Viewing archive of Friday, 17 August 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 Aug 17 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 229 Issued at 2200Z on 17 Aug 2007IA. Analysis of Solar Active Regions and Activity from 16-2100Z to 17-2100Z Solar activity continues at very low levels. There was
no significant activity observed this period.
IB. Solar Activity Forecast
Solar activity is expected to continue
at very low levels.
IIA. Geophysical Activity Summary 16-2100Z to 17-2100Z
The geomagnetic field was quiet. Solar wind speed decreased to less
than 400 km/s.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled. A coronal hole is expected to
result in occasional unsettled periods on 19 Aug.
III. Event Probabilities 18 Aug to 20 Aug
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 17 Aug 068 Predicted 18 Aug-20 Aug 065/065/070 90 Day Mean 17 Aug 072
V. Geomagnetic A Indices
Observed Afr/Ap 16 Aug 006/007 Estimated Afr/Ap 17 Aug 005/005 Predicted Afr/Ap 18 Aug-20 Aug 005/005-008/012-005/005
VI. Geomagnetic Activity Probabilities 18 Aug to 20 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 20% | 15% |
| Minor storm | 01% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 25% | 20% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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