The sand seas of Titan: Cassini RADAR observations of longitudinal dunes.


The most recent Cassini RADAR images of Titan show widespread regions (up to 1500 kilometers by 200 kilometers) of near-parallel radar-dark linear features that appear to be seas of longitudinal dunes similar to those seen in the Namib desert on Earth. The Ku-band (2.17-centimeter wavelength) images show approximately 100-meter ridges consistent with duneforms and reveal flow interactions with underlying hills. The distribution and orientation of the dunes support a model of fluctuating surface winds of approximately 0.5 meter per second resulting from the combination of an eastward flow with a variable tidal wind. The existence of dunes also requires geological processes that create sand-sized (100- to 300-micrometer) particulates and a lack of persistent equatorial surface liquids to act as sand traps.

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@article{Lorenz2006TheSS, title={The sand seas of Titan: Cassini RADAR observations of longitudinal dunes.}, author={Ralph Lorenz and Stephen J Wall and Jani Radebaugh and G. Boubin and E Reffet and M Janssen and Ellen R. Stofan and Rosaly M. C. Lopes and Randolph L. Kirk and Charles Elachi and Jonathan I. Lunine and Karl Mitchell and F. Paganelli and Larry A. Soderblom and Christopher R. Wood and Lesley Wye and Howard A. Zebker and Y S Anderson and Steve Ostro and Marvin J. Allison and Rudy Boehmer and P . X . Callahan and Pierre J. Encrenaz and G. G. Ori and G Francescetti and Yonggyu Gim and Garry Hamilton and Scott E Hensley and William T. K. Johnson and Kimberly Kelleher and Donn Muhleman and Giovanni Picardi and Francesco Posa and Lorenz Roth and Roberto Seu and Stephen Shaffer and Brad Stiles and Sergio Vetrella and Enrico Flamini and Robert West}, journal={Science}, year={2006}, volume={312 5774}, pages={724-7} }