:Product: 1018RSGA.txt :Issued: 2007 Oct 18 2202 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 291 Issued at 2200Z on 18 Oct 2007 IA. Analysis of Solar Active Regions and Activity from 17/2100Z to 18/2100Z: Solar activity was very low. The visible disk remains spotless. IB. Solar Activity Forecast: Solar activity is expected to remain very low. IIA. Geophysical Activity Summary 17/2100Z to 18/2100Z: The geomagnetic field began the summary period at quiet levels and became briefly active between 09-12Z as a recurrent coronal hole high speed stream became geoeffective. Activity since 12Z has been quiet to unsettled. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to range from unsettled to active for the next three days under the continued influence of the high speed stream. III. Event Probabilities 19 Oct-21 Oct Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 18 Oct 068 Predicted 19 Oct-21 Oct 067/067/067 90 Day Mean 18 Oct 068 V. Geomagnetic A Indices Observed Afr/Ap 17 Oct 000/001 Estimated Afr/Ap 18 Oct 010/010 Predicted Afr/Ap 19 Oct-21 Oct 010/015-012/012-010/008 VI. Geomagnetic Activity Probabilities 19 Oct-21 Oct A. Middle Latitudes Active 20/20/20 Minor storm 10/15/10 Major-severe storm 05/10/05 B. High Latitudes Active 35/26/15 Minor storm 15/14/10 Major-severe storm 10/05/01