Viewing archive of Friday, 11 February 2000
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 2000 Feb 11 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 042 Issued at 2200Z on 11 FEB 2000IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z SOLAR ACTIVITY WAS LOW. REGION 8858 (N24W25) CONTINUED
TO PRODUCE SMALL C-CLASS SUBFLARES. THIS REGION HAS SHOWN FURTHER
DECAY IN SUNSPOT AREA AND COMPLEXITY. OTHER REGIONS WERE RELATIVELY
INACTIVE. NEW REGIONS 8871 (S14W09) AND 8872 (S28E79) WERE NUMBERED.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW
TO MODERATE. REGION 8858 REMAINS CAPABLE OF ISOLATED M-CLASS
ACTIVITY.
IIA. Geophysical Activity Summary 10-2100Z to 11-2100Z
THE GEOMAGNETIC FIELD WAS QUIET TO UNSETTLED UNTIL ABOUT 11/0300UT
WHEN A SUDDEN IMPULSE WAS OBSERVED ON THE BOULDER MAGNETOMETER.
ACTIVE CONDITIONS FOLLOWED DURING THE 11/0300-0600UT PERIOD. THE SI
IS BELIEVED TO BE ASSOCIATED WITH THE CME THAT OCCURRED ON 08
FEBRUARY. THE GREATER THAN 2 MEV ELECTRON FLUX AT GEOSYNCHRONOUS
ORBIT WAS MODERATE TO HIGH.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS
EXPECTED TO BE MOSTLY UNSETTLED TO ACTIVE. ELEVATED ACTIVITY LEVELS
ARE POSSIBLE ON 12-13 FEBRUARY DUE TO CMES THAT OCCURRED ON 09 AND
10 FEBRUARY.
III. Event Probabilities 12 FEB to 14 FEB
| Class M | 30% | 30% | 30% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 11 FEB 170 Predicted 12 FEB-14 FEB 170/170/168 90 Day Mean 11 FEB 170
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 FEB 010/007 ESTIMATED AFR/AP 11 FEB 012/013 PREDICTED AFR/AP 12 FEB-14 FEB 015/020-015/030-010/015
VI. Geomagnetic Activity Probabilities 12 FEB to 14 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 15% |
| Minor storm | 15% | 15% | 10% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 30% | 25% |
| Minor storm | 20% | 20% | 15% |
| Major-severe storm | 05% | 05% | 05% |
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