PAILLOU, Philippe; MITCHELL, K. L.; WALL, Stephen D.; RUFFIÉ, Gilles; WOOD, C.; LORENZ, R. D.; STOFAN, Ellen R.; LUNINE, J.I.; LOPES, R.; ENCRENAZ, P.

doi:10.1029/2007GL032515

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PAILLOU, Philippe
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

MITCHELL, K. L.
Jet Propulsion Laboratory [JPL]

WALL, Stephen D.
Jet Propulsion Laboratory [JPL]

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Geophysical Research Letters. 2008 n° 35, p. L05202

American Geophysical Union

Résumé en anglais

Cassini RADAR reveals the surface of Titan since flyby Ta acquired on October 2004. The RADAR instrument discovered volcanic structures, craters, dunes, channels, lakes and seas. In particular, flyby T16 realized in July 2006 imaged tens of radar-dark features close to Titan's north pole. They are interpreted as lakes filled with liquid hydrocarbons - mainly methane, a key material in the geologic and climatic history of Titan. In order to perform quantitative analysis and modeling of the radar response of Titan's lakes, the dielectric constant of liquid hydrocarbons is a crucial parameter, in particular to estimate the radar wave attenuation. We present here first measurements of the dielectric constant of LNG (Liquefied Natural Gas), mainly composed of methane, at Ku-band (10-13 GHz): we obtained a value = 1.75 - 0.002j. This value is used to model the radar backscattering of lakes observed during T16 flyby. Using a two-layer scattering model, we derive a relationship that is used to estimate a minimum depth for Titan's lakes. The proposed relationship is also coherent with the observation that the larger and then the deeper lakes are also the darker in radar images.< Réduire

Mots clés en espagnol

Titan

lakes

dielectric constant

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Microwave dielectric constant of liquid hydrocarbons: Application to the depth estimation of Titan's lakes

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