Viewing archive of Friday, 25 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 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 056 Issued at 2200Z on 25 FEB 2000IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z
SOLAR ACTIVITY BECAME LOW. THE LARGEST EVENT OF THE
PERIOD WAS A MODERATE DURATION C8/SF AT 25/0919Z FROM REGION 8888
(N36E43). A CORONAL MASS EJECTION ACCOMPANIED THIS EVENT BUT WAS
DIRECTED OUT OF THE ECLIPTIC. OTHER THAN THIS EVENT, THE REGION WAS
MOSTLY STABLE DURING THE PERIOD. REGION 8889 (N21E59) SHOWED ITSELF
AS A MODERATE SIZE E CLASS GROUP AND PRODUCED SMALL C-CLASS
SUBFLARES. A LARGE NEW REGION ROTATED OVER THE EAST LIMB AT S13E72
AND WAS NUMBERED AS REGION 8891. THIS AREA WAS PREDOMINANTLY STABLE
DURING THE PERIOD. THERE WERE ALSO HIGH LATITUDE MASS EJECTIONS FROM
THE NORTHWEST AND SOUTHEAST LIMBS DURING THE PERIOD.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD RETURN TO
MODERATE LEVELS. M-CLASS EVENTS ARE POSSIBLE FROM REGIONS 8891,
8889, AND TO A LESSER DEGREE, REGION 8888. THERE IS A SLIGHT BUT
GROWING POSSIBILITY OF A MAJOR FLARE FROM REGIONS 8891 AND 8889.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
THE GEOMAGNETIC FIELD WAS PREDOMINANTLY UNSETTLED TO ACTIVE. ISOLATED
PERIODS OF MINOR STORMING WERE OBSERVED. SOLAR WIND VELOCITY
DECREASED DURING THE PERIOD BUT REMAINED ELEVATED ABOVE 650 KM/S.
ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS ORBIT BECAME HIGH AROUND
25/1710Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD
REMAIN PREDOMINANTLY UNSETTLED TO ACTIVE WITH BRIEF PERIODS OF MINOR
STORMING FOR 26 FEB. THE CURRENT DISTURBANCE SHOULD SLOWLY DECLINE
ON 27-28 FEB. QUIET TO OCCASIONALLY ACTIVE CONDITIONS ARE EXPECTED
DURING THAT PERIOD. ENERGETIC ELECTRON FLUXES SHOULD REMAIN ELEVATED
FOR A MINIMUM OF THE NEXT THREE DAYS.
III. Event Probabilities 26 FEB to 28 FEB
| Class M | 75% | 75% | 75% |
| Class X | 15% | 15% | 15% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 25 FEB 210 Predicted 26 FEB-28 FEB 213/215/218 90 Day Mean 25 FEB 165
V. Geomagnetic A Indices
OBSERVED AFR/AP 24 FEB 020/026 ESTIMATED AFR/AP 25 FEB 020/020 PREDICTED AFR/AP 26 FEB-28 FEB 018/018-012/015-008/013
VI. Geomagnetic Activity Probabilities 26 FEB to 28 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 50% | 40% | 30% |
| Minor storm | 25% | 15% | 10% |
| Major-severe storm | 05% | 05% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 50% | 40% | 30% |
| Minor storm | 25% | 15% | 10% |
| Major-severe storm | 05% | 05% | 01% |
All times in UTC
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