Extinction cross section

From Glossary of Meteorology
Revision as of 14:12, 20 February 2012 by imported>Perlwikibot
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)



extinction cross section

(Also called attenuation cross section, especially for radar and radio wave propagation.) The area that, when multiplied by the irradiance of electromagnetic waves incident on an object, gives the total radiant flux scattered and absorbed by the object.

Customary usage in radar describes the attenuation cross section as the area that, when multiplied by the power density of incident plane-wave radiation, gives the power removed from the beam by absorption and scattering. For a propagation medium consisting of a dispersion of scattering and absorbing objects, the volume extinction coefficient (m2m-3 or m-1) at a given location in the medium is the sum of the extinction cross sections of all the objects in a unit volume centered at the location.
Compare scattering cross section, absorption cross section.


Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.