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Flux concentrations in turbulent convection

Published online by Cambridge University Press:  18 July 2013

Petri J. Käpylä ,
Axel Brandenburg ,
Nathan Kleeorin ,
Maarit J. Mantere  and
Igor Rogachevskii
Petri J. Käpylä
Affiliation:
Department of Physics, PO Box 64, FI-00014 University of Helsinki, Finland Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden
Axel Brandenburg
Affiliation:
Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden Department of Astronomy, Stockholm University, SE-10691 Stockholm, Sweden
Nathan Kleeorin
Affiliation:
Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden Department of Mechanical Engineering, Ben-Gurion University of the Negev, PO Box 653, Beer-Sheva 84105, Israel
Maarit J. Mantere
Affiliation:
Department of Physics, PO Box 64, FI-00014 University of Helsinki, Finland Department of Information and Computer Science, Aalto University, PO Box 15400, FI-00076 Aalto, Finland
Igor Rogachevskii
Affiliation:
Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden Department of Mechanical Engineering, Ben-Gurion University of the Negev, PO Box 653, Beer-Sheva 84105, Israel
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Abstract

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We present preliminary results from high resolution magneto-convection simulations where we find the formation of flux concentrations from an initially uniform magnetic field. The structures appear in roughly ten convective turnover times and live close to a turbulent diffusion time. The time scales are compatible with the negative effective magnetic pressure instability (NEMPI), although structure formation is not restricted to regions where the effective magnetic pressure is negative.

Keywords

MHD – turbulence – Sun: magnetic fields

References

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