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Proceedings Paper

Blue twilight in a simple atmosphere
Author(s): Philip A. Ekstrom
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Paper Abstract

Assuming a curved exponential atmosphere with beam attenuation and isotropic scattering both proportional to density, we model three regimes that each become dominant in turn as the sun sets. This drastic simplification of the earth's real atmosphere both provides insight to guide system design and is able to fit over an irradiance range exceeding nine decades a set of narrowband measurements of blue light intensity made in the natural environment on clear days. The single-scattering regime involves only overall illumination (or cloudiness) as an adjustable parameter and appears especially relevant to animal geolocation based on measurement of diffuse irradiance.

Paper Details

Date Published: 5 September 2002
PDF: 9 pages
Proc. SPIE 4815, Atmospheric Radiation Measurements and Applications in Climate, (5 September 2002); doi: 10.1117/12.482305
Show Author Affiliations
Philip A. Ekstrom, Lotek Wireless and CEFAS (Canada)

Published in SPIE Proceedings Vol. 4815:
Atmospheric Radiation Measurements and Applications in Climate
Joseph A. Shaw, Editor(s)

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