:Product: 1212RSGA.txt :Issued: 2007 Dec 12 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 346 Issued at 2200Z on 12 Dec 2007 IA. Analysis of Solar Active Regions and Activity from 11/2100Z to 12/2100Z: Solar activity has been very low. Region 978 (S06W12) has produced several low level B-class flares. The region is mostly unchanged and remains a magnetic beta-gamma configuration. A northern plage region with reverse polarity characteristics, according to GONG magnetograms, is the only other solar feature of note. IB. Solar Activity Forecast: Solar activity is expected to be very low to low. Region 978 remains capable of producing an isolated C-class event. IIA. Geophysical Activity Summary 11/2100Z to 12/2100Z: The geomagnetic field was quiet to unsettled with an isolated active period from 12/0900-1200Z at mid-latitudes. ACE solar wind measurements indicate the continued influence of the recurrent coronal hole high-speed stream. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be predominately quiet for 13-15 December. III. Event Probabilities 13 Dec-15 Dec Class M 10/10/10 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 12 Dec 094 Predicted 13 Dec-15 Dec 095/095/095 90 Day Mean 12 Dec 070 V. Geomagnetic A Indices Observed Afr/Ap 11 Dec 009/012 Estimated Afr/Ap 12 Dec 010/010 Predicted Afr/Ap 13 Dec-15 Dec 005/005-005/005-005/005 VI. Geomagnetic Activity Probabilities 13 Dec-15 Dec A. Middle Latitudes Active 10/10/10 Minor storm 05/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor storm 10/10/10 Major-severe storm 01/01/01