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Numerical simulations of magnetic structures

Published online by Cambridge University Press:  26 August 2011

I. N. Kitiashvili ,
A. G. Kosovichev ,
A. A. Wray  and
N. N. Mansour
I. N. Kitiashvili
Affiliation:
W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA email: sasha@sun.stanford.edu, Alan.A.Wray@nasa.gov Center for Turbulence Research, Stanford University, Stanford, CA 94305, USA email: irinasun@stanford.edu
A. G. Kosovichev
Affiliation:
W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA email: sasha@sun.stanford.edu, Alan.A.Wray@nasa.gov
A. A. Wray
Affiliation:
W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA 94305, USA email: sasha@sun.stanford.edu, Alan.A.Wray@nasa.gov
N. N. Mansour
Affiliation:
NASA Ames Research Center, Moffett Field, Mountain View, CA 94040, USA email: Nagi.N.Mansour@nasa.gov
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Abstract

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We use 3D radiative MHD simulations of the upper turbulent convection layer for investigation of physical mechanisms of formation of magnetic structures on the Sun. The simulations include all essential physical processes, and are based of the LES (Large-Eddy Simulations) approach for describing the sub-grid scale turbulence. The simulation domain covers the top layer of the convection zone and the lower atmosphere. The results reveal a process of spontaneous formation of stable magnetic structures from an initially weak vertical magnetic field, uniformly distributed in the simulation domain. The process starts concentration of magnetic patches at the boundaries of granular cells, which are subsequently merged together into a stable large-scale structure by converging downdrafts below the surface. The resulting structure represents a compact concentration of strong magnetic field, reaching 6 kG in the interior. It has a cluster-like internal structurization, and is maintained by strong downdrafts extending into the deep layers.

Keywords

Sun: magnetic fieldssunspots; methods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 315 - 319
Copyright
Copyright © International Astronomical Union 2011

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