Viewing archive of Sunday, 25 April 2010
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 2010 Apr 25 2201 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 25 Apr 2010IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity was very low. No flares were observed
during the last 24 hours and the disk remained spotless.
IB. Solar Activity Forecast
Solar activity is expected to remain
very low for the next three days (26-28 April).
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field was quiet during the last 24 hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be mostly quiet for day 1 (26 April) and quiet to
unsettled with isolated active periods for day 2 (27 April) due to
the arrival of a weak CME observed on 22 April and a recurrent
coronal hole high speed stream expected to rotate into a
geoeffective position. Quiet to unsettled conditions are expected
for day three (28 April) as the coronal hole high speed stream is
expected to persist.
III. Event Probabilities 26 Apr to 28 Apr
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Apr 075 Predicted 26 Apr-28 Apr 076/076/076 90 Day Mean 25 Apr 081
V. Geomagnetic A Indices
Observed Afr/Ap 24 Apr 008/008 Estimated Afr/Ap 25 Apr 003/005 Predicted Afr/Ap 26 Apr-28 Apr 007/008-010/012-007/005
VI. Geomagnetic Activity Probabilities 26 Apr to 28 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 35% | 15% |
| Minor storm | 05% | 15% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 40% | 20% |
| Minor storm | 10% | 15% | 10% |
| Major-severe storm | 01% | 01% | 01% |
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