Characterization of zonal winds in the stratosphere of Titan with UVES

Details Characterization of zonal winds in the stratosphere of Titan with UVES Characterization of zonal winds in the stratosphere of Titan with UVES

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005icar..179..497l&link_type=abstract

Icarus, Volume 179, Issue 2, p. 497-510.

Astronomy and Astrophysics

Astrophysics

14

Scientific paper

Titan has been observed with UVES, the UV Visual Echelle Spectrograph at the Very Large Telescope, with the aim of characterizing the zonal wind flow. We use a retrieval scheme originally developed for absolute stellar accelerometry [Connes, P., 1985. Astrophys. Space Sci., 110, 211 255] to extract the velocity signal by simultaneously taking into account all the lines present in the spectrum. The method allows to measure the Doppler shift induced at a given point by the zonal wind flow, with high precision. The short-wavelength channel (4200 5200 Å) probes one scale height higher than the long-wavelength one (5200 6200 Å), and we observe statistically significant evidence for stronger winds at higher altitudes. The results show a high dispersion. Globally, we detect prograde zonal winds, with lower limits of 62 and 50 m s-1 at the regions centered at 200 and 170 km altitude, but approximately a quarter of the measurements indicates null or retrograde winds.

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