:Product: 1230RSGA.txt :Issued: 2007 Dec 30 2203 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 364 Issued at 2200Z on 30 Dec 2007 IA. Analysis of Solar Active Regions and Activity from 29/2100Z to 30/2100Z: Solar activity was low due to a C1.7 flare observed at 30/2005Z. The most likely origin of the flare was a brightening on the east limb near where old Region 978 (S08, L=223) is expected to return. IB. Solar Activity Forecast: Solar activity is expected to remain very low to low. An increasing chance of C-class activity is expected through the forecast period (31 Dec 07 - 2 Jan 08). IIA. Geophysical Activity Summary 29/2100Z to 30/2100Z: The geomagnetic field was quiet. The greater than 2 MeV electrons at geosynchronous orbit reached high levels again today. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to remain quiet. III. Event Probabilities 31 Dec-02 Jan Class M 01/05/05 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 30 Dec 075 Predicted 31 Dec-02 Jan 075/075/080 90 Day Mean 30 Dec 071 V. Geomagnetic A Indices Observed Afr/Ap 29 Dec 002/002 Estimated Afr/Ap 30 Dec 005/005 Predicted Afr/Ap 31 Dec-02 Jan 005/005-005/005-005/005 VI. Geomagnetic Activity Probabilities 31 Dec-02 Jan A. Middle Latitudes Active 10/10/10 Minor storm 05/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 10/10/10 Minor storm 05/05/05 Major-severe storm 01/01/00