Le jeudi 28 septembre 2023, Maïté DUMONT présentera l'examen en vue de l’obtention du grade académique de Docteur en Sciences (Collège de doctorat en sciences spatiales) sous la direction de Denis GRODENT.

Cette épreuve consistera en la défense publique d’une dissertation intitulée :

« Ultraviolet auroral emissions associated with plasma injections in Jupiter's magnetosphere ».

Abstract

This thesis focuses on the auroral signatures of plasma injections in Jupiter's ultraviolet (UV) emissions. We are mainly interested in low latitude auroral structures sharing the same characteristics as the particular Jovian auroral feature first interpreted by Mauk et al. (2002) as the signature of an injection of hot plasma in the magnetosphere. The characteristics of UV auroral structures in the outer emissions were studied using data from Hubble Space Telescope (HST) and the Juno spacecraft. The characteristics of these structures in the ionosphere and magnetosphere have been analysed. The motion of the auroral signatures of plasma injections present in HST data was examined and the characteristics of the structures were then compared with simulations of auroral precipitation based on pitch angle scattering. This work sheds light on the magnetospheric and ionospheric processes that may be involved in plasma injections and their auroral signatures in Jupiter's magnetosphere.

Le Jury sera composé de :

M. M. DE BECKER (Président), Mme et MM. B. BONFOND (Secrétaire), J.C. GERARD, D. GRODENT (Promoteur), V. HUE (Aix-Marseille Université), V. PIERRARD (Institut Royal d’Aéronomie Spatiale de Belgique).