Viewing archive of Thursday, 24 April 2008
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 2008 Apr 24 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 115 Issued at 2200Z on 24 Apr 2008IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z Solar activity was very low.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
The geomagnetic field was at unsettled to active conditions due to
the continued influence of the recurrent coronal hole high speed
stream. Solar wind speeds, as measured from the ACE spacecraft,
remain around 600 km/s. The greater than 2 MeV electron flux at
geosynchronous orbit was at high levels.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be unsettled with isolated active periods for 25 April.
Predominantly quiet conditions are expected for 26-27 April.
III. Event Probabilities 25 Apr to 27 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 24 Apr 070 Predicted 25 Apr-27 Apr 070/070/070 90 Day Mean 24 Apr 072
V. Geomagnetic A Indices
Observed Afr/Ap 23 Apr 017/032 Estimated Afr/Ap 24 Apr 015/022 Predicted Afr/Ap 25 Apr-27 Apr 010/012-005/008-005/005
VI. Geomagnetic Activity Probabilities 25 Apr to 27 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 25% | 10% | 10% |
| Minor storm | 05% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 30% | 10% | 10% |
| Minor storm | 10% | 05% | 05% |
| Major-severe storm | 01% | 01% | 01% |
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