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Proceedings Paper

SHARC-3: a model for infrared atmospheric radiance at high altitudes
Author(s): John H. Gruninger; Robert L. Sundberg; James W. Duff; Lawrence S. Bernstein; Michael W. Matthew; Steven M. Adler-Golden; David C. Robertson; Ramesh D. Sharma; James H. Brown; Rebecca J. Healey
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Paper Abstract

This paper describes the development of a new version of the SHARC code, SHARC-3, which includes the ability to simulate changing atmospheric conditions along the line-of-sight (LOS) paths being calculated. SHARC has been developed by the U.S. Air Force for the rapid and accurate calculation of upper atmospheric IR radiance and transmittance spectra with a resolution of better than 1 cm-1 in the 2 to 40 micrometers (250 to 5,000 cm-1) wavelength region for arbitrary LOSs in the 50 - 300 km altitude regime. SHARC accounts for the production, loss, and energy transfer processes among the molecular vibrational states important to this spectral region. Auroral production and excitation of CO2, NO, and NO+ are included in addition to quiescent atmospheric processes. Calculated vibrational temperatures are found to be similar to results from other non-LTE codes, and SHARC's equivalent-width spectral algorithm provides very good agreement with much more time-consuming `exact' line-by-line methods. Calculations and data comparisons illustrating the features of SHARC-3 are presented.

Paper Details

Date Published: 15 June 1994
PDF: 10 pages
Proc. SPIE 2223, Characterization and Propagation of Sources and Backgrounds, (15 June 1994); doi: 10.1117/12.177908
Show Author Affiliations
John H. Gruninger, Spectral Sciences, Inc. (United States)
Robert L. Sundberg, Spectral Sciences, Inc. (United States)
James W. Duff, Spectral Sciences, Inc. (United States)
Lawrence S. Bernstein, Spectral Sciences, Inc. (United States)
Michael W. Matthew, Spectral Sciences, Inc. (United States)
Steven M. Adler-Golden, Spectral Sciences, Inc. (United States)
David C. Robertson, Spectral Sciences, Inc. (United States)
Ramesh D. Sharma, Air Force Phillips Lab. (United States)
James H. Brown, Air Force Phillips Lab. (United States)
Rebecca J. Healey, Yap Analytics, Inc. (United States)


Published in SPIE Proceedings Vol. 2223:
Characterization and Propagation of Sources and Backgrounds
Wendell R. Watkins; Dieter Clement, Editor(s)

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