Other
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1158g&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1158
Other
Scientific paper
This paper summarizes the work presented in [1]. In that work, we fulfilled a thorough analysis of Titan's methane limb emission at 3.3 μm measured by VIMS in Titan. Methane is, after nitrogen, the most abundant species in Titan's atmosphere. It plays an important role in its chemistry and energy budget and strongly emits during daytime around 3.3 μm. In Titan's upper atmosphere, where pressure is low, that emission is affected by non-local thermodynamic equilibrium. Therefore, its analysis needs from a modeling of the population of the emitting levels considering specifically the mechanisms able to excite and de-excite them. We developed a sophisticated non-LTE model that includes all known excitation mechanisms and calculates the population of 22 CH4 vibrational levels from two isotopes. We simulated VIMS radiance and identified the bands that significantly contribute to the total measured signal. We also retrieved daytime methane abundance from 500 to 1100 km and compared our results with other measurements and results from models.
Adriani Alberto
Coradini Angioletta
Funke Bernd
Garcia-Comas Maya
Lopez-Puertas Manuel
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