Multiple fluorescent scattering of N2 ultraviolet emissions in the atmospheres of the earth and Titan

Details Multiple fluorescent scattering of N2 ultraviolet emissions in the atmospheres of the earth and Titan Multiple fluorescent scattering of N2 ultraviolet emissions in the atmospheres of the earth and Titan

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.4784c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, June 1, 1983, p. 4784-4792.

Physics

15

Auroras, Dayglow, Fluorescence, Nitrogen, Radiative Transfer, Titan, Ultraviolet Radiation, Earth Atmosphere, Lyman Spectra, Molecular Rotation, Photoabsorption, Satellite Atmospheres, Planets, Earth, Saturn, Satellites, Titan, Fluorescence, Scattering, Nitrogen, Gases, Ultraviolet, Emissions, Wavelengths, Atmosphere, Absorption, Auroras, Dayglow, Procedure, Calculations, Models, Bands, Rotation, Structure, Excitation, Vibration, Temperature, Comparisons, Thermal Properties, Intensity, Brightness

Scientific paper

Multiple scattering in a plane-parallel radiative transfer model, and a line-by-line synthesis of individual bands, are used to calculate the absorption and reemission by N2 of the Lyman-Birge-Hopfield (LBH) and Birge-Hopfield (BH) band systems in both the earth aurora and the dayglow of Titan. Iteration through successive scatterings indicates that fewer than ten scatterings are important, even for the thickest bands. The excitation rate caused by multiple scattering is sensitive to the vibrational population distribution of the ambient N2, especially for the BH system in the earth aurora. The LBH system has an enhanced sensitivity to vibrational temperature on Titan, due to the rapidly changing photoabsorption cross section of CH4 around 1400 A. It is suggested that certain Rydberg bands should have an intensity profile similar to that of the BH bands.

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