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The satellites of the Defense Meteorological Satellite Program (DMSP) are a series of low-altitude (835 km) polar-orbiting satellites. Their primary purpose is to observe the tropospheric weather with a high-resolution (2.8 km) white light and infrared imaging system. The images of clouds, city lights, and auroras produced in the white light band by the Operational Linescan System (OLS) are well known. For example, Croft [1978] has shown several examples of nighttime images of city lights, oil field fires, auroras (northern or southern lights) and other nocturnal light sources.