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Proceedings Paper

Twilight Rayleigh scattering observed from ground and space
Author(s): J. Scott Evans; Douglas J. Strickland; Donald E. Anderson Jr.; Larry J. Paxton
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Paper Abstract

A model is presented which calculates intensities of Rayleigh-scattered sunlight to large solar zenith angles (SZAs). The intensity integrand contains appropriate transmission functions and a volume emission rate profile with SZA varying along the line-of-sight. The calculation is performed for a spherically-symmetric model atmosphere and allows for limb and nonlimb viewing. We compare O I 6300 A nightglow and N2(+) 4278 A auroral signals to their Rayleigh-scattered counterparts at various SZAs beyond the terminator, addressing the major problems encountered by operational sensors when a rapid change in scattered sunlight intensity occurs at the terminator. To illustrate the effects of baffling systems, we examine three simple baffle designs being considered for a nadir-viewing photometer system to be flown on Defense Meteorological Satellite Program (DMSP) Block 5D3 satellites. The results show how far these photometers must be beyond the terminator to make good airglow and auroral measurements.

Paper Details

Date Published: 22 January 1993
PDF: 14 pages
Proc. SPIE 1764, Ultraviolet Technology IV, (22 January 1993); doi: 10.1117/12.140865
Show Author Affiliations
J. Scott Evans, Computational Physics, Inc. (United States)
Douglas J. Strickland, Computational Physics, Inc. (United States)
Donald E. Anderson Jr., Computational Physics, Inc. (United States)
Larry J. Paxton, Johns Hopkins Univ. (United States)

Published in SPIE Proceedings Vol. 1764:
Ultraviolet Technology IV
Robert E. Huffman, Editor(s)

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