Temporal changes in Titan's equatorial wind from ground-based and CIRS measurements

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Scientific paper

The Cassini Huygens mission provides a unique opportunity to combine ground-based and spacecraft investigations to increase our understanding of chemical and dynamical processes in Titan's atmosphere and to obtain information on temporal variability. Spectroscopic measurements from both vantage points enable the retrieval of global wind structure, temperature structure, and atmospheric composition. An updated analysis of Titan data obtained near the equatorial region by the NASA Goddard Space Flight Center's Infrared Heterodyne Spectrometer (IRHS) and Heterodyne Instrument for Planetary Wind and Composition (HIPWAC) prior to and during the Cassini Huygens mission is compared to retrievals from the Cassini Composite Infrared Spectrometer (CIRS) measurements. IRHS/HIPWAC results, including the first direct stratospheric wind measurements on Titan, are combined with other direct techniques, stellar occultation measurements, and CIRS results, to explore seasonal variability over nearly one Titan year and to provide an empirical altitude profile of stratospheric winds, varying from ~50 to 210 m/s prograde.

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