Étude des effets des entrées énergétiques dans les atmosphères de Vénus, Mars et Titan

Abstract : Aeronomy is a multi disciplinary field with the aim of studying the relationship between the Earth or other planet atmospheres and the particles precipitation from space.
Aeronomy was primarly the study of the Earth atmosphere, and its relations with the solar wind. In this thesis, I extended the standard aeronomy researches to higher energy and to other planets.
In a first part, I modified the Trans* codes to study the doubly charged ions, in the upper atmosphere of Venus. In that frame, I used the highest energies of the standard studies of planetary ionospheres. That work also permitted to improve studies on the Venusian (and Martian) ionosphere-thermosphere emissions, and raised the issue of the mechanism leading to the green line in CO2-rich atmospheres.
In a second part, I studied the precipitation of electrons along magnetic field lines embedded in the atmosphere of Titan. Giving a new approach on particle precipitation in the mesosphere of this saturnian satellite.
In a third part, I used the Planetocosmic code to implement the computation of cosmic ray impact in the Titan atmosphere. Moreover, a proton precipitation code was added to that code to compute the whole ion production in the atmosphere (from electron and photon productions in the upper atmosphere to the lower atmosphere with the cosmic rays). Those productions were used as an input for chemical models to understand the whole chemical-physical processes in Titan.
The theoretical work performed in this thesis has been successfully compared to space missions Mars Express, Venus Express and Cassini-Huygens.
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https://tel.archives-ouvertes.fr/tel-00400638
Contributor : Guillaume Gronoff <>
Submitted on : Wednesday, July 1, 2009 - 12:15:24 PM
Last modification on : Friday, April 5, 2019 - 8:05:14 PM
Long-term archiving on : Monday, October 15, 2012 - 3:00:18 PM

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Guillaume Gronoff. Étude des effets des entrées énergétiques dans les atmosphères de Vénus, Mars et Titan. Astrophysique [astro-ph]. Université Joseph-Fourier - Grenoble I, 2009. Français. ⟨tel-00400638⟩

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