:Product: 1227RSGA.txt :Issued: 2009 Dec 27 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 361 Issued at 2200Z on 27 Dec 2009 IA. Analysis of Solar Active Regions and Activity from 26/2100Z to 27/2100Z: Solar activity was very low. Two B-class flares occurred during the period from Region 1039 (S27E31); the largest was a B7.6 at 1139Z. Region 1039 has grown during the past 24 hours and is currently a 7-spot Dso-beta group, with an area of approximately 100 millionths. IB. Solar Activity Forecast: Solar activity is expected to be very low to low. There is a chance for an isolated C-class event from Region 1039. IIA. Geophysical Activity Summary 26/2100Z to 27/2100Z: The geomagnetic field was quiet. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet for the next three days, with a slight chance for an isolated unsettled period on day three (28-30 December). III. Event Probabilities 28 Dec-30 Dec Class M 05/05/05 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 27 Dec 077 Predicted 28 Dec-30 Dec 078/079/080 90 Day Mean 27 Dec 074 V. Geomagnetic A Indices Observed Afr/Ap 26 Dec 002/003 Estimated Afr/Ap 27 Dec 002/005 Predicted Afr/Ap 28 Dec-30 Dec 005/005-005/005-005/005 VI. Geomagnetic Activity Probabilities 28 Dec-30 Dec A. Middle Latitudes Active 05/05/10 Minor storm 01/01/01 Major-severe storm 01/01/01 B. High Latitudes Active 05/05/15 Minor storm 01/01/01 Major-severe storm 01/01/01