Following cloud activity in Titan's atmosphere around the equinox with VIMS/Cassini

Details Following cloud activity in Titan's atmosphere around the equinox with VIMS/Cassini Following cloud activity in Titan's atmosphere around the equinox with VIMS/Cassini

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p31c1542r&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P31C-1542

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[5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [5445] Planetary Sciences: Solid Surface Planets / Meteorology, [6281] Planetary Sciences: Solar System Objects / Titan

Scientific paper

We report on the monitoring of cloud activity in Titan’s atmosphere during a period from 2004 to 2010, which includes the equinox, using the Visual and Infrared Mapping Spectrometer (VIMS) onboard the Cassini spacecraft. A semi-automated method is used to detect cloud events in every VIMS cube acquired since July 2004 and up to April 2010. Statistics are drawn on the location of the clouds and their evolution. It is shown that the cloud activity has recently decreased at the northern pole. The first clouds at northern mid-latitudes were detected a few terrestrial months after the Titan’s equinox. Few clouds have been detected in the equatorial area. Clouds at southern latitudes are still present although the activity in this area seems to decrease, especially around the south pole. All of these observations are important first harbingers of a new global circulation paradigm as Titan enters northern spring. Compared with predictions of Global Circulation Models (GCMs), these will allow to better constrain such models and to better understand the processes which drive Titan’s weather. Mean fractional cloud coverage in Titan’s atmosphere between July 2004 and April 2010.

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