The Sand Seas of Titan: Cassini RADAR Observations of Longitudinal Dunes

Details The Sand Seas of Titan: Cassini RADAR Observations of Longitudinal Dunes The Sand Seas of Titan: Cassini RADAR Observations of Longitudinal Dunes

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sci...312..724l&link_type=abstract

Science, Volume 312, Issue 5774, pp. 724-727 (2006).

Mathematics

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112

Scientific paper

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 ~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 ~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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