Modélisation à grande échelle pour les phénomènes éruptifs

Abstract : The object of this thesis is the modelisation of the magnetic field of the solar corona using the non linear reconstruction code XTRAPOLS, with a special emphasis on eruptive phenomena environments.The innovative nature of the studies we undertook is the spherical global aspect of the method.Three main works are presented in this dissertation. The first one is about the February 2011 geoeffective events, featuring a large active region. We highlight several twisted flux ropes structures,and characterize their relationship with large scale structures.The second work is about the events of August 3rd and 4th. Several active region are present on the disk,and two of them feature a high eruptive activity. Here again, we find twisted flux ropes in each of the active regions, and we highlight the topological relationship between them.The third is a study performed in the context of an NLFFF group, in order to study the non linear modeling of the global corona. The reconstruction is performed at a date corresponding to the total solar eclipse of march 20th 2015. We discuss the impact of the different types of data and models used, and emphasize on the importance of data temporal coherence and of taking into account coronal currents.Thus, the works presented in this dissertation allowed to characterize the global environment of eruptive active regions, to study the relationship between features at different scales. To go further, we present different methods for extending the model beyond the source surface.
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Pierre Chopin. Modélisation à grande échelle pour les phénomènes éruptifs. Astrophysique stellaire et solaire [astro-ph.SR]. Université Paris-Saclay, 2017. Français. ⟨NNT : 2017SACLX063⟩. ⟨tel-01774463⟩

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