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.
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