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The mechanism of generation of magnetic field by thermal convection is investigated by analyzing the numerical solution to the Boussinesq magneto-hydrodynamic equations in a rotating spherical shell. The magnetic flux lines are intensified by concentrate-and-stretch around sinks in the outer boundary layer, on the equatorial plane and in the inner boundary layer, and the strong magnetic field is generated downstream of them. The magnetic flux lines are being stretched there irrespective of whether fluid elements accelerate or decelerate.
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Kitauchi et al. (1998) studied this question.
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