Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.3326m&link_type=abstract
American Astronomical Society, DPS meeting #37, #33.26; Bulletin of the American Astronomical Society, Vol. 37, p.697
Astronomy and Astrophysics
Astronomy
Scientific paper
Three models (a general multilevel model, a 3-level and a 2-level simplified models) of the 3.3-μ m infrared emissions of methane in the atmosphere of Mars have been carried out and the results are presented. This modeling considers the effects of non-Local Thermodynamic Equilibrium (non-LTE) in the population of the vibrational states of methane and is oriented to assess their potential impact on the remote sensing of this gas. Non-LTE effects have not been considered in the recent interpretation of measurements for the inference of CH4 abundances in the atmosphere of Mars. Our results indicate that, at nighttime, the vibrational levels responsible for the major emissions of CH4 at 3.3-μ m are found to be in LTE. Nevertheless, at daytime, the effects of non-LTE in the population of the CH4 vibrational populations are significant as a consequence of solar direct excitation by absorption at 3.3-mm. The effects derived from the uncertainties on the parameters of the models will be presented.
Martin-Torres Francisco J.
Mlynczak Martin G.
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