The featured graph and images are from the Ames SchoolNet Site and Webcamera. The time series is of instantaneous solar radiation sampled every minute. Notice how the curve transitions from smooth to choppy in the afternoon and then smooth again just before sunset. The shape of this curve tells the story shown in the featured 3 webcam images, a transition from clear skies to party clooudy to mostly clear at sunset. The solar radiation curve becomes choppy as the sun plays peekaboo with the clouds as opposed to being a pure function of location in the sky during optically clear situations.

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Tags:   sun   radiation