Viewing archive of Sunday, 22 April 2007
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 2007 Apr 22 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 112 Issued at 2200Z on 22 Apr 2007IA. Analysis of Solar Active Regions and Activity from 21-2100Z to 22-2100Z Solar activity was very low. The visible solar disk
remains spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 21-2100Z to 22-2100Z
The geomagnetic field was quiet to unsettled. The solar wind speed
increased to about 450 km/s due to a recurrent coronal hole high
speed stream.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled for the next three days (23 - 25
April). Isolated active periods are possible at high latitudes on
23 April due to the coronal hole high speed stream.
III. Event Probabilities 23 Apr to 25 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 22 Apr 069 Predicted 23 Apr-25 Apr 070/070/070 90 Day Mean 22 Apr 074
V. Geomagnetic A Indices
Observed Afr/Ap 21 Apr 002/002 Estimated Afr/Ap 22 Apr 008/012 Predicted Afr/Ap 23 Apr-25 Apr 010/010-005/005-005/005
VI. Geomagnetic Activity Probabilities 23 Apr to 25 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 20% | 20% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 20% | 20% |
| Minor storm | 15% | 05% | 05% |
| Major-severe storm | 05% | 01% | 01% |
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