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Modélisation de la dynamique couplée des plasmas magnétosphérique et ionosphérique.

Abstract : The interaction of the solar wind with the terrestrial magnetic field induces in the magnetosphere an electric field responsible of the motion (or convection) of the plasma from the tail to the Earth. The magnetospheric particles interact with the ionosphere, the ionized part of the Earth's atmosphere. They modify the electrical properties of the ionospheric conductor, particularly the electric field distribution which moves the magnetospheric plasma. The Centre d'Etude Spatiale des Rayonnements built a numerical model describing self-consistently the magnetospheric convection coupled with the ionosphere. We modified this code in order :
1) to include the effects of the asymmetry between the two north and south hemispheres due to the solar illumination
2) to replace the used dipolar magnetic field model by a more realistic model The first numerical results show the large effect of the inter-hemispheric asymmetry on the ionospheric plasma dynamics but that the magnetosphere is relatively insensitive to these effects. They also show that the use of a magnetic field topology more realistic than the one of a dipole is necessary to reproduce the observations
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Submitted on : Thursday, March 6, 2008 - 3:37:07 PM
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  • HAL Id : tel-00261300, version 1



Yannis Hurtaud.. Modélisation de la dynamique couplée des plasmas magnétosphérique et ionosphérique.. Astrophysique [astro-ph]. Université Paul Sabatier - Toulouse III, 2007. Français. ⟨tel-00261300⟩



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