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Magnetic concentrations in stratified turbulence: the negative effective magnetic pressure instability
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). Ben-Gurion University of the Negev, Israel.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben-Gurion University of the Negev, Israel.
Number of Authors: 3
2016 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 18, 125011Article in journal (Refereed) Published
Abstract [en]

In the presence of strong density stratification, hydromagnetic turbulence attains qualitatively new properties: the formation of magnetic flux concentrations. We review here the theoretical foundations of this mechanism in terms of what is now called the negative effective magnetic pressure instability. We also present direct numerical simulations of forced turbulence in strongly stratified layers and discuss the qualitative and quantitative similarities with corresponding mean-field simulations. Finally, the relevance to sunspot formation is discussed.

Place, publisher, year, edition, pages
2016. Vol. 18, 125011
Keyword [en]
stratified turbulence, dynamos, sunspots
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-140414DOI: 10.1088/1367-2630/aa513eISI: 000391599600002OAI: oai:DiVA.org:su-140414DiVA: diva2:1080600
Available from: 2017-03-10 Created: 2017-03-10 Last updated: 2017-03-10Bibliographically approved

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Brandenburg, AxelRogachevskii, Igor
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