Properties and distribution of the aerosols in the atmosphere of Titan

Physics

Scientific paper

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Aerosols, Density Distribution, Satellite Atmospheres, Size Distribution, Titan, Atmospheric Models, Cloud Physics, Hydrocarbons, Light Scattering

Scientific paper

A description of a time dependent model which shows the distribution of size and density of the aerosols in the atmosphere of Titan is given. The distribution of size (0.1 to 10 micrometers) is computed including classical microphysical processes in clouds: sedimentation, diffusion, coagulation, and coalescence. The Titan's time required to reach equilibrium is on the order of 108 s. At lower altitudes, condensation of hydrocarbons leads to a rapid increase of the aerosol size. In particular, as a structure of aerosols is stratified, a simple treatment with the theory of Mie is unworkable. More accurate treatment is presented where diffusion of light by stratified particles of hydrocarbons is computed. Comparison is given for spherical aerosol with two layers: a core of tholin and a mantel of C2H6. The calculation shows that the more important effect is due to the presence of the mantel creating a considerable reflection at the interface between the two layers.

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