Daily Evolution of Mid-Latitude Clouds on Titan

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Scientific paper

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Scientific paper

Mid-latitude clouds are observed with the SINFONI integral field spectrograph at the Very Large Telescope (VLT) over four consecutive nights (28 Jan 2007 through 31 Jan 2007 UT) during the Cassini T24 flyby. The initially unresolved clouds occur in the same location on the first two nights, increase dramatically in size on the third night, and are displaced on the final night of observation. Cassini/VIMS observations of the clouds during the flyby indicate that cells within the system of clouds are changing in altitude and spatial extent on hourly timescales. Such mid-latitude cloud activity, occurring over a few hours, was first reported by Griffith et. al, 2005, providing evidence for a convective cloud formation mechanism. If the convectively driven cloud system observed here is indeed associated with precipitation, then the long lifetime and greater than 1000 km spatial extent suggests that it may be similar to mesoscale convective systems on Earth. We discuss this and other speculations related to the formation and daily evolution of Titan's mid-latitude clouds.

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