IEVref:845-29-108ID:
Language:enStatus: Standard
Term: luminous turbidity factor
Synonym1:
Synonym2:
Synonym3:
Symbol: Tv
Definition: quotient of the vertical optical thickness of a real turbid atmosphere and the vertical optical thickness of the pure and dry atmosphere (Rayleigh atmosphere), related to the visible part of the solar spectrum

Note 1 to entry: The luminous turbidity factor can be expressed by

T v = ln( E vs / E v ) a v m MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadsfadaWgaaWcbaGaaeODaaqabaGccqGH9aqpdaWcaaqaaiabgkHi TKaaajGacYgacaGGUbGccaGGOaGaamyramaaBaaaleaacaqG2bGaae 4CaaqabaGccaGGVaGaamyramaaBaaaleaacaqG2baabeaakiaacMca aeaacaWGHbWaaSbaaSqaaiaabAhaaeqaaOGaamyBaaaaaaa@4757@

where 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, and m is the relative optical air mass.

Note 2 to entry: The luminous turbidity factor has unit one.


Publication date:2020-12
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