Titan Haze And Cloud Layers Constrained By Photometry.

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We have used several images made by VIMS onboard Cassini to study the haze and cloud layers. In our work, we focused both on the haze and the cloud layer in northern hemisphere (above 40°N). These two regions of Titan are probably the most interesting to understand the source and the sink of the haze and consensible species. Using a radiative transfer model we found several results that constrain the cloud layers :
We characterized the spatial distribution of the haze layer above about 100 km, and the mist (mixture of haze and condensate below about 70 km) in the low stratosphere and the troposphere.
Beyond 62°N, we can see the influence of the north polar cloud in the centre and in the sides of several methane windows. The structure of the cloud and its time evolution (studied elsewhere by Lemouélic et al., 2010) depends on the atmosph:ere circulation. Here we focus on the best image that we have (T22). Using a radiative transfer model, we retrieved the altitude and the opacity of the cloud at each pixel. We made a map of the polar cloud (altitude and opacity) and we found that the north polar cloud has two levels which probably corresponds to two different condensible species.

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