FEB 152 Predicted 11 FEB-13 FEB 155/160/165 90 Day Mean 10 FEB 140
V. Geomagnetic A Indices
OBSERVED AFR/AP 09 FEB 002/005 ESTIMATED AFR/AP 10 FEB 008/008 PREDICTED AFR/AP 11 FEB-13 FEB 010/010-008/008-008/012
VI. Geomagnetic Activity Probabilities 11 FEB to 13 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 15% | 15% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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