Measurements of the aureole phase function during heavy rain

The results of ground-based forward-scattering UV radiation measurements during heavy rain are reported. A distinctive diffraction pattern was observed with secondary peaks at 1.2 degrees and 1.9 degrees . It is suggested that millimeter-sized raindrops break up and generate 10- mu m particle spray. It is concluded that a rain model must include the spray effect to predict correctly the propagation of thermal IR radiation near the ground.<
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