Light scattering by ice crystals of cirrus clouds: comparison of the physical optics methods. (October 2016)

• Record Type: Journal Article
• Authors: Konoshonkin, Alexander V.; Kustova, Natalia V.; Borovoi, Anatoli G.; Grynko, Yevgen; Förstner, Jens
• Is Part Of: Journal of quantitative spectroscopy & radiative transfer. Volume 182(2016)
• Page Start: 12
• Page End: 23
• Publication Date: 2016-10
• Subjects: Light scattering -- Physical optics approximation -- Diffraction -- Ice crystals -- Beam-splitting code; Spectrum analysis -- Periodicals; Radiation -- Periodicals; Analyse spectrale -- Périodiques; Rayonnement -- Périodiques; Radiation; Spectrum analysis; Periodicals; 543.0858
• DOI: 10.1016/j.jqsrt.2016.05.006
• Languages: English
• ISSNs: 0022-4073

Abstract

Abstract: The physical optics approximations are derived from the Maxwell equations. The scattered field equations by Kirchhoff, Stratton-Chu, Kottler and Franz are compared and discussed. It is shown that in the case of faceted particles, these equations reduce to a sum of the diffraction integrals, where every diffraction integral is associated with one plane–parallel optical beam leaving a particle facet. In the far zone, these diffraction integrals correspond to the Fraunhofer diffraction patterns. The paper discusses the E-, M- and (E, M)-diffraction theories as applied to ice crystals of cirrus clouds. The comparison to the exact solution obtained by the discontinuous Galerkin time domain method shows that the Kirchhoff diffraction theory is preferable. Highlights: The physical optics methods have been compared. The scattered field equations can be reduced to a sum of the diffraction integrals. The comparison shows that the Kirchhoff diffraction theory is preferable.