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Evolution of the magnetic field generated by the Kelvin-Helmholtz instability
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics. Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden.
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2014 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 21, no 7, 072126- p.Article in journal (Refereed) Published
Abstract [en]

The Kelvin-Helmholtz instability in an ionized plasma is studied with a focus on the magnetic field generation via the Biermann battery (baroclinic) mechanism. The problem is solved by using direct numerical simulations of two counter-directed flows in 2D geometry. The simulations demonstrate the formation of eddies and their further interaction and merging resulting in a large single vortex. In contrast to general belief, it is found that the instability generated magnetic field may exhibit significantly different structures from the vorticity field, despite the mathematically identical equations controlling the magnetic field and vorticity evolution. At later stages of the nonlinear instability development, the magnetic field may keep growing even after the hydrodynamic vortex strength has reached its maximum and started decaying due to dissipation.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2014. Vol. 21, no 7, 072126- p.
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-94168DOI: 10.1063/1.4891340ISI: 000341154100028OAI: oai:DiVA.org:umu-94168DiVA: diva2:752692
Available from: 2014-10-06 Created: 2014-10-06 Last updated: 2017-12-05Bibliographically approved

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Bychkov, VitalyBrodin, GertMarklund, Mattias
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