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Non-uniformity effects in the negative effective magnetic pressure instability
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben Gurion Univ Negev, Dept Mech Engn, IL-84105 Beer Sheva, Israel.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben Gurion Univ Negev, Dept Mech Engn, IL-84105 Beer Sheva, Israel.
2013 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. T155, 014027- p.Article in journal (Refereed) Published
Abstract [en]

In direct numerical simulations of strongly stratified turbulence we have previously studied the development of large scale magnetic structures starting from a uniform background field. This is caused by an instability resulting from a negative contribution of small-scale turbulence to the effective (mean-field) magnetic pressure, and was qualitatively reproduced in mean-field simulations (MFS) where this pressure reduction was modeled as a function of the mean magnetic field normalized by the equipartition field. We now investigate the effect of mean current density on the turbulent pressure reduction. In our MFS, such currents are associated with sharp gradients of the growing structures. We find that an enhanced mean current density increases the suppression of the turbulent pressure.

Place, publisher, year, edition, pages
2013. Vol. T155, 014027- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-92806DOI: 10.1088/0031-8949/2013/T155/014027ISI: 000321863000029OAI: oai:DiVA.org:su-92806DiVA: diva2:642734
Note

AuthorCount:4;

Funding Agencies:

European Research Council  227952  227915; Swedish Research Council  621-2011-5076;  COST Action  MP0806;  Government of the Russian Federation  11.G34.31.0048 

Available from: 2013-08-23 Created: 2013-08-20 Last updated: 2017-12-06Bibliographically approved

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