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            <title xml:lang="en">Study of the interaction between the Titan exosphere and the kronian magnetosphere, with the use of the data from the MIMI (Magnetosphere Imaging Instrument) experiment onboard Cassini</title>
            <title xml:lang="fr">Etude de l'interaction entre l'exosphère de Titan et la magnétosphère kronienne, à l'aide des données de l'expérience MIMI (Magnetosphere Imaging Instrument) à bord de Cassini</title>
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            <idno type="stamp" n="UNIV-UT3">Université Toulouse 3</idno>
            <idno type="stamp" n="UT3-INP">Université de Toulouse / Toulouse INP</idno>
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                <title xml:lang="en">Study of the interaction between the Titan exosphere and the kronian magnetosphere, with the use of the data from the MIMI (Magnetosphere Imaging Instrument) experiment onboard Cassini</title>
                <title xml:lang="fr">Etude de l'interaction entre l'exosphère de Titan et la magnétosphère kronienne, à l'aide des données de l'expérience MIMI (Magnetosphere Imaging Instrument) à bord de Cassini</title>
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                <authority type="institution">Université Paul Sabatier - Toulouse III</authority>
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                <term xml:lang="fr">Titan</term>
                <term xml:lang="fr">exosphère</term>
                <term xml:lang="fr">Cassini</term>
                <term xml:lang="fr">magnétosphère</term>
                <term xml:lang="fr">atomes énergétiques neutres</term>
                <term xml:lang="it">energetic neutral atoms</term>
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              <p>The largest satellite of Saturn, Titan, has a nitrogen-rich atmosphere directly bombarded by magnetospheric energetic ions, due to its lack of a significant intrinsic magnetic field. Charge-exchange collisions between the cold neutrals of its exosphere (the upper part of the atmosphere) and the energetic ions from Saturn's magnetosphere produce then energetic neutral atoms (ENAs). The Ion and Neutral Camera (INCA), one of the three sensors that comprise the Magnetosphere Imaging Instrument (MIMI) on the Cassini spacecraft orbiting around Saturn, images these neutrals like photons, measures their fluxes and provides a powerful diagnostic of the interaction between Titan and the kronian magnetosphere.&lt;br /&gt;Our work during this PhD thesis was first to model the Titan exosphere, with both thermal and non thermal profiles. An ENA flux calculation model was then developed, compared to observations and completed with a study of the ENA absorption mechanisms. We have also performed a statistical analysis of the MIMI data during the Titan flybys and orbit crossings. Finally, an application on the icy satellite Rhea allowed to infer upper limits for its eventual exosphere.</p>
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              <p>Le plus gros satellite de Saturne, Titan, voit son atmosphère dense en azote bombardée par les ions énergétiques de la magnétosphère, en raison de l'absence de champ magnétique intrinsèque significatif. Des réactions d'échange de charge entre les neutres froids de l'exosphère (plus haute région atmosphérique) et ces ions énergétiques créent alors des atomes énergétiques neutres (ENAs). L'instrument INCA (Ion and Neutral Camera), l'un des trois instruments de l'expérience MIMI (Magnetosphere Imaging Instrument) à bord de la sonde Cassini en orbite autour de Saturne, permet d'imager ces neutres comme des photons et de mesurer leur flux, et fournit ainsi un diagnostic précieux de l'interaction entre Titan et la magnétosphère kronienne.&lt;br /&gt;Notre travail de thèse a consisté, en premier lieu, à modéliser l'exosphère de Titan, en considérant à la fois des profils thermiques et non thermiques. Un modèle de calcul de flux d'ENAs a été, en second lieu, développé, comparé aux observations, et enrichi par une étude des processus d'absorption des ENAs. Nous avons ensuite réalisé une analyse statistique des données de l'expérience MIMI durant les traversées d'orbite et survols de Titan. Enfin, une application au satellite de glace Rhéa a permis de fournir des conditions limites pour l'existence de son éventuelle exosphère.</p>
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