:Product: 20010726RSGA.txt :Issued: 2001 Jul 26 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 207 Issued at 2200Z on 26 Jul 2001 IA. Analysis of Solar Active Regions and Activity from 25/2100Z to 26/2100Z: Solar activity decreased to very low levels. Isolated B-class X-ray flares occurred. Region 9553 (N13W05) showed significant growth, almost doubling its area during the last 24 hours. However, it remained simply structured. Region 9543 (S24W70) continued to gradually decay. The remaining sunspot groups were small, stable and simply structured. New Regions 9557 (S18E72) and 9558 (N18W30) were numbered. IB. Solar Activity Forecast: Solar activity is expected to be at very low to low levels. IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z: Geomagnetic field activity was at quiet to active levels. Active levels occurred due to coronal effects. IIB. Geophysical Activity Forecast: Geomagnetic field activity is expected to be at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit may reach high levels early in the forecast period. III. Event Probabilities 27 Jul-29 Jul Class M 20/20/20 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 26 Jul 123 Predicted 27 Jul-29 Jul 125/120/120 90 Day Mean 26 Jul 154 V. Geomagnetic A Indices Observed Afr/Ap 25 Jul 021/022 Estimated Afr/Ap 26 Jul 015/016 Predicted Afr/Ap 27 Jul-29 Jul 010/012-010/010-008/008 VI. Geomagnetic Activity Probabilities 27 Jul-29 Jul A. Middle Latitudes Active 25/25/20 Minor storm 10/10/05 Major-severe storm 01/01/01 B. High Latitudes Active 30/30/25 Minor storm 15/15/10 Major-severe storm 05/05/01