아래와 같이 세미나를 진행하오니
관심있는 분들의 많은 참여를 바랍니다.
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● 날짜 : 2015년 5월 19일 (화요일)
● 시간 : 16시 30분
● 장소 : 천문대 영상실
● 강사 : Dr. Regis Courtin, Observatoire de Paris, Meudon, France
Title : Evolution of H2 on Titan from the Cassini CIRS investigation
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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