:Product: 0422RSGA.txt :Issued: 2007 Apr 22 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 112 Issued at 2200Z on 22 Apr 2007 IA. Analysis of Solar Active Regions and Activity from 21/2100Z to 22/2100Z: Solar activity was very low. The visible solar disk remains spotless. IB. Solar Activity Forecast: Solar activity is expected to be very low. IIA. Geophysical Activity Summary 21/2100Z to 22/2100Z: The geomagnetic field was quiet to unsettled. The solar wind speed increased to about 450 km/s due to a recurrent coronal hole high speed stream. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled for the next three days (23 - 25 April). Isolated active periods are possible at high latitudes on 23 April due to the coronal hole high speed stream. III. Event Probabilities 23 Apr-25 Apr Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 22 Apr 069 Predicted 23 Apr-25 Apr 070/070/070 90 Day Mean 22 Apr 074 V. Geomagnetic A Indices Observed Afr/Ap 21 Apr 002/002 Estimated Afr/Ap 22 Apr 008/012 Predicted Afr/Ap 23 Apr-25 Apr 010/010-005/005-005/005 VI. Geomagnetic Activity Probabilities 23 Apr-25 Apr A. Middle Latitudes Active 25/20/20 Minor storm 10/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 30/20/20 Minor storm 15/05/05 Major-severe storm 05/01/01