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Bipolar magnetic structures driven by stratified turbulence with a coronal envelope
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.ORCID iD: 0000-0002-7304-021X
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.
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2013 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, Vol. 777, no 2, L37- p.Article in journal (Refereed) Published
Abstract [en]

We report the spontaneous formation of bipolar magnetic structures in direct numerical simulations of stratified forced turbulence with an outer coronal envelope. The turbulence is forced with transverse random waves only in the lower (turbulent) part of the domain. Our initial magnetic field is either uniform in the entire domain or confined to the turbulent layer. After about 1-2 turbulent diffusion times, a bipolar magnetic region of vertical field develops with two coherent circular structures that live during one turbulent diffusion time, and then decay during 0.5 turbulent diffusion times. The resulting magnetic field strengths inside the bipolar region are comparable to the equipartition value with respect to the turbulent kinetic energy. The bipolar magnetic region forms a loop-like structure in the upper coronal layer. We associate the magnetic structure formation with the negative effective magnetic pressure instability in the two-layer model.

Place, publisher, year, edition, pages
2013. Vol. 777, no 2, L37- p.
Keyword [en]
magnetohydrodynamics (MHD), starspots, Sun: corona, sunspots, turbulence
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-134723DOI: 10.1088/2041-8205/777/2/L37ISI: 000326266500019Scopus ID: 2-s2.0-84886770467OAI: oai:DiVA.org:kth-134723DiVA: diva2:668290
Funder
EU, European Research Council, 227952 227915Swedish Research Council, 621-2011-5076 2012-5797
Note

QC 20131129

Available from: 2013-11-29 Created: 2013-11-28 Last updated: 2013-11-29Bibliographically approved

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Brandenburg, Axel

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Warnecke, JörnLosada, Illa R.Brandenburg, AxelKleeorin, NathanRogachevskii, Igor
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CiteExportLink to record
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  • apa
  • harvard1
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More styles
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  • de-DE
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Output format
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