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Accueil > Séminaires et conférences > Séminaires, soutenances de thèses et HDR précédents > 2015 > Séminaires 2015 > Le jeudi 21 mai à 11h

Le jeudi 21 mai à 11h

Sergio Servidio (Department of Physics, University of Calabria, Cosenza, Italy)

Titre : Intermittent magnetic structures in plasmas : from MHD to Vlasov turbulence

Lieu : salle de l’ex LIX, aile 0, Palaiseau

Résumé :
A description of intermittent magnetic structures that spontaneously emerge in turbulence is presented. Systematic analysis of numerical simulations of two-dimensional magnetohydrodynamic (2D MHD) turbulence reveals the presence of a large number of X-type neutral points, where magnetic reconnection locally occurs. The associated reconnection rates are distributed over a wide range of values and scales, exhibiting a good agreement with
existing theories of magnetic reconnection. This scenario has been further inspected in the context of Hall MHD and Vlasov 2D simulations. In particular, the kinetic simulations suggest that these inhomogeneous magnetic structures may be the important sites of processes such as heating, temperature anisotropy, and particle acceleration processes - phenomena commonly described in homogeneous conditions. This new perspective on reconnection is relevant to space and astrophysical contexts, where plasma is generally in a fully turbulent regime.


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Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Pascal Chabert (Directeur)