Viewing archive of Saturday, 25 December 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 Dec 25 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 359 Issued at 2200Z on 25 Dec 2010IA. Analysis of Solar Active Regions and Activity from 24-2100Z to 25-2100Z Solar activity was very low. Two new regions were
numbered today as Region 1136 (S22W57) and Region 1137 (N18E23).
Both regions are beta magnetic classifications.
IB. Solar Activity Forecast
Solar activity is expected to be very
low.
IIA. Geophysical Activity Summary 24-2100Z to 25-2100Z
The geomagnetic field was quiet. Observations from the ACE
spacecraft indicate a co-rotating interaction region signature, in
advance of a coronal hole high speed stream, around 25/1430Z. The
IMF Bt reached +10 nT while the IMF Bz was at -7 nT. Solar wind
speeds have continued to increase through the period from 340 km/s
to 400 km/s.
IIB. Geophysical Activity Forecast
The geomagnetic field is
expected to be at quiet to unsettled levels for days one and two
(26-27 December) due to a coronal hole high speed stream and
possible effects from the CME on 23 December. Quiet conditions are
expected for day three (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 079 Predicted 26 Dec-28 Dec 080/080/082 90 Day Mean 25 Dec 083
V. Geomagnetic A Indices
Observed Afr/Ap 24 Dec 003/003 Estimated Afr/Ap 25 Dec 005/005 Predicted Afr/Ap 26 Dec-28 Dec 008/008-007/008-005/005
VI. Geomagnetic Activity Probabilities 26 Dec to 28 Dec
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 10% | 10% | 05% |
| Minor storm | 01% | 01% | 01% |
| Major-severe storm | 01% | 01% | 00% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 20% | 20% | 05% |
| Minor storm | 05% | 05% | 01% |
| Major-severe storm | 01% | 01% | 01% |
All times in UTC
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