:Product: 0417RSGA.txt :Issued: 2007 Apr 17 2203 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Environment Center and the U.S. Air Force. # Joint USAF/NOAA Report of Solar and Geophysical Activity SDF Number 107 Issued at 2200Z on 17 Apr 2007 IA. Analysis of Solar Active Regions and Activity from 16/2100Z to 17/2100Z: Solar activity was very low. Region 952 (S08W73) was numbered today. IB. Solar Activity Forecast: Solar activity is expected to be very low. IIA. Geophysical Activity Summary 16/2100Z to 17/2100Z: The geomagnetic field was quiet to unsettled. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be predominantly quiet to unsettled for the next three days (18-20 April). Isolated active periods are expected on 19-20 April, with a chance for isolated minor storm conditions at high latitudes on 20 April, due to a favorably positioned coronal hole. III. Event Probabilities 18 Apr-20 Apr Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 17 Apr 069 Predicted 18 Apr-20 Apr 070/070/070 90 Day Mean 17 Apr 075 V. Geomagnetic A Indices Observed Afr/Ap 16 Apr 000/001 Estimated Afr/Ap 17 Apr 005/007 Predicted Afr/Ap 18 Apr-20 Apr 005/005-008/010-015/015 VI. Geomagnetic Activity Probabilities 18 Apr-20 Apr A. Middle Latitudes Active 10/15/25 Minor storm 05/10/15 Major-severe storm 01/01/05 B. High Latitudes Active 15/20/30 Minor storm 05/15/20 Major-severe storm 01/05/10