Computer Science
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jqsrt..33..453g&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 33, May 1985, p. 453-458. Research supported
Computer Science
10
Angular Distribution, Auroras, Dayglow, Optical Thickness, Radiative Transfer, Resonance Lines, Albedo, Emission Spectra, Lyman Beta Radiation, Voigt Effect
Scientific paper
The modeling of resonance lines in the aurorae and dayglow usually requires a large computer code to solve the radiative transfer problem. Here, a simple theory is presented that gives reasonable estimates of the emergent intensities, including the angular distribution, for very optically thick lines with internal sources. The method uses an extension of the H-functions (implying a semi-infinite atmosphere) and assumes that the source is monochromatic and may be reasonably represented by a Chapman profile. The theory is compared with detailed numerical calculations for resonance lines with Voigt emission line profiles, including the cases of both partial and complete frequency redistribution. The effects of frequency redistribution on the angular distribution of the emergent radiation and on the line profiles are also shown.
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