:Product: 0420RSGA.txt :Issued: 2007 Apr 20 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 110 Issued at 2200Z on 20 Apr 2007 IA. Analysis of Solar Active Regions and Activity from 19/2100Z to 20/2100Z: Solar activity was very low. The visible disk remains spotless. IB. Solar Activity Forecast: Solar activity is expected to be very low. IIA. Geophysical Activity Summary 19/2100Z to 20/2100Z: The geomagnetic field was quiet. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to range from quiet to active for the next three days due to a recurrent coronal hole high speed stream. Isolated active periods are possible at high latitudes on 21 April. III. Event Probabilities 21 Apr-23 Apr Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 20 Apr 069 Predicted 21 Apr-23 Apr 070/070/070 90 Day Mean 20 Apr 075 V. Geomagnetic A Indices Observed Afr/Ap 19 Apr 004/006 Estimated Afr/Ap 20 Apr 005/008 Predicted Afr/Ap 21 Apr-23 Apr 012/015-008/008-008/008 VI. Geomagnetic Activity Probabilities 21 Apr-23 Apr A. Middle Latitudes Active 35/25/25 Minor storm 15/10/10 Major-severe storm 05/01/01 B. High Latitudes Active 40/30/30 Minor storm 25/15/15 Major-severe storm 10/05/05