IEVref:845-09-86ID:
Language:enStatus: Obsolete
Term: optical thickness of the atmosphere
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Symbol: δ(ε)
Definition: quantity defined by the formula

δ(ε) = — In (Φ'e/Φe)

where Φe is the radiant flux of a collimated beam entering the upper limit layers of the atmosphere at an angle ε to the vertical, and Φ'e the attenuated radiant flux of that beam reaching the surface of the Earth

unit : 1

NOTE 1 – See also 845-04-80.

NOTE 2 – In English, the term optical depth is sometimes used instead of optical thickness


Publication date:1987
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