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Coronal influence on dynamos

Published online by Cambridge University Press:  07 August 2014

Jörn Warnecke  and
Axel Brandenburg
Jörn Warnecke
Affiliation:
NORDITA, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden, email: joern@nordita.org Department of Astronomy, Stockholm University, SE-10691 Stockholm, Sweden
Axel Brandenburg
Affiliation:
NORDITA, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden, email: joern@nordita.org Department of Astronomy, Stockholm University, SE-10691 Stockholm, Sweden
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Abstract

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We report on turbulent dynamo simulations in a spherical wedge with an outer coronal layer. We apply a two-layer model where the lower layer represents the convection zone and the upper layer the solar corona. This setup is used to study the coronal influence on the dynamo action beneath the surface. Increasing the radial coronal extent gradually to three times the solar radius and changing the magnetic Reynolds number, we find that dynamo action benefits from the additional coronal extent in terms of higher magnetic energy in the saturated stage. The flux of magnetic helicity can play an important role in this context.

Keywords

MHDSun: magnetic fieldsSun: activitySun: rotationturbulenceSun: corona

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