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Étude de l'Interaction du Vent Solaire avec Mars: Implications sur les Mécanismes d' Échappement Atmosphérique

Abstract : We analyze the solar wind interaction with Mars from Mars Global Surveyor (MGS) Magnetometer / Electron Spectrometer (MAG/ER) data in order to deduce constraints on non-thermal atmospheric escape mechanisms related to this interaction. We analyze high-amplitude highly coherent waves at the local proton cyclotron frequency never reported before. A theoretical study based on linear wave growth theory reveals that these waves are associated to the exospheric H+ pickup process. However, the characteristics of these waves and MHD Hall multi-fluid simulations suggest that nonlinear effects are involved in their origin. Theoretical studies are needed in order to establish constraints on exospheric model parameters and on the atmospheric loss rate from the properties of these waves. We also characterize the magnetic pileup boundary (MPB), a permanent plasma boundary located between the bow shock and the ionosphere. From a study of the magnetic field topology we demonstrate that the magnetic field line draping is strongly accelerated across the MPB. Equivalently, we demonstrate for the first time the existence of a MPB at Venus. Thus, the MPB is revealed to be a common boundary to all weakly magnetized, atmospheric bodies whose nature is deeply related to the multi-ion nature of their interaction.
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https://tel.archives-ouvertes.fr/tel-00010454
Contributor : César Bertucci <>
Submitted on : Thursday, October 6, 2005 - 5:19:54 PM
Last modification on : Monday, April 5, 2021 - 2:26:07 PM
Long-term archiving on: : Wednesday, March 29, 2017 - 12:00:18 PM

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César Bertucci. Étude de l'Interaction du Vent Solaire avec Mars: Implications sur les Mécanismes d' Échappement Atmosphérique. Astrophysique [astro-ph]. Université Paul Sabatier - Toulouse III, 2003. Français. ⟨tel-00010454⟩

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