:Product: 0421RSGA.txt :Issued: 2007 Apr 21 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 111 Issued at 2200Z on 21 Apr 2007 IA. Analysis of Solar Active Regions and Activity from 20/2100Z to 21/2100Z: 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 20/2100Z to 21/2100Z: The geomagnetic field was quiet. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled with possible active periods at high latitudes on 22 April due to a recurrent coronal hole high speed stream. Expect quiet to unsettled conditions on 23 - 24 April. III. Event Probabilities 22 Apr-24 Apr Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 21 Apr 069 Predicted 22 Apr-24 Apr 070/070/070 90 Day Mean 21 Apr 075 V. Geomagnetic A Indices Observed Afr/Ap 20 Apr 002/003 Estimated Afr/Ap 21 Apr 005/010 Predicted Afr/Ap 22 Apr-24 Apr 010/015-008/008-005/005 VI. Geomagnetic Activity Probabilities 22 Apr-24 Apr A. Middle Latitudes Active 25/20/15 Minor storm 10/10/05 Major-severe storm 01/01/01 B. High Latitudes Active 35/25/25 Minor storm 20/15/15 Major-severe storm 05/01/01