Longitudinal
dunes, up to 330 ft (100 m) high
[122] about a kilometer wide, and tens to hundreds of kilometers long straddle Titan's equator. these were formed by Titans, steady
zonal (eastward) winds combine with variable tidal winds. Tidal winds are those caused by Saturn’s gravitational tidal influence which is 400 times stronger than the tidal forces of the Moon on Earth and tend to drive wind toward the equator.
This wind pattern, it was theorized, causes granular material on the surface to gradually build up in long parallel dunes aligned west-to-east.
Recent computer simulations indicate that the dunes might qalso be the result of rare storm winds that happen only every fifteen years when Titan is in
equinox. These storms produce strong downdrafts, flowing eastward at up to 10 meters per second approx 30 feet per second when they reach the surface. Calculations indicate the sand on Titan has a density of one-third that of terrestrial sand and is very likely not composed if silicate material as Earth’s sand dunes are.
Titan (moon) - Wikipedia
Sand dunes in the
Namib Desert on Earth (top), compared with dunes in Belet on Titan
By NASA/JSC - uppper photo; NASA/JPL - lower photo - File:Titan dunes.jpg, Public Domain,
File:Titan dunes crop.png - Wikimedia Commons