Viewing archive of Saturday, 26 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 26 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 057 Issued at 2200Z on 26 FEB 2000IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z SOLAR ACTIVITY REMAINED AT A LOW LEVEL. SEVERAL LOW
LEVEL C-CLASS EVENTS OCCURRED. REGION 8891 (S15E60) IS A LARGE
REGION OF OVER 700 MILLIONTHS AREA BUT EXHIBITS A BIPOLAR MAGNETIC
STRUCTURE. REGION 8882 (S16E08) SHOWED SOME MINOR MIXING OF
POLARITIES AND A WEAK DELTA CONFIGURATION MAY EXIST HERE. REGION
8889 (N20E46) IS A MODERATE SIZE E CLASS GROUP WITH A LARGE TRAILING
FILAMENT THAT WAS QUITE ACTIVE AT TIMES DURING THE PERIOD. A LONG
DURATION C2 X-RAY FLARE OCCURRED BETWEEN 26/1036-1222Z. SOHO DATA
INDICATE THIS EVENT ORIGINATED FROM BEHIND THE SOUTHWEST LIMB.
IB. Solar Activity Forecast
SOLAR ACTIVITY SHOULD BE LOW TO
MODERATE. M-CLASS EVENTS ARE POSSIBLE FROM REGIONS 8882, 8889, AND
8891. THERE IS ALSO THE POSSIBILITY OF A LONG DURATION C OR M-CLASS
EVENT FROM REGION 8889 SHOULD THE NEARBY FILAMENT ERUPT. THERE IS A
SLIGHT CHANCE OF AN X-CLASS EVENT DURING THE PERIOD. THIS CHANCE
WOULD BECOME GREATER SHOULD REGIONS 8882 AND 8891 BEGIN TO EVOLVE
QUICKLY AND DEVELOP GREATER MAGNETIC COMPLEXITY.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO ACTIVE LEVELS. SOLAR WIND
VELOCITY CONTINUED TO SLOWLY DECLINE BUT ENDED THE PERIOD STILL
ELEVATED NEAR 600 KM/S. ENERGETIC ELECTRON FLUXES AT GEOSYNCHRONOUS
ORBIT REACHED HIGH LEVELS FOR THE SECOND CONSECUTIVE DAY.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD SHOULD BE
PREDOMINANTLY QUIET TO UNSETTLED FOR 27 FEB. ISOLATED ACTIVE PERIODS
ARE POSSIBLE AS THIS CORONAL HOLE RELATED DISTURBANCE SUBSIDES.
MOSTLY QUIET CONDITIONS ARE EXPECTED ON 28-29 FEB. ENERGETIC
ELECTRON FLUXES SHOULD REMAIN ELEVATED FOR THE NEXT FEW DAYS.
III. Event Probabilities 27 FEB to 29 FEB
| Class M | 60% | 60% | 60% |
| Class X | 15% | 15% | 15% |
| Proton | 05% | 05% | 05% |
| PCAF | GREEN | ||
IV. Penticton 10.7 cm Flux
Observed 26 FEB 215 Predicted 27 FEB-29 FEB 217/219/220 90 Day Mean 26 FEB 165
V. Geomagnetic A Indices
OBSERVED AFR/AP 25 FEB 014/018 ESTIMATED AFR/AP 26 FEB 012/011 PREDICTED AFR/AP 27 FEB-29 FEB 012/008-008/010-008/010
VI. Geomagnetic Activity Probabilities 27 FEB to 29 FEB
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 25% | 15% |
| Minor storm | 10% | 10% | 05% |
| Major-severe storm | 05% | 01% | 01% |
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