Séminaire de Kostas Moraitis: “Computation, visualization, and applications of relative magnetic helicity in the Sun”

Jeudi 25 Avril à 15h, le pôle de physique solaire du LESIA acceuillera Kostas Moraitis, post-doctorant au LESIA dans le cadre du projet HéliSol, et qui quittera prochainement le projet.

Orateur:  Kostas Moraitis (LESIA)

Titre: “Computation, visualization, and applications of relative magnetic helicity in the Sun”

Date: Jeudi 25 Avril à 15h
Lieu: Salle de réunion du bâtiment 14, Observatoire de Paris, Site de Meudon

Abstract: This talk summarizes three recent works regarding magnetic helicity, which is a measure of the geometrical complexity of a 3D magnetic field and a conserved quantity of ideal MHD. The first work is about an accurate method to compute relative magnetic helicity, the appropriate helicity for most natural plasmas, in spherical geometry, and especially in finite volumes. The second work deals with a method to visualize relative magnetic helicity through a density proxy called field line helicity. In the third work, after studying the evolution of relative magnetic helicity in a solar active region, we discuss the possibility of indicating AR eruptivity with helicity-related quantities.