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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 34 — Dec. 1, 2005
  • pp: 7378–7393

Reevaluation of the quondam dust trend in the middle atmosphere

Miroslav Kocifaj and Helmuth Horvath  »View Author Affiliations


Applied Optics, Vol. 44, Issue 34, pp. 7378-7393 (2005)
http://dx.doi.org/10.1364/AO.44.007378


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Abstract

Quondam lunar eclipse photometry data offered valuable information on the optical properties of the middle atmosphere, including dust particles. However, in comparison with nonspherical grains, the simple model of spherical particles has a different effect on solar radiation penetrating horizontally through the atmosphere. It is shown that the systems, in which the smallest size fraction of dust particles dominates, reduce irradiation of the Earth's shadow more efficiently if the grains are of irregular shape. In contrast, the populations contaminated by a certain amount of large particles cause an opposite effect. Depending on the actual form of the size distribution function of the irregular grains, the irradiance within the center of the Earth's shadow may change by 2 orders of magnitude in the visible spectrum. It is therefore evident that dust properties retrieved in the past are eligible candidates for reevaluation to correct a view on the dust trend in the middle atmosphere. Sample calculations are presented for the lunar eclipse observed on 19 January 1954.

© 2005 Optical Society of America

OCIS Codes
(010.1110) Atmospheric and oceanic optics : Aerosols
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(290.2200) Scattering : Extinction

ToC Category:
Atmospheric and Oceanic Optics

Citation
Miroslav Kocifaj and Helmuth Horvath, "Reevaluation of the quondam dust trend in the middle atmosphere," Appl. Opt. 44, 7378-7393 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-34-7378

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