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<p><strong>Abstract.</strong> Changing cloud cover is a major source of solar radiation variability and poses challenges for the integration of solar energy. A compact and economical system is presented that measures cloud shadow motion vectors to estimate power plant ramp rates and provide short-term solar irradiance forecasts. The cloud shadow speed sensor (CSS) is constructed using an array of luminance sensors and a high-speed data acquisition system to resolve the progression of clouddoi:10.5194/amt-7-1693-2014 fatcat:av3eau2tdff7vlhibaiunf735a