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Contribution à l'étude des entrées d'énergie solaire dans l'ionosphère : Ions doublement chargés et transport cinétique des protons - Application à la Terre et à Titan

Abstract : This PhD project consists in the modelling of planetary ionospheres such as those of the Earth and Titan through high-energy transport processes occurring on the dayside and on the nightside at auroral latitudes. The modelling of the doubly-charged ions N2++, O2++ and O++ created through photoionisation constitutes the first step of this work. The results are compared to the few atmospheric O++ data available on Earth, for which a very good agreement has been found, leading to the first prediction of molecular dications in the Earth's and Titan's ionospheres. In a second step, as a dynamical coupling and an updating of different kinetic codes, a consistent kinetic/fluid proto-electron numerical model called TRANS4 has been built, which makes it a unique tool to get a precise diagnostics of combined proton and electron impacts in the ionosphere. Perspectives are numerous, and one privileged track is to port the whole model to other planetary atmospheres, such as Mars, Venus or Titan, a will that coincides with the exciting success of Mars Express, Venus Express and Cassini-Huygens planetary missions. A fruitful collaboration with the Physico-Chemistry Laboratory (LCP, Orsay, France) as well as with the University of Oslo and the University Centre in Svalbard (UNIS, Norway) was successfully led throughout the building of this work.
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https://tel.archives-ouvertes.fr/tel-00109802
Contributor : Cyril Simon <>
Submitted on : Wednesday, October 25, 2006 - 4:09:27 PM
Last modification on : Friday, November 6, 2020 - 4:15:36 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 6:41:47 PM

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  • HAL Id : tel-00109802, version 1

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Cyril Simon. Contribution à l'étude des entrées d'énergie solaire dans l'ionosphère : Ions doublement chargés et transport cinétique des protons - Application à la Terre et à Titan. Astrophysique [astro-ph]. Université Joseph-Fourier - Grenoble I, 2006. Français. ⟨tel-00109802⟩

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