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Helical waves of the finite amplitude on a surface of the fluid conducting Earth core are examined for genera- tion of the magnetic field. Estimates are made for the differ- entially rotating cylindrical conducting fluid body, with the helical surface wave structure on its top. This structure is similar to the self-exciting Faraday-disk homopolar hetero- geneous dynamo. Estimations of angular velocity and mag- netic field magnitude for a polar vortex on the surface of the Earth's liquid outer core gives reasonable numbers and proves this hypothesis to be of value for further detailed anal- ysis. As magnetic field generation by the helical structure is a surface effect, it is possible to find connection between Earth magnetic field fluctuations and fast relief changes on the iron fluid core - the silicate mantle boundary of the Earth.

Finite amplitudes helical waves on the surface of the conducting fluid earth core as an example of the self-exciting homopolar heterogeneous dynamo