Viewing archive of Thursday, 25 December 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 Dec 25 2201 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 360 Issued at 2200Z on 25 Dec 2008IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity was very low. No flares were observed.
The visible disk was spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
Geomagnetic field activity was at quiet levels. ACE solar wind data
indicated Earth remained within a gradually subsiding coronal hole
high-speed stream. Solar wind velocities gradually decreased from
519 to 430 km/sec during the period. IMF Bz was variable in the +03
to -04 nT range.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is
expected to be at quiet levels during the forecast period (26 - 28
December).
III. Event Probabilities 26 Dec to 28 Dec
| Class M | 01% | 01% | 01% |
| Class X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 25 Dec 069 Predicted 26 Dec-28 Dec 070/071/071 90 Day Mean 25 Dec 069
V. Geomagnetic A Indices
Observed Afr/Ap 24 Dec 005/005 Estimated Afr/Ap 25 Dec 003/005 Predicted Afr/Ap 26 Dec-28 Dec 005/005-005/005-005/005
VI. Geomagnetic Activity Probabilities 26 Dec to 28 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 05% | 01% | 01% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 10% | 05% | 01% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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