Viewing archive of Sunday, 27 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 27 2203 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 118 Issued at 2200Z on 27 Apr 2008IA. Analysis of Solar Active Regions and Activity from 26-2100Z to 27-2100Z Solar activity was very low. No flares were observed
during the past 24 hours and the solar disk is void of spots.
Yesterday's CME (associated with the B3 x-ray flare at 26/1408)
could be seen to be transiting the STEREO-A and B Heliospheric
Imager I (HI1) fields of view.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 26-2100Z to 27-2100Z
The geomagnetic field was predominantly quiet to unsettled. The
greater than 2 MeV electron flux at geosynchronous orbit reached
high levels during the past 24 hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly quiet for the first day (28 April) and most of
the second day (29 April). An increase is possible late on the
second day or early on the third day (30 April) due to an
anticipated glancing blow from the CME that was observed on 26
April. Activity is expected to increase to predominantly unsettled
levels at that time with a chance for isolated active periods.
III. Event Probabilities 28 Apr to 30 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 27 Apr 068 Predicted 28 Apr-30 Apr 068/068/068 90 Day Mean 27 Apr 072
V. Geomagnetic A Indices
Observed Afr/Ap 26 Apr 005/010 Estimated Afr/Ap 27 Apr 007/008 Predicted Afr/Ap 28 Apr-30 Apr 005/005-007/008-010/012
VI. Geomagnetic Activity Probabilities 28 Apr to 30 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 20% | 25% |
| Minor storm | 05% | 10% | 15% |
| Major-severe storm | 01% | 01% | 05% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 25% | 30% |
| Minor storm | 05% | 10% | 20% |
| Major-severe storm | 01% | 05% | 05% |
All times in UTC
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