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SELF-ASSEMBLY OF SHALLOW MAGNETIC SPOTS THROUGH STRONGLY STRATIFIED TURBULENCE
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben Gurion University.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben Gurion University.
2013 (English)In: Astrophysical journal. Letters, ISSN 2041-8205, Vol. 776, no 2, L23- p.Article in journal (Refereed) Published
Abstract [en]

Recent studies have demonstrated that in fully developed turbulence, the effective magnetic pressure of a large-scale field (non-turbulent plus turbulent contributions) can become negative. In the presence of strongly stratified turbulence, this was shown to lead to a large-scale instability that produces spontaneous magnetic flux concentrations. Furthermore, using a horizontal magnetic field, elongated flux concentrations with a strength of a few percent of the equipartition value were found. Here we show that a uniform vertical magnetic field leads to circular magnetic spots of equipartition field strengths. This could represent a minimalistic model of sunspot formation and highlights the importance of two critical ingredients: turbulence and strong stratification. Radiation, ionization, and supergranulation may be important for realistic simulations, but are not critical at the level of a minimalistic model of magnetic spot formation.

Place, publisher, year, edition, pages
2013. Vol. 776, no 2, L23- p.
Keyword [en]
magnetohydrodynamics (MHD), starspots, sunspots, turbulence
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-95742DOI: 10.1088/2041-8205/776/2/L23ISI: 000325490200006OAI: oai:DiVA.org:su-95742DiVA: diva2:662334
Note

AuthorCount:3;

Available from: 2013-11-06 Created: 2013-11-04 Last updated: 2013-11-06Bibliographically approved

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