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Why is reported solar radiation sometimes greater on a partly cloudy day than on a clear day?

April 26, 2017clear cloudy greater Partly radiation reported solar

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Why is reported solar radiation sometimes greater on a partly cloudy day than on a clear day?

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[TOC] We use a Licor photometer to measure solar radiation. This sensor is sensitive to the short wave radiation. Clouds reflect these short waves towards the sensor. So, when the geometry is just right, white clouds will add to direct sunlight.