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15 June 1994 SHARC-3: a model for infrared atmospheric radiance at high altitudes
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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.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, and Rebecca J. Healey "SHARC-3: a model for infrared atmospheric radiance at high altitudes", Proc. SPIE 2223, Characterization and Propagation of Sources and Backgrounds, (15 June 1994);

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