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Chapman function : ウィキペディア英語版 | Chapman function A Chapman function describes the integration of atmospheric absorption along a slant path on a spherical earth, relative to the vertical case. It applies for any quantity with a concentration decreasing exponentially with increasing altitude. To a first approximation, valid at small zenith angles, the Chapman function for optical absorption is equal to : where ''z'' is the zenith angle and sec denotes the secant function. The Chapman function is named after Sydney Chapman. == See also ==
* Atmospheric physics * Ionosphere
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