Modélisation du phénomène de diffusion radiale au sein des ceintures de radiation terrestres par technique de changement d’échelle

Abstract : This study falls within the field of the Earth’s radiation belt dynamics. It consists of modeling the radial diffusion process based on a spatiotemporal resolution higher than the resolution at which radiation belt dynamics are described in terms of a diffusion equation. The approach has been organized in three parts. First, we described radial diffusion theoretically, highlighting the main drivers of the phenomenon and giving a ready-made formula of the radial diffusion coefficients. Then, based on this formula, we aimed to quantify the radial diffusion coefficients. In order to reach this goal, we developed analytical and numerical procedures, and then, observational procedures. Finally, we discussed the results and the pros and cons of each method. This study highlights the central role of asymmetric variations of the electromagnetic fields and induced electric fields in the driving of the intensity of the radial diffusion process. It provides tracks for numerical and experimental quantification of these two drivers. It also provides tools for a critical review of the literature. It paves the way for a more accurate determination of radial diffusion coefficients based on a more precise description of the electromagnetic environment and its variations.
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S. Lejosne. Modélisation du phénomène de diffusion radiale au sein des ceintures de radiation terrestres par technique de changement d’échelle. Physique de l'espace [physics.space-ph]. Université de Toulouse, 2013. Français. ⟨tel-01132913⟩

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