luminous turbidity factor [Tv]

ratio of the vertical optical thickness of a real turbid atmosphere to the vertical optical thickness of the pure and dry atmosphere (Rayleigh atmosphere), related to the visible part of the solar spectrum

Unit: 1



Evs is the direct-beam illuminance on a horizontal surface (at the ground);

Ev is the extraterrestrial horizontal illuminance;

av is the luminous extinction coefficient;

m is the relative optical air mass.

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