IEVref:845-29-106ID:
Language:enStatus: Standard
Term: optical thickness, <of the atmosphere>
Synonym1: optical depth, <of the atmosphere>
Synonym2:
Synonym3:
Symbol: δ(ε)
Definition:

δ(ε)=ln Φ e Φ e MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai abes7aKjaacIcacqaH1oqzcaGGPaGaeyypa0JaeyOeI0IaciiBaiaa c6gadaWcaaqaaiqbfA6agzaafaWaaSbaaSqaaiaabwgaaeqaaaGcba GaeuOPdy0aaSbaaSqaaiaabwgaaeqaaaaaaaa@44D7@

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 MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai qbfA6agzaafaWaaSbaaSqaaiaabwgaaeqaaaaa@39B4@ is the attenuated radiant flux of that beam reaching the surface of the Earth

Note 1 to entry: See also "spectral optical thickness".

Note 2 to entry: The optical thickness has unit one.

Note 3 to entry: This entry was numbered 845-09-86 in IEC 60050-845:1987.


Publication date:2020-12
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