Dynamo action driven by convection: the influence of magnetic boundary conditions

Details Dynamo action driven by convection: the influence of magnetic boundary conditions Dynamo action driven by convection: the influence of magnetic boundary conditions

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.315l..13t&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 315, Issue 2, pp. L13-L17.

Astronomy and Astrophysics

Astronomy

23

Convection, Magnetic Fields, Mhd

Scientific paper

We study the influence of different magnetic boundary conditions on the generation of magnetic fields by turbulent convection. It is found that the structure and strength of the generated field in the vicinity of the boundary is strongly dependent on the choice of boundary conditions. In the convective interior, however, the solutions remain largely insensitive to the boundary conditions. In all cases the overall efficiency of the dynamo process remains high with a steady state magnetic energy density between 12 and 25per cent of the turbulent kinetic energy, and peak field values exceeding the equipartition level. These results support the idea that the solar granulation may constitute a dynamo source for magnetic fields in the quiet photosphere.

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