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NEGATIVE MAGNETIC EDDY DIFFUSIVITIES FROM THE TEST-FIELD METHOD AND MULTISCALE STABILITY THEORY
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).ORCID-id: 0000-0002-7304-021X
Rekke forfattare: 42015 (engelsk)Inngår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 811, nr 2, artikkel-id 135Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The generation of a large-scale magnetic field in the kinematic regime in the absence of an alpha-effect is investigated by following two different approaches: the test-field method and the multiscale stability theory relying on the homogenization technique. Our computations of the magnetic eddy diffusivity tensor of the parity-invariant flow IV of G. O. Roberts and the modified Taylor-Green flow confirm the findings of previous studies. and also explain some of their apparent contradictions. The two flows have large symmetry groups; this is used to considerably simplify the eddy diffusivity tensor. Finally, a new analytic result is presented: upon expressing the eddy diffusivity tensor in terms of solutions to auxiliary problems for the adjoint operator, we derive relations between the magnetic eddy diffusivity tensors that arise for mutually reverse small-scale flows v(x) and - v(x).

sted, utgiver, år, opplag, sider
2015. Vol. 811, nr 2, artikkel-id 135
Emneord [en]
dynamo, magnetic fields, magnetohydrodynamics (MHD), turbulence
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-123330DOI: 10.1088/0004-637X/811/2/135ISI: 000363513800063OAI: oai:DiVA.org:su-123330DiVA, id: diva2:874242
Tilgjengelig fra: 2015-11-26 Laget: 2015-11-24 Sist oppdatert: 2022-02-23bibliografisk kontrollert

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