München 2019 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 9: Poster

EP 9.22: Poster

Donnerstag, 21. März 2019, 16:30–19:00, Durchgangshalle

Investigation of topology-driven magnetic reconnection with CWENO finite volume numerics — •Raquel Mäusle1, Jean-Mathieu Teissier2, and Wolf-Christian Müller21Freie Universität Berlin, Berlin, Germany — 2Technische Universität Berlin, Berlin, Germany

Magnetic reconnection is a process that changes the magnetic field topology due to finite electrical resistivity in the field's plasma environment. A possible trigger for the onset of reconnection is a high entanglement of the field lines which can exponentially amplify the influence of small resistive effects [Boozer 2012].

This type of topology-driven reconnection is investigated by finite-volume numerics in order to verify the proposed theory. The plasma is described by the ideal magnetohydrodynamic (MHD) equations, in which resistivity is neglected.

A simple numerical setup is used to study this mechanism with 3D simulations, in which the initially constant magnetic field is driven to high entanglement. A fast transition from a stationary state to a chaotic state is observed, which is characterized by locally enhanced current densities, large separations of neighboring field lines and a change in the mapping of foot points. The consequences of these observations and their relation to reconnection dynamics are discussed.

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