Title:
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Convective Pumping of Magnetic Fields: On the Flux Storage 
Problem for Solar-like Dynamos

Authors:
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Bertil Dorch (ESMN, Royal Swedish Academy of Science, Stockholm)
Boris Gudiksen (ESMN, Royal Swedish Academy of Science, Stockholm)
Bill Abbett (SSL, Berkeley, USA)
Åke Nordlund (NBIfAFG, Copenhagen University, Denmark)

Abstract:
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We present 3-d numerical magneto-hydrodynamic simulations of a buoyant, twisted
magnetic flux rope embedded in a stratified, solar-like model convection zone.
The flux rope is given an initial twist such that it neither kinks nor
fragments during its ascent. Moreover, its magnetic energy content with respect
to convection is chosen so that the flux rope retains its basic geometry while
being deflected from a purely vertical ascent by convective flows. The
simulations show that magnetic flux is advected away from the core of the flux
rope as it interacts with the convection.
The results thus support the
idea that the amount of toroidal flux stored at or near the bottom of the
solar convection zone may currently be underestimated.

Appeared in:
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A&A 380, 734