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Home > Seminars & Defenses > Past seminars, PhD & HDR defenses > 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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