Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....2941l&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #2941
Physics
Scientific paper
We will report on recent efforts to characterize the zonal wind flow in Titan's stratosphere. We have used the UVES echelle spectrometer mounted at VLT-UT2 to obtain high-resolution solar spectra reflected off Titan. The purpose of the observations, which were done in February 2002, has been to detect the differential Doppler shift induced by the zonal wind flow in the back-scattered solar radiation from the East and West limbs of Titan. Since the wind speed should not exceed 200 m/s, an absolute detection of the shift on single solar lines is not feasible due to the limited spectral resolution of UVES. This is why we apply a retrieval scheme developed for stellar accelerometry (Connes P. 1985, ApSS 110, 211; Martyc M. et al. 1999, A&A 351, 993) which makes use of the full spectral range (˜ 4200 to 6200 Angstroms for the red arm of the instrument) and takes into account all the lines present in the spectrum. Preliminary results indicate that the wind is prograde.
Appourchaux Thierry
Courtin Regis
Ferri Fabio
Gautier Daniel
Hourdin Fréderic
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