:Product: 1218RSGA.txt :Issued: 2008 Dec 18 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 353 Issued at 2200Z on 18 Dec 2008 IA. Analysis of Solar Active Regions and Activity from 17/2100Z to 18/2100Z: Solar activity was very low. IB. Solar Activity Forecast: Solar activity is expected to be very low. IIA. Geophysical Activity Summary 17/2100Z to 18/2100Z: The geomagnetic field was at quiet levels. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet levels for the next three days (19-21 December). III. Event Probabilities 19 Dec-21 Dec Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 18 Dec 068 Predicted 19 Dec-21 Dec 068/068/068 90 Day Mean 18 Dec 069 V. Geomagnetic A Indices Observed Afr/Ap 17 Dec 003/005 Estimated Afr/Ap 18 Dec 001/005 Predicted Afr/Ap 19 Dec-21 Dec 005/005-005/005-005/005 VI. Geomagnetic Activity Probabilities 19 Dec-21 Dec A. Middle Latitudes Active 05/05/05 Minor storm 01/01/01 Major-severe storm 01/01/01 B. High Latitudes Active 05/05/05 Minor storm 01/01/01 Major-severe storm 01/01/01