The solution of radiative transfer problems in molecular bands without the LTE assumption by accelerated lambda iteration methods

Details The solution of radiative transfer problems in molecular bands without the LTE assumption by accelerated lambda iteration methods The solution of radiative transfer problems in molecular bands without the LTE assumption by accelerated lambda iteration methods

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jqsrt..46..347k&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 46, Nov. 1991, p. 347-365. Research supported

Astronomy and Astrophysics

Astrophysics

9

Iterative Solution, Molecular Spectra, Planetary Atmospheres, Radiative Transfer, Local Thermodynamic Equilibrium, Rotational Spectra, Spectral Bands, Upper Atmosphere, Vibrational Spectra

Scientific paper

An iterative method based on the use of approximate transfer operators, which was designed initially to solve multilevel NLTE line formation problems in stellar atmospheres, is adapted and applied to the solution of the NLTE molecular band radiative transfer in planetary atmospheres. The matrices to be constructed and inverted are much smaller than those used in the traditional Curtis matrix technique, which makes possible the treatment of more realistic problems using relatively small computers. This technique converges much more rapidly than straightforward iteration between the transfer equation and the equations of statistical equilibrium. A test application of this new technique to the solution of NLTE radiative transfer problems for optically thick and thin bands (the 4.3 micron CO2 band in the Venusian atmosphere and the 4.7 and 2.3 micron CO bands in the earth's atmosphere) is described.

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