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Sunshine is The model representation of cloud layers is used to assess how much direct solar (shortwave) radiation reaches the Earth's surface.  The accumulated sunshine duration at each point is calculated from the length of time for which that the direct solar (shortwave) radiation at the Earth's surface, falling on a plane perpendicular to the direction of the Sunsun, is greater than or equal to 120 W m⁻².   The minimum solar intensity level of 120 W m⁻² is defined by the World Meteorological Organisation.  This is consistent with observed values of sunshine duration from a Campbell-Stokes recorder which can only measure moderately intense sunlight and brighter.

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