:Product: 1225RSGA.txt
:Issued: 2010 Dec 25 2200 UTC
# Prepared jointly by the U.S. Dept. of Commerce, NOAA,
# Space Weather Prediction Center and the U.S. Air Force.
#
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 359 Issued at 2200Z on 25 Dec 2010
IA.  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-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-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