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[경희대] Evolution of H2 on Titan from the Cassini CIRS investigation

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일시 2015-05-19
장소 Auditorium, Kyung Hee Astronomical Observatory.
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Abstract TItle _ Evolution of H2 on Titan from the Cassini CIRS investigation

Speaker _ Dr. Regis Courtin

Date _ May 19th (TUE), 4:30 PM

Place _ Auditorium, Kyung Hee Astronomical Observatory.

Abstract

Far-infrared Titan spectra obtained with the Composite Infra-Red Spectrometer on the Cassini spacecraft have been analyzed to study the latitude distribution of H2 in the troposphere, as well as its temporal evolution over the period from March 2007 to August 2014. This analysis shows that the previously observed distribution, characterized by a 30%-70% enhancement at high Northern latitudes, has become more symmetrical since Equinox. Hence, the reversed pole-to-pole Hadley cell circulation established shortly after Equinox has been effective in equilibrating the H2 mole fraction in both polar regions, although not effective enough to produce a reversal of the polar enhancements probably because of a long time constant for the transport of air masses from the stratosphere to the troposhere.
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