Viewing archive of Sunday, 20 February 2011
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 2011 Feb 20 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 051 Issued at 2200Z on 20 Feb 2011IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity was low during the past 24 hours.
Region 1161 (N11W28) grew slightly in areal coverage and maintained
a beta-gamma magnetic classification. Region 1162 (N18W32) remained
stable throughout the period. Both regions produced C-class
activity and Region 1161 produced a long duration B6 event at
20/1837Z.
IB. Solar Activity Forecast
Solar activity is expected to be low
to moderate for the next three days (21-23 February). Regions 1161
and 1162 are both capable of producing M-class activity.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field was mostly quiet during the past 24 hours. The
greater than 2 MeV electron flux at geosynchronous orbit reached
high levels during the period.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly quiet for the next three days (21-23
February).
III. Event Probabilities 21 Feb to 23 Feb
| Class M | 60% | 60% | 50% |
| Class X | 05% | 05% | 05% |
| Proton | 05% | 05% | 05% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Feb 105 Predicted 21 Feb-23 Feb 100/100/095 90 Day Mean 20 Feb 086
V. Geomagnetic A Indices
Observed Afr/Ap 19 Feb 003/005 Estimated Afr/Ap 20 Feb 004/005 Predicted Afr/Ap 21 Feb-23 Feb 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 21 Feb to 23 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 05% | 05% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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