IEVref:845-09-88ID:
Language:enStatus: Obsolete
Term: relative optical air mass
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Symbol: m
Definition: ratio of the slant optical thickness, δ(ε), to the vertical optical thickness, δ(0), of the atmosphere

m = δ(ε) /δ(0)

unit : 1

NOTE 1 – See Note 1 to 845-04-80.

NOTE 2 – When the curvature of the atmosphere and atmospheric refraction are neglected, m = 1/cos ε.


Publication date:1987
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