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The Karlsruhe Dynamo experiment is aimed at showing that a liquid sodium flow in an array of columnar helical vortices, confined in a cylindrical container, can generate a magnetic field by self-excitation. The flow structures in the liquid core of the Earth are topologically comparable to those being realized within the Karlsruhe test module. In three test series it has been demonstrated that magnetic self-excitation occurs and a permanent magnetic saturation field develops which oscillatesdoi:10.5194/npg-9-165-2002 fatcat:k2j2maeab5hrplzxfb4u423ue4