Viewing archive of Thursday, 26 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 26 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 116 Issued at 2200Z on 26 Apr 2007IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity was very low. Region 953 (S10E61)
produced only B-class activity during the past 24 hours.
IB. Solar Activity Forecast
Solar activity is expected to be very
low to low.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field has been quiet to unsettled.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be quiet to unsettled on 27 April. A recurrent coronal
hole high speed stream is expected to become geoeffective on 28
April. Expect unsettled to minor storm conditions on 28 - 29 April.
III. Event Probabilities 27 Apr to 29 Apr
| Class M | 05% | 05% | 05% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Apr 081 Predicted 27 Apr-29 Apr 080/080/080 90 Day Mean 26 Apr 074
V. Geomagnetic A Indices
Observed Afr/Ap 25 Apr 004/005 Estimated Afr/Ap 26 Apr 005/005 Predicted Afr/Ap 27 Apr-29 Apr 005/005-015/025-015/015
VI. Geomagnetic Activity Probabilities 27 Apr to 29 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 30% | 30% |
| Minor storm | 01% | 20% | 20% |
| Major-severe storm | 01% | 05% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 40% | 35% |
| Minor storm | 05% | 25% | 20% |
| Major-severe storm | 01% | 10% | 05% |
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