:Product: 1025RSGA.txt :Issued: 2007 Oct 25 2134 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Weather Prediction Center and the U.S. Air Force. # Joint USAF/NOAA Report of Solar and Geophysical Activity SDF Number 298 Issued at 2200Z on 25 Oct 2007 IA. Analysis of Solar Active Regions and Activity from 24/2100Z to 25/2100Z: Solar activity was at very low levels. The visible solar disk remains spotless. IB. Solar Activity Forecast: Solar activity is expected to be at very low levels. IIA. Geophysical Activity Summary 24/2100Z to 25/2100Z: The geomagnetic field ranged from quiet to minor storm conditions, major storm levels were observed at high latitudes. The ACE spacecraft observed a co-rotating interaction region at 25/1040Z. Solar wind speed has increased to approximately 700 km/s, and Bz has ranged between +/-17 nT, indicating the onset of a coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels today. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at unsettled to active conditions due to the coronal hole high speed stream throughout the forecast period (26 - 28 October). Minor storm levels at middle latitudes and major storm conditions at high latitudes are possible on day one of the forecast period. III. Event Probabilities 26 Oct-28 Oct Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 25 Oct 067 Predicted 26 Oct-28 Oct 067/067/067 90 Day Mean 25 Oct 068 V. Geomagnetic A Indices Observed Afr/Ap 24 Oct 002/003 Estimated Afr/Ap 25 Oct 015/015 Predicted Afr/Ap 26 Oct-28 Oct 020/020-010/012-008/010 VI. Geomagnetic Activity Probabilities 26 Oct-28 Oct A. Middle Latitudes Active 35/20/15 Minor storm 20/15/10 Major-severe storm 10/05/01 B. High Latitudes Active 35/25/20 Minor storm 25/20/15 Major-severe storm 15/05/01