:Product: 20010526RSGA.txt :Issued: 2001 May 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 146 Issued at 2200Z on 26 May 2001 IA. Analysis of Solar Active Regions and Activity from 25/2100Z to 26/2100Z: Solar activity was low. Region 9468 (N06W02) continued to produce small C-class subflares, the largest being a C2/Sf at 25/2210 UTC. Other disk regions were relatively quiet. New Regions numbered include 9473 (N12E12), 9474 (N18E53), and 9475 (N17E71). All are small and magnetically simple. IB. Solar Activity Forecast: Solar activity is expected to be low to moderate. An isolated low-level M-class flare remains possible from Region 9468. Additional C-class activity is likely. IIA. Geophysical Activity Summary 25/2100Z to 26/2100Z: The geomagnetic field was quiet to unsettled. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled. III. Event Probabilities 27 May-29 May Class M 30/30/30 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 26 May 147 Predicted 27 May-29 May 145/140/140 90 Day Mean 26 May 169 V. Geomagnetic A Indices Observed Afr/Ap 25 May 006/008 Estimated Afr/Ap 26 May 008/008 Predicted Afr/Ap 27 May-29 May 015/015-010/015-008/008 VI. Geomagnetic Activity Probabilities 27 May-29 May A. Middle Latitudes Active 20/15/10 Minor storm 05/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 25/20/15 Minor storm 05/05/05 Major-severe storm 01/01/01