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Sharp magnetic structures from dynamos with density stratification
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Monash Univ, Australia; Stockholm Univ, Sweden.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Sweden; Univ Colorado, USA; Lab Atmospher & Space Phys, USA.ORCID iD: 0000-0002-7304-021X
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Sweden; Ben Gurion Univ Negev, Israel.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Stockholm Univ, Sweden; Ben Gurion Univ Negev, Israel.
2017 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 467, no 3, p. 2753-2765Article in journal (Refereed) Published
Abstract [en]

Recent direct numerical simulations (DNS) of large-scale turbulent dynamos in strongly stratified layers have resulted in surprisingly sharp bipolar structures at the surface. Here, we present new DNS of helically and non-helically forced turbulence with and without rotation and compare with corresponding mean-field simulations (MFS) to show that these structures are a generic outcome of a broader class of dynamos in density-stratified layers. The MFS agree qualitatively with the DNS, but the period of oscillations tends to be longer in the DNS. In both DNS and MFS, the sharp structures are produced by converging flows at the surface and might be driven in non-linear stage of evolution by the Lorentz force associated with the large-scale dynamo-driven magnetic field if the dynamo number is at least 2.5 times supercritical.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2017. Vol. 467, no 3, p. 2753-2765
Keywords [en]
dynamo, turbulence, sunspots
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-206233DOI: 10.1093/mnras/stx148ISI: 000398419400020OAI: oai:DiVA.org:kth-206233DiVA, id: diva2:1096175
Note

QC 20170517

Available from: 2017-05-17 Created: 2017-05-17 Last updated: 2017-05-17Bibliographically approved

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Brandenburg, Axel

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Jabbari, SarahBrandenburg, AxelKleeorin, NathanRogachevskii, Igor
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