:Product: 20010820RSGA.txt :Issued: 2001 Aug 20 2200 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 232 Issued at 2200Z on 20 Aug 2001 IA. Analysis of Solar Active Regions and Activity from 19/2100Z to 20/2100Z: Solar activity was low. Both Regions 9582 (N28E05) and 9585 (N15E22) produced C-class subflares. The most interesting activity was an eruptive prominence on the limb (EPL) near southeast 20 at about 20/1920 UTC. The event was accompanied by a long-duration C2 x-ray burst, a type II sweep, and other radio output that included 120 sfu at 2695 Mhz and 8100 sfu at 245 Mhz. New Regions 9589 (N15W21) and 9590 (S28E80) were numbered. IB. Solar Activity Forecast: Solar activity is expected to be low. IIA. Geophysical Activity Summary 19/2100Z to 20/2100Z: The geomagnetic field was quiet to unsettled. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled. III. Event Probabilities 21 Aug-23 Aug Class M 10/10/10 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 20 Aug 156 Predicted 21 Aug-23 Aug 155/155/155 90 Day Mean 20 Aug 152 V. Geomagnetic A Indices Observed Afr/Ap 19 Aug 008/012 Estimated Afr/Ap 20 Aug 008/011 Predicted Afr/Ap 21 Aug-23 Aug 010/010-010/008-005/008 VI. Geomagnetic Activity Probabilities 21 Aug-23 Aug A. Middle Latitudes Active 15/15/10 Minor storm 01/01/01 Major-severe storm 01/01/01 B. High Latitudes Active 20/20/15 Minor storm 05/05/01 Major-severe storm 01/01/01