An unidentified emission in Titan's upper atmosphere

Details An unidentified emission in Titan's upper atmosphere An unidentified emission in Titan's upper atmosphere

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p33e1803d&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P33E-1803

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[6281] Planetary Sciences: Solar System Objects / Titan

Scientific paper

Saturn's moon Titan possesses a substantial atmosphere, made mainly of nitrogen and methane, that extends higher than 1000 km above its surface. The part of atmosphere between 400 km and 950 km has been called 'Agnostosphere' since it cannot be sampled directly by Cassini (the lowest flyby is 950 km) and it is difficult to be studied with remotesensing instrument due to its low density. Observations of Titan atmosphere made with the instrument VIMS on board the Cassini satellite in October 26th, 2004 show in the spectral region around 3.0 μm a strong limb emission at high atmospheric altitudes (above 500 km) with the spectral signatures of CH4 and HCN. Other VIMS observations also exhibit the same features. A detailed analysis of the methane spectral region showed a residual emission that peaks at about 900 km centered at 3.28 μm that could not be assigned to any known CH4 bands. We report on the analysis carried out for assigning this emission and propose a possible candidate

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