:Product: 0425RSGA.txt :Issued: 2007 Apr 26 0411 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 115 Issued at 2200Z on 25 Apr 2007 IA. Analysis of Solar Active Regions and Activity from 24/2100Z to 25/2100Z: Solar activity increased to low levels. Newly numbered Region 953 (S14E73) has partially rotated into view during the period and produced a C2 x-ray flare at 24/2256Z. A four spot Hsx alpha sunspot group is currently visible in white light. IB. Solar Activity Forecast: Solar activity is expected to be at very low to low levels. IIA. Geophysical Activity Summary 24/2100Z to 25/2100Z: The geomagnetic field was at quiet to unsettled levels. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to unsettled levels on 26 and 27 April. A recurrent coronal hole high speed stream is expected to become geoeffective on 29 April. Active to minor storm conditions are expected with the onset of the coronal hole. III. Event Probabilities 26 Apr-28 Apr Class M 05/10/10 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 25 Apr 077 Predicted 26 Apr-28 Apr 080/080/080 90 Day Mean 25 Apr 074 V. Geomagnetic A Indices Observed Afr/Ap 24 Apr 005/004 Estimated Afr/Ap 25 Apr 005/005 Predicted Afr/Ap 26 Apr-28 Apr 005/005-005/005-015/025 VI. Geomagnetic Activity Probabilities 26 Apr-28 Apr A. Middle Latitudes Active 10/10/30 Minor storm 01/01/15 Major-severe storm 01/01/10 B. High Latitudes Active 10/10/45 Minor storm 05/05/20 Major-severe storm 01/01/15