Turbidity Factor

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Turbidity Factor

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A measure of the atmospheric transmission of incident solar radiation. If I₀ is the flux density of the solar beam just outside the earth's atmosphere, I the flux density measured at the earth's surface with the sun at a zenith distance which implies an optical air mass m , and I_m,w the intensity which would be observed at the earth's surface for a pure atmosphere containing one centimeter of perceptible water viewed through the given optical air mass, then Linke's turbidity factor θ is given by

θ = (ln I₀ - ln I)/(ln I₀ - ln I_m,w) [[/a>|/a>

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References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use