:Product: 0515RSGA.txt :Issued: 2010 May 15 2200 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 135 Issued at 2200Z on 15 May 2010 IA. Analysis of Solar Active Regions and Activity from 14/2100Z to 15/2100Z: Solar activity was very low. No flares occurred. The visible disk was spotless. IB. Solar Activity Forecast: Solar activity is expected to be very low during the period (16 - 18 May). IIA. Geophysical Activity Summary 14/2100Z to 15/2100Z: Geomagnetic field activity was at quiet levels throughout the period. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels during the period. IIB. Geophysical Activity Forecast: Geomagnetic field activity is expected to be at mostly quiet levels during day 1 (16 May) with a chance for unsettled levels due to possible coronal hole effects. Field activity is expected to be at quiet levels during days 2 - 3 (17 - 18 May). III. Event Probabilities 16 May-18 May Class M 01/01/01 Class X 01/01/01 Proton 01/01/01 PCAF Green IV. Penticton 10.7 cm Flux Observed 15 May 070 Predicted 16 May-18 May 070/072/072 90 Day Mean 15 May 080 V. Geomagnetic A Indices Observed Afr/Ap 14 May 001/003 Estimated Afr/Ap 15 May 002/005 Predicted Afr/Ap 16 May-18 May 007/007-005/005-005/005 VI. Geomagnetic Activity Probabilities 16 May-18 May A. Middle Latitudes Active 15/10/05 Minor storm 01/01/01 Major-severe storm 01/01/01 B. High Latitudes Active 20/15/05 Minor storm 05/01/01 Major-severe storm 01/01/01