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Ejections of Magnetic Structures Above a Spherical Wedge Driven by a Convective Dynamo with Differential Rotation
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
2012 (English)In: Solar Physics, ISSN 0038-0938, E-ISSN 1573-093X, Vol. 280, no 2, 299-319 p.Article in journal (Refereed) Published
Abstract [en]

We combine a convectively driven dynamo in a spherical shell with a nearly isothermal density-stratified cooling layer that mimics some aspects of a stellar corona to study the emergence and ejections of magnetic field structures. This approach is an extension of earlier models, where forced turbulence simulations were employed to generate magnetic fields. A spherical wedge is used which consists of a convection zone and an extended coronal region to a parts per thousand aEuro parts per thousand 1.5 times the radius of the sphere. The wedge contains a quarter of the azimuthal extent of the sphere and 150(a similar to) in latitude. The magnetic field is self-consistently generated by the turbulent motions due to convection beneath the surface. Magnetic fields are found to emerge at the surface and are ejected to the coronal part of the domain. These ejections occur at irregular intervals and are weaker than in earlier work. We tentatively associate these events with coronal mass ejections on the Sun, even though our model of the solar atmosphere is rather simplistic.

Place, publisher, year, edition, pages
2012. Vol. 280, no 2, 299-319 p.
Keyword [en]
Magnetic fields, corona, Coronal mass ejections, theory, Interior, convective zone, Turbulence, Helicity current
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-105015DOI: 10.1007/s11207-012-0108-4ISI: 000309865800002ScopusID: 2-s2.0-84867507839OAI: diva2:570314
EU, FP7, Seventh Framework Programme, 228398EU, European Research Council, 227952Swedish Research Council, 621-2007-4064

QC 20121119

Available from: 2012-11-19 Created: 2012-11-15 Last updated: 2013-08-28Bibliographically approved

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Warnecke, JörnKäpylä, Petri J.Brandenburg, Axel
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