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Modélisation des ceintures de radiations de Saturne

Abstract : Radiation belts cause irreversible damages to on-board instrument materials. Studies about radiation belts can be useful for development of materials that will stand such environment. Since the 1990's, ONERA develops models of radiation belts of magnetized planets, such as the Earth or Jupiter. These previous work lead to a physical model, named Salammbô. Salammbô is based on physical processes that dominate the planetary magnetosphere in order to recreate electron populations of radiation belts. ONERA is now able to develop an electron radiation belt model for Saturn's environment, i.e., a new version of Salammbô. Before the 2000's, Pioneer 11 and Voyager 2 did not allow a good development of a Salammbô model in the case of Saturn. Nowadays, the Cassini mission gives a lot of information about Saturn, its magnetosphere and its environment to start a study about radiation belts of Saturn. This thesis begins with the analyze of the kronian magnetosphere: rings, satellites, neutral cloud, etc. Interaction between radiation belt particle and these different parameters lead to diffusion coefficients. Diffusion coefficients are integrated into the Salammbô code and imply a better comprehension of mechanisms that can interfere with the electron distribution of radiation belts. Results have been compared with observations of Pioneer 11, Voyager 2 and Cassini spacecrafts.
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https://theses.hal.science/tel-00750170
Contributor : Lise Lorenzato Connect in order to contact the contributor
Submitted on : Friday, November 9, 2012 - 10:29:39 AM
Last modification on : Tuesday, March 16, 2021 - 3:44:16 PM
Long-term archiving on: : Sunday, February 10, 2013 - 3:40:34 AM

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  • HAL Id : tel-00750170, version 1

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Lise Lorenzato. Modélisation des ceintures de radiations de Saturne. Autre. Université de Toulouse, 2012. Français. ⟨NNT : ⟩. ⟨tel-00750170⟩

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