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Accueil > Séminaires & Soutenances > Séminaires, soutenances de thèses et HDR précédents > 2021 > Séminaires 2021 > Thursday 1 July at 10h30

Thursday 1 July at 10h30

Etienne Pariat (LPP) : Magnetic helicity : conservation & marker of solar eruptivity

Magnetic helicity occupies a peculiar place in plasma physics : despite being one of the few invariant in ideal magneto-hydrodynamics (MHD), its actual estimation, in laboratory experiments, observations and even numerical domains, remains arduous. Magnetic helicity is a quantity that is tightly related with the level of entanglement of magnetic field lines in a plasma. Recent developments in the theory of its measurements have nonetheless allowed to open fresh investigation of its properties. They reveal that magnetic helicity could be a key element to understand a central problem of solar physics : the trigger of solar eruptions.


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CNRS Ecole Polytechnique Sorbonne Université Université Paris-Saclay Observatoire de Paris
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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 : Dominique Fontaine (Directrice)