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To study the onset of a stationary dynamo in the presence of inner or outerwalls of various electromagnetic properties, we propose a simple 1D-model inwhich the flow is replaced by an alpha effect. The equation of dispersion ofthe problem is derived analytically. It is solved numerically for walls ofdifferent thicknesses and of electric conductivity and magnetic permeabilitydifferent from those of the fluid in motion. We also consider walls in thelimit of infinite conductivity or permeability.

Influence of inner and outer walls electromagnetic properties on the onset of a stationary dynamo