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À propos de : The effects of vertical outflows on disk dynamos        

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  • The effects of vertical outflows on disk dynamos
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  • We consider the effect of vertical outflows on the mean-field dynamo in a thin disk. These outflows could be due to winds or magnetic buoyancy. We analyse both two-dimensional finite-difference numerical solutions of the axisymmetric dynamo equations and a free-decay mode expansion using the thin-disk approximation. Contrary to expectations, a vertical velocity can enhance dynamo action, provided the velocity is not too strong. In the nonlinear regime this can lead to super-exponential growth of the magnetic field.
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  • aa10498
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  • © ESO, 2001
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  • ESO
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