:Product: 0418RSGA.txt :Issued: 2007 Apr 18 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 108 Issued at 2200Z on 18 Apr 2007 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 predominantly quiet to unsettled with one active period from 18/0000Z-0300Z. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be predominantly quiet to unsettled with isolated active periods for the next three days. Isolated minor storm conditions are possible at high latitudes on 20 April in response to a favorably positioned coronal hole. III. Event Probabilities 19 Apr-21 Apr Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 18 Apr 069 Predicted 19 Apr-21 Apr 070/070/070 90 Day Mean 18 Apr 075 V. Geomagnetic A Indices Observed Afr/Ap 17 Apr 006/008 Estimated Afr/Ap 18 Apr 008/008 Predicted Afr/Ap 19 Apr-21 Apr 008/010-015/015-008/010 VI. Geomagnetic Activity Probabilities 19 Apr-21 Apr A. Middle Latitudes Active 20/30/25 Minor storm 10/20/10 Major-severe storm 01/05/01 B. High Latitudes Active 25/35/30 Minor storm 15/25/15 Major-severe storm 05/10/05