Bonn 2020 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 11: Astrophysics I

EP 11.5: Hauptvortrag

Donnerstag, 2. April 2020, 17:30–18:00, H-HS VIII

Topology-driven magnetic reconnection — •Raquel Mäusle1, Jean-Mathieu Teissier1,2, and Wolf-Christian Müller1,2,31Technische Universität Berlin, Berlin, Germany — 2Berlin International Graduate School in Model and Simulation Based Research — 3Max-Planck/Princeton Center for Plasma Physics, Princeton, NJ, USA

Magnetic reconnection is a process that occurs in plasmas, during which the topology of the magnetic field is changed in the presence of finite electrical resistivity. It is observed in solar flares, the Earth’s magnetosphere as well as magnetic confinement devices.

We study a three-dimensional model of reconnection driven by magnetic field topology. In this framework, a high entanglement of magnetic field lines amplifies the influence of resistive effects and can thereby trigger reconnection. We investigate this model numerically using a finite-volume scheme to solve the magnetohydrodynamic (MHD) equations. This is done with a simple setup, in which an initially constant magnetic field is driven to high complexity. We study the dynamics of this system and observe a phase transition from a stationary to a chaotic state, which is potentially caused by the onset of reconnection. Furthermore, we find that the entanglement of field lines and the occurrence of reconnection events are temporally correlated.

In this talk I will introduce the model and numerical method employed and present our preliminary results.

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