21 December 1994 Color temperature and pseudoemission properties of atmospheric dust
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The Planck law holds that brightness of a real thermal radiation source can be expressed in tenns of radiant emittance M(A,T) of absolutely black body (ABB) and function c(2) which establishes similarity of emitting properties between a real body and ABB. If in the spectral interval . the selective properties of the radiation source can be neglected, then the coefficient of body blackness c is often used in place of function c(A). During the past several years when the spacecraft measurements were carried out to investigate the Earth's natural resources the approach based on the assumption that each element of the underlying surface represents a secondary radiation source was employed1. If the selective properties of radiation of this source are neglected, then its spectral function of brightness can be represented as the Planck relation by replacing there the energy temperature T by the color temperature T. In the visible spectral range the Earth's atmosphere can be considered nonselective since several narrow water-vapor absorption lines and an ozone absorption line (Chappear) do not strongly affect its general form. In this case it is also possible to extend the approach used for investigating the natural resources to studying the Earth's atmosphere. In our paper we discuss some calculational results of determining T and c of the solar radiation brightness field scattered in the atmosphere.
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V. P. Galileiskii, A. M. Morozov, and V. K. Oshlakov "Color temperature and pseudoemission properties of atmospheric dust", Proc. SPIE 2312, Optics in Atmospheric Propagation and Random Phenomena, (21 December 1994); doi: 10.1117/12.197358; https://doi.org/10.1117/12.197358

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