Viewing archive of Sunday, 20 February 2005
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 2005 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 2005IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity decreased to very low levels. A long
duration B-class flare was observed at 20/1628Z from just beyond the
solar west limb. This event is believed to be from Region 732 (N08
L=188) which rotated out of view on 18 February. Region 735
(S09W58) has changed little since yesterday and remains a magnetic
beta-gamma group. Region 736 (N13W50) is a weak beta magnetic
region that was numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be at
very low to low levels. Region 735 continues to show enough
complexity to possibly produce isolated C-class flare activity.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field was at predominantly quiet to unsettled levels.
An isolated active period did occur between 20/2400 and 0300Z that
appears to be due to a recurrent high speed coronal hole stream.
The coronal hole has been waning throughout the period and current
solar wind speeds have dropped to near 400 km/s. The greater than 2
MeV electron flux at geosynchronous orbit reached high levels again
today.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at predominantly quiet to unsettled levels throughout
the period.
III. Event Probabilities 21 Feb to 23 Feb
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Feb 096 Predicted 21 Feb-23 Feb 095/095/090 90 Day Mean 20 Feb 101
V. Geomagnetic A Indices
Observed Afr/Ap 19 Feb 008/014 Estimated Afr/Ap 20 Feb 006/010 Predicted Afr/Ap 21 Feb-23 Feb 005/005-007/010-007/012
VI. Geomagnetic Activity Probabilities 21 Feb to 23 Feb
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 25% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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