Optical Depth
978-613-5-46288-3
6135462881
92
2011-05-18
34.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Optical depth, or optical thickness is a measure of transparency, and is defined as the negative logarithm of the fraction of radiation (e.g., light) that is not scattered or absorbed on a path. The optical depth is a measure of the proportion of radiation absorbed or scattered along a path through a partially transparent medium; the optical depth to a close-by object is zero; as the distance to the object increases, so does the optical depth. In atmospheric sciences, one often refers to the optical depth of the atmosphere as corresponding to the vertical path from Earth's surface to outer space; at other times the optical path is from the observer's altitude to outer space. Since τ refers to a vertical path, the optical depth for a slant path is τ' = mτ, where m is called the relative airmass, and for a plane-parallel atmosphere it is determined as m = 1 / cosθ, where θ is the zenith angle corresponding to the given path.
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Físicas, astronomia
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