:Product: 1231RSGA.txt :Issued: 2007 Dec 31 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 365 Issued at 2200Z on 31 Dec 2007 IA. Analysis of Solar Active Regions and Activity from 30/2100Z to 31/2100Z: Solar activity was low. A C8.3 flare occurred at 31/0111Z accompanied by Type II and Type IV radio sweeps (estimated shock speed 682 km/s). An associated CME was observed on the east limb near S09. The bright region from which the event originated has been assigned Region 980 (S09E90). IB. Solar Activity Forecast: Solar activity is expected to continue at low levels with a slight chance of an M-Class flare from Region 980. IIA. Geophysical Activity Summary 30/2100Z to 31/2100Z: The geomagnetic field was quiet. The greater than 2 MeV electrons at geosynchronous orbit remained at high levels today. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to remain quiet. III. Event Probabilities 01 Jan-03 Jan Class M 15/15/15 Class X 05/05/05 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 31 Dec 077 Predicted 01 Jan-03 Jan 078/080/085 90 Day Mean 31 Dec 072 V. Geomagnetic A Indices Observed Afr/Ap 30 Dec 003/002 Estimated Afr/Ap 31 Dec 005/005 Predicted Afr/Ap 01 Jan-03 Jan 005/005-005/005-005/005 VI. Geomagnetic Activity Probabilities 01 Jan-03 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 01/01/01