Evolution of Titan's atmospheric aerosols under high-altitude ultraviolet irradiation

Abstract : Titan is the biggest satellite of Saturn whose atmosphere is mainly composed of molecular nitrogen (N2) and methane (CH4) with an average ratio of 98/2 %. The Cassini/Huygens mission revealed that the interaction between those neutral molecules and the UV solar light leads to a complex photochemistry that produces heavy organic molecules. When those molecules condense, they will then become the solid aerosols which are responsible for the brownish haze surrounding Titan. Between 1000 and 600km, the VUV solar radiations are still significant and will continue to modify the physical, chemical and optical properties of those grains. A change in these parameters can impact the radiative budget of Titan’s atmosphere.
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Sarah Tigrine, Nathalie Carrasco, Ahmed Mahjoub, Benjamin Fleury, Guy Cernogora, et al.. Evolution of Titan's atmospheric aerosols under high-altitude ultraviolet irradiation . European Planetary Science Congress 2015, Sep 2015, Nantes, France. ⟨hal-01308021⟩

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