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Evolution of the magnetic field generated by the Kelvin-Helmholtz instability
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
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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
2014. Vol. 21, no 7, 072126- p.
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:kth:diva-153286DOI: 10.1063/1.4891340ISI: 000341154100028ScopusID: 2-s2.0-84905457068OAI: diva2:752644

QC 20141006

Available from: 2014-10-06 Created: 2014-10-03 Last updated: 2014-10-06Bibliographically approved

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Modestov, MikhailBrandenburg, Axel
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Nordic Institute for Theoretical Physics NORDITA
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