Keywords: Noontime direct beam terrestrial solar radiation intensity at sea level.png en This is a graph of the direct beam solar radiation intensity versus day of the year at sea level for 30 35 40 and 45 degrees north latitude at solar noon The graph is based on a model published in an article by J L Threlkeld and R C Jordan Trans ASHRAE Vol 64 p 45 1958 The graph shows the typical value for direct beam solar irradiance throughout the year under clear-sky conditions with sunlight at normal incidence to the collector surface own Jfedison 2008-05-10 Unidentified graphs Line charts |