Viewing archive of Tuesday, 17 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 17 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 107 Issued at 2200Z on 17 Apr 2007IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity was very low. Region 952 (S08W73) was
numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic field was quiet to unsettled.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be predominantly quiet to unsettled for the next three
days (18-20 April). Isolated active periods are expected on 19-20
April, with a chance for isolated minor storm conditions at high
latitudes on 20 April, due to a favorably positioned coronal hole.
III. Event Probabilities 18 Apr to 20 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Apr 069 Predicted 18 Apr-20 Apr 070/070/070 90 Day Mean 17 Apr 075
V. Geomagnetic A Indices
Observed Afr/Ap 16 Apr 000/001 Estimated Afr/Ap 17 Apr 005/007 Predicted Afr/Ap 18 Apr-20 Apr 005/005-008/010-015/015
VI. Geomagnetic Activity Probabilities 18 Apr to 20 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 15% | 25% |
| Minor storm | 05% | 10% | 15% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 30% |
| Minor storm | 05% | 15% | 20% |
| Major-severe storm | 01% | 05% | 10% |
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