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The contribution of kinetic helicity to turbulent magnetic diffusivity
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Colorado, USA.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Colorado, USA; University of the Negev, Israel.
Number of Authors: 3
2017 (English)In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 338, no 7, 790-793 p.Article in journal (Refereed) Published
Abstract [en]

Using numerical simulations of forced turbulence, we show that for magnetic Reynolds numbers larger than unity, that is, beyond the regime of quasilinear theory, the turbulent magnetic diffusivity attains an additional negative contribution that is quadratic in the kinetic helicity. In particular, for large magnetic Reynolds numbers, the turbulent magnetic diffusivity without helicity is about twice the value with helicity. Such a contribution was not previously anticipated, but, as we discuss, it turns out to be important when accurate estimates of the turbulent magnetic diffusivity are needed.

Place, publisher, year, edition, pages
2017. Vol. 338, no 7, 790-793 p.
Keyword [en]
magnetic fields, magnetohydrodynamics (MHD), turbulence
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-147906DOI: 10.1002/asna.201713384ISI: 000412073100004OAI: oai:DiVA.org:su-147906DiVA: diva2:1150279
Available from: 2017-10-18 Created: 2017-10-18 Last updated: 2017-10-18Bibliographically approved

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Brandenburg, AxelSchober, JenniferRogachevskii, Igor
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