:Product: 0531RSGA.txt :Issued: 2007 May 31 2203 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 151 Issued at 2200Z on 31 May 2007 IA. Analysis of Solar Active Regions and Activity from 30/2100Z to 31/2100Z: Solar activity remained at low levels. Region 958 (S13E35) continues to decay. A C1 x-ray flare occurred at 31/1253Z, and appeared to have come from a source region just beyond the east limb. No new regions were numbered today. IB. Solar Activity Forecast: Solar activity is expected to be at very low to low levels. IIA. Geophysical Activity Summary 30/2100Z to 31/2100Z: The geomagnetic field was at quiet levels. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels again today. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at predominantly quiet levels on 01 and 02 June. A recurrent coronal hole high speed stream is expected to become geoeffective on 03 June. Active conditions are possible with the onset of the coronal hole. III. Event Probabilities 01 Jun-03 Jun Class M 10/10/10 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 31 May 075 Predicted 01 Jun-03 Jun 075/075/075 90 Day Mean 31 May 073 V. Geomagnetic A Indices Observed Afr/Ap 30 May 003/004 Estimated Afr/Ap 31 May 003/005 Predicted Afr/Ap 01 Jun-03 Jun 003/005-003/005-010/015 VI. Geomagnetic Activity Probabilities 01 Jun-03 Jun A. Middle Latitudes Active 15/15/25 Minor storm 01/01/10 Major-severe storm 01/01/05 B. High Latitudes Active 15/15/30 Minor storm 05/05/15 Major-severe storm 01/01/10