:Product: 0520RSGA.txt :Issued: 2007 May 20 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 140 Issued at 2200Z on 20 May 2007 IA. Analysis of Solar Active Regions and Activity from 19/2100Z to 20/2100Z: Solar activity was very low. Region 956 (N04W18) produced a long-duration B6 flare at 20/0556Z, but no evidence of an associated CME has been observed. IB. Solar Activity Forecast: Solar activity is expected to be very low to low. IIA. Geophysical Activity Summary 19/2100Z to 20/2100Z: The geomagnetic field was quiet to unsettled. Solar wind speed remains slightly elevated at approximately 540 km/s due to a coronal hole high speed stream. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled for the next three days (21 - 23 May). III. Event Probabilities 21 May-23 May Class M 10/10/10 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 20 May 074 Predicted 21 May-23 May 075/075/075 90 Day Mean 20 May 074 V. Geomagnetic A Indices Observed Afr/Ap 19 May 010/012 Estimated Afr/Ap 20 May 006/010 Predicted Afr/Ap 21 May-23 May 008/012-005/010-005/005 VI. Geomagnetic Activity Probabilities 21 May-23 May A. Middle Latitudes Active 20/15/15 Minor storm 05/01/01 Major-severe storm 01/01/01 B. High Latitudes Active 30/25/15 Minor storm 15/15/05 Major-severe storm 05/01/01