Interferometric measurements of zonal winds on Titan

Details Interferometric measurements of zonal winds on Titan Interferometric measurements of zonal winds on Titan

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...437..319m&link_type=abstract

Astronomy and Astrophysics, Volume 437, Issue 1, July I 2005, pp.319-328

Astronomy and Astrophysics

Astrophysics

25

Planets And Satellites: Individual: Titan, Techniques: Interferometric, Radio Lines: Solar System

Scientific paper

We report millimetre observations of Titan performed with the IRAM Plateau de Bure Interferometer at the rotational frequencies of HC3N(25-24) and CH3CN(12-11). The most extended configuration of the array yielded disk-resolved emission spectra of Titan with an angular resolution of 0.6''. Data were acquired in February-March 2003 and February 2004 near the greatest eastern and western elongations of Titan at high spectral resolution (λ/Δλ = 5.5 × 106). Doppler lineshift measurements enable us to establish that the zonal wind flow is prograde in the upper atmosphere. Two different altitude regions are probed. Beam-integrated equatorial wind velocities of 160 (± 60) m/s and 60 (± 20) m/s are determined at respective altitudes of 300 (± 150) km (upper stratosphere) and 450 (± 100) km (lower mesosphere). The latter is the first direct determination of mesospheric wind speed on Titan.

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