:Product: 0318RSGA.txt :Issued: 2007 Mar 18 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 077 Issued at 2200Z on 18 Mar 2007 IA. Analysis of Solar Active Regions and Activity from 17/2100Z to 18/2100Z: Solar activity was very low. No flares were observed during the past 24 hours. The visible solar disk remains spotless. IB. Solar Activity Forecast: Solar activity is expected to be very low. IIA. Geophysical Activity Summary 17/2100Z to 18/2100Z: The geomagnetic field was quiet to unsettled. Solar wind speed varied during the past 24 hours, from initial values around 520 km/s, to values around 430 km/s at approximately 1540Z, to values around 460 km/s at forecast issue time. The greater than 2 MeV electron flux at geosynchronous orbit remained at high levels today. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet for the next three days (19-21 March). III. Event Probabilities 19 Mar-21 Mar Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 18 Mar 071 Predicted 19 Mar-21 Mar 070/070/070 90 Day Mean 18 Mar 078 V. Geomagnetic A Indices Observed Afr/Ap 17 Mar 008/008 Estimated Afr/Ap 18 Mar 003/005 Predicted Afr/Ap 19 Mar-21 Mar 005/005-005/005-005/005 VI. Geomagnetic Activity Probabilities 19 Mar-21 Mar A. Middle Latitudes Active 10/10/10 Minor storm 05/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor storm 05/05/05 Major-severe storm 01/01/01