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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 34 — Dec. 1, 2008
  • pp: H157–H166

Simulating halos and coronas in their atmospheric environment

Stanley David Gedzelman  »View Author Affiliations


Applied Optics, Vol. 47, Issue 34, pp. H157-H166 (2008)
http://dx.doi.org/10.1364/AO.47.00H157


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Abstract

Models are developed that simulate the light and color of the sky and of circular halos and coronas as a function of atmospheric pressure, cloud height, width, and optical depth, solar zenith angle, aerosol concentration and size, and ozone content. Halos, coronas, and skylight are treated as singly scattered sunbeams that are depleted in their passage through the atmosphere and cloud. Multiple scattering is included only for background cloud light. Halos produced by hexagonal crystal prisms and coronas produced by monodisperse droplets are visible for cloud optical depths in the range 0.0003 τ cld 7 and are brightest and most colorful when τ cld is somewhat less than the cosine of the observer’s zenith angle. When the Sun is low in the sky, halos and coronas can be bright only at smaller cloud optical depths and tend to be faint at their bottoms when produced in high cloud layers but can be bright at the horizon when produced by narrow cloud cells near ground level.

© 2008 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.2940) Atmospheric and oceanic optics : Ice crystal phenomena
(010.4950) Atmospheric and oceanic optics : Ozone
(010.1615) Atmospheric and oceanic optics : Clouds
(010.1690) Atmospheric and oceanic optics : Color
(010.5620) Atmospheric and oceanic optics : Radiative transfer

History
Original Manuscript: April 30, 2008
Manuscript Accepted: June 6, 2008
Published: October 1, 2008

Citation
Stanley David Gedzelman, "Simulating halos and coronas in their atmospheric environment," Appl. Opt. 47, H157-H166 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-34-H157

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