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

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Scientific paper

We report on the monitoring of cloud activity in Titan's atmosphere during a period which includes the equinox. Clouds have been observed by 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. 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 mid-latitudes are still present although the activity in this area seems to decrease. Such observations are compared with predictions of Global Circulation Models (GCMs) in order to better constrain such models and to better understand the processes which drive Titan's weather.

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