Viewing archive of Saturday, 25 August 2012
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 2012 Aug 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 238 Issued at 2200Z on 25 Aug 2012IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity was low. Region 1554 (N15W00) produced
one C1/Sf flare at 0236Z. No CMEs observed in the past 24 hours are
expected to be geoeffective. New Region 1555 (N09E69) was numbered
overnight and has developed into a Dao type spot group with a beta
magnetic configuration.
IB. Solar Activity Forecast
Solar activity is expected to be very
low with a chance for C-class activity.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
Geomagnetic activity was at quiet to unsettled levels with two
periods of active to major storm levels at high latitudes. Solar
wind velocity increased to around 600 km/s with the arrival of a
coronal hole high speed stream.
IIB. Geophysical Activity Forecast
Geomagnetic activity is
expected to be at quiet to unsettled levels with a slight chance for
active to major storm levels at high latitudes on 26 August due to
residual coronal hole high speed stream effects. Activity is
expected to decline to mostly quiet levels with a slight chance for
active to minor storm levels at high latitudes on 27 August. On day
3 (28 August) conditions are expected to return to quiet to
unsettled levels with a chance for minor to major storm levels due
to the arrival of another negative polarity coronal hole.
III. Event Probabilities 26 Aug to 28 Aug
| Class M | 10% | 10% | 10% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | Green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Aug 106 Predicted 26 Aug-28 Aug 110/110/110 90 Day Mean 25 Aug 124
V. Geomagnetic A Indices
Observed Afr/Ap 24 Aug 009/010 Estimated Afr/Ap 25 Aug 008/009 Predicted Afr/Ap 26 Aug-28 Aug 007/008-005/005-007/008
VI. Geomagnetic Activity Probabilities 26 Aug to 28 Aug
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 15% | 05% | 15% |
| Minor storm | 05% | 01% | 05% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 15% |
| Minor storm | 20% | 15% | 25% |
| Major-severe storm | 20% | 05% | 25% |
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