:Product: 0924RSGA.txt :Issued: 2007 Sep 24 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 267 Issued at 2200Z on 24 Sep 2007 IA. Analysis of Solar Active Regions and Activity from 23/2100Z to 24/2100Z: 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 23/2100Z to 24/2100Z: The geomagnetic field ranged from quiet to active with a period of minor storming observed at middle latitudes. An elevated solar wind speed due to a coronal hole high speed stream contributed to the activity. Solar wind speed remains elevated at approximately 620 km/s at the time of issue. 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 quiet to unsettled with a chance for active periods on 25 September due to the ongoing coronal hole high speed stream. Expect quiet to unsettled conditions on 26 - 27 September. III. Event Probabilities 25 Sep-27 Sep Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 24 Sep 066 Predicted 25 Sep-27 Sep 066/066/067 90 Day Mean 24 Sep 070 V. Geomagnetic A Indices Observed Afr/Ap 23 Sep 011/015 Estimated Afr/Ap 24 Sep 009/010 Predicted Afr/Ap 25 Sep-27 Sep 007/008-005/005-005/008 VI. Geomagnetic Activity Probabilities 25 Sep-27 Sep A. Middle Latitudes Active 15/10/10 Minor storm 05/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 20/10/15 Minor storm 05/05/05 Major-severe storm 01/01/01