:Product: 0416RSGA.txt :Issued: 2010 Apr 16 2201 UTC # Prepared jointly by the U.S. Dept. of Commerce, NOAA, # Space Weather Prediction Center and the U.S. Air Force. # Joint USAF/NOAA Report of Solar and Geophysical Activity SDF Number 106 Issued at 2200Z on 16 Apr 2010 IA. Analysis of Solar Active Regions and Activity from 15/2100Z to 16/2100Z: Solar activity was very low. No flares were observed during the last 24 hours. The disk remained spotless. IB. Solar Activity Forecast: Solar activity is expected to be very low for the next three days (17-19 April). IIA. Geophysical Activity Summary 15/2100Z to 16/2100Z: The geomagnetic field was quiet during the last 24 hours. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be quiet to unsettled with a slight chance for isolated active periods at high latitudes for days one and two (17-18 April) due to effects from the CME observed on 13 April. Quiet to unsettled levels with isolated active periods at high latitudes are expected for day three (19 April) due to a coronal hole wind stream. III. Event Probabilities 17 Apr-19 Apr Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF green IV. Penticton 10.7 cm Flux Observed 16 Apr 075 Predicted 17 Apr-19 Apr 077/078/079 90 Day Mean 16 Apr 082 V. Geomagnetic A Indices Observed Afr/Ap 15 Apr 005/008 Estimated Afr/Ap 16 Apr 003/004 Predicted Afr/Ap 17 Apr-19 Apr 007/008-008/010-007/008 VI. Geomagnetic Activity Probabilities 17 Apr-19 Apr A. Middle Latitudes Active 25/30/25 Minor storm 01/05/01 Major-severe storm 01/01/01 B. High Latitudes Active 30/35/30 Minor storm 10/15/10 Major-severe storm 01/01/01