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R. Moreno, A. Marten (LESIA, Obs. Paris)
On February 16th and 17th 2004, we observed Titan with the IRAM Plateau de Bure Interferometer. New spectral maps were obtained in the HC3N(25-24) and CH3CN(12-11) rotational lines at 227.4 GHz and 220.7 GHz, respectively. An angular resolution of 0.6 arcsec was obtained using the most extended configuration of the six-antenna array, permitting a disk-resolved investigation of the doppler lineshifts, characterizing the zonal wind flow in the upper atmosphere.
A clear prograde wind direction is determined at the altitude probed (250 and 400 km), through Doppler lineshifts measurements between the east and west. The retrieved zonal wind speeds and its comparison with 2003 results will be presented.
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Bulletin of the American Astronomical Society, 36 #4
© 2004. The American Astronomical Soceity.