期刊
PLANETARY AND SPACE SCIENCE
卷 58, 期 5, 页码 792-800出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2009.12.005
关键词
Titan; Atmospheres; Composition; Dynamics
资金
- UK Science and Technology Facilities Council
- NASA
- STFC [ST/F007957/1, ST/F007957/2] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F007957/2, ST/F007957/1] Funding Source: researchfish
Five years of Cassini CIRS infrared spectra have been used to determine the tilt of Titan's stratospheric symmetry axis with respect to the solid body rotation axis. Measurements of HCN abundance centred around 5 mbar (125 km altitude) at equatorial latitudes show the symmetry axis is tilted by 4.0 +/- 1.5 degrees in a direction 70 +/- 40 degrees W of the sub-solar point. This value is consistent with tilts determined from temperature and haze measurements by Achterberg et al. (2008a) and Roman et al. (2009). The consistency of results from three independent methods suggests that Titan's entire stratosphere is tilted and provides a powerful constraint on the underlying atmospheric dynamics. (c) 2010 Elsevier Ltd. All rights reserved.
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