Computer Science – Numerical Analysis
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jqsrt..34...33b&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 34, July 1985, p. 33-53.
Computer Science
Numerical Analysis
6
Atmospheric Radiation, Earth Limb, Radiance, Spectral Energy Distribution, Thermodynamic Equilibrium, Upper Atmosphere, Carbon Dioxide, Emission Spectra, High Resolution, Line Spectra, Nonequilibrium Conditions, Numerical Analysis, Spectral Line Width, Voigt Effect
Scientific paper
A general numerical treatment of non-LTE infrared earthlimb emission line shapes using a recently developed computer code is presented, and it is shown how various analytical approximations of high accuracy can be used to provide important insights and to significantly shorten computation time. The solution of the radiation transport equation for the spectral radiance I(v) within nonoverlapping lines is expressed as a function of a weighted average of the ratio of the upper-level to the lower level populations n(u)/n(l) of the emitter and the total optical path along the line of sight. It is shown that in the line-center region the variation of R and hence of I(v) as a function of frequency reflects the variation in n(u)/n(l) as a function of height. The importance of using the Voigt emission line shape rather than the Doppler for optically thick lines in the mesosphere to properly predict band and line radiances is shown.
Bakshi P. M.
Bullitt M. K.
Picard Richard H.
Sharma Ramesh D.
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