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The contribution of kinetic helicity to turbulent magnetic diffusivity
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado; JILA and Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, Colorado; Department of Astronomy, AlbaNova University Center, Stockholm University, Stockholm, Sweden.ORCID iD: 0000-0002-7304-021X
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado; Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
2017 (English)In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 338, no 7, p. 790-793Article 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
WILEY-V C H VERLAG GMBH , 2017. Vol. 338, no 7, p. 790-793
Keywords [en]
magnetic fields, magnetohydrodynamics (MHD), turbulence
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-215839DOI: 10.1002/asna.201713384ISI: 000412073100004Scopus ID: 2-s2.0-8503024580OAI: oai:DiVA.org:kth-215839DiVA, id: diva2:1149813
Note

QC 20171017. 

NSF Astrophysics and Astronomy Grant Program, 1615100. Research Council of Norway, FRINATEK 231444. National Science Foundation, CNS-0821794. University of Colorado Boulder. University of Colorado Denver. National Center for Atmospheric Research.

Available from: 2017-10-17 Created: 2017-10-17 Last updated: 2017-10-17Bibliographically approved

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