Viewing archive of Saturday, 26 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 26 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 117 Issued at 2200Z on 26 Apr 2008IA. Analysis of Solar Active Regions and Activity from 25-2100Z to 26-2100Z Solar activity was very low. The solar disk is void of
spots. Nonetheless there was a B3/Sf flare at 1408Z from an
unnumbered area of spotless plage near N08E09. The flare was
associated with a wave that was visible in EUV imagery on STEREO and
SOHO, type II and type IV radio sweeps, as well as a slow, faint,
full halo CME visible in coronagraph imagery. The estimated plane of
sky speed for the CME was around 430-480 km/s.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 25-2100Z to 26-2100Z
The geomagnetic field was quiet to unsettled during the past 24
hours. Solar wind speed remains somewhat elevated (around 460-500
km/s) and density very low (around 1 p/cc), consistent with the
decaying phase of a high speed stream. The greater than 2 MeV
electron flux at geosynchronous orbit was high during the past 24
hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be predominantly quiet for the next two days (27-28
April). A small increase is expected late on the third day (29
April) in response to today's CME event: activity is expected to be
unsettled with a chance for isolated active periods after the
disturbance arrives.
III. Event Probabilities 27 Apr to 29 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 26 Apr 069 Predicted 27 Apr-29 Apr 070/070/070 90 Day Mean 26 Apr 071
V. Geomagnetic A Indices
Observed Afr/Ap 25 Apr 007/008 Estimated Afr/Ap 26 Apr 007/008 Predicted Afr/Ap 27 Apr-29 Apr 005/005-005/005-007/008
VI. Geomagnetic Activity Probabilities 27 Apr to 29 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 20% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 25% |
| Minor storm | 05% | 05% | 10% |
| Major-severe storm | 01% | 01% | 05% |
All times in UTC
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