Viewing archive of Friday, 20 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 20 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 110 Issued at 2200Z on 20 Apr 2007IA. Analysis of Solar Active Regions and Activity from 19-2100Z to 20-2100Z Solar activity was very low. The visible disk remains
spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 19-2100Z to 20-2100Z
The geomagnetic field was quiet.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to range from quiet to active for the next three days due
to a recurrent coronal hole high speed stream. Isolated active
periods are possible at high latitudes on 21 April.
III. Event Probabilities 21 Apr to 23 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 20 Apr 069 Predicted 21 Apr-23 Apr 070/070/070 90 Day Mean 20 Apr 075
V. Geomagnetic A Indices
Observed Afr/Ap 19 Apr 004/006 Estimated Afr/Ap 20 Apr 005/008 Predicted Afr/Ap 21 Apr-23 Apr 012/015-008/008-008/008
VI. Geomagnetic Activity Probabilities 21 Apr to 23 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 35% | 25% | 25% |
| Minor storm | 15% | 10% | 10% |
| Major-severe storm | 05% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 40% | 30% | 30% |
| Minor storm | 25% | 15% | 15% |
| Major-severe storm | 10% | 05% | 05% |
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