July 27, 2015 to August 21, 2015
Nordita, Stockholm
Europe/Stockholm timezone

Magnetic null points in the three-dimensional kinetic simulations of space plasma

Aug 10, 2015, 4:35 PM
25m
FD5 (FD5)

FD5

FD5

Invited Workshop, August 10-14 Afternoon I

Speaker

Dr Vyacheslav Olshevsky (KU Leuven)

Description

Fully kinetic electromagnetic particle-in-cell code iPic3D is used to model magnetic reconnection in the variety of plasma configurations. We apply Poincare index technique to locate and identify the topological characteristics of the magnetic null points in different three- dimensional simulations. The relevance of magnetic nulls to energy dissipation, turbulence and plasma instabilities is studied in the scenarios of: turbulent dissipation of an unstable plasma configuration, Lunar Magnetic Anomalies, planetary mini-magnetospheres, symmetric and asymmetric 3D Harris sheet configurations. In particular, we found out that magnetic nulls of the spiral topological type associated with the magnetic islands and flux ropes play more important role in energy dissipation than the radial nulls. This finding is in accordance with recent MHD simulations and in situ observations of Cluster spacecraft.

Primary author

Dr Vyacheslav Olshevsky (KU Leuven)

Co-authors

Andrey Divin (St Petersburg State University) Mr Emanuele Cazzola (KU Leuven) Prof. Giovanni Lapenta (KU Leuven) Ms Ivy Bo Beng (KTH Royal Institute of Technology) Dr Jan Deca (University of Colorado in Boulder) Dr Jorge Amaya (KU Leuven) Dr Maria Elena Innocenti (KU Leuven) Dr Stefano Markidis (KTH Royal Institute of Technology)

Presentation materials