:Product: 0821RSGA.txt :Issued: 2008 Aug 21 2200 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 234 Issued at 2200Z on 21 Aug 2008 IA. Analysis of Solar Active Regions and Activity from 20/2100Z to 21/2100Z: Solar activity was very low. IB. Solar Activity Forecast: Solar activity is expected to be very low. IIA. Geophysical Activity Summary 20/2100Z to 21/2100Z: The geomagnetic field was mostly quiet. 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 for the next two days (22-23 August) and quiet to unsettled on day three (24 August). III. Event Probabilities 22 Aug-24 Aug Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 21 Aug 067 Predicted 22 Aug-24 Aug 066/066/066 90 Day Mean 21 Aug 066 V. Geomagnetic A Indices Observed Afr/Ap 20 Aug 005/006 Estimated Afr/Ap 21 Aug 005/005 Predicted Afr/Ap 22 Aug-24 Aug 005/005-005/005-007/008 VI. Geomagnetic Activity Probabilities 22 Aug-24 Aug A. Middle Latitudes Active 05/05/10 Minor storm 01/01/01 Major-severe storm 01/01/01 B. High Latitudes Active 05/05/20 Minor storm 01/01/05 Major-severe storm 01/01/01