Traces of Periodicity in the Observational Data on Magnetic Fields of Celestial Bodies and the Dynamo Models


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Abstract

From the viewpoint of dynamo theory, periodic behavior of the magnetic field is interpreted as a manifestation of the eigenmode in magnetohydrodynamic equations describing the dynamo. The alternative explanation is that we are dealing with a demonstration of different fluctuations of the dynamo control parameters rather than with a periodic process. A simplified geodynamo model is considered; it is able to reproduce a scale of inversions that is similar to the real scale and a priori does not describe excitations of a periodically varying magnetic field. The analysis shows that, according to the currently available data on the scale of geomagnetic field polarities, the presence of a eigen frequency corresponding to a period of about 50 Ma is not fixed in the geodynamo problem.

About the authors

D. D. Sokoloff

Physics Department, Moscow State University

Author for correspondence.
Email: sokoloff.dd@gmail.com
Russian Federation, Moscow, 119991

A. S. Shibalova

Physics Department, Moscow State University

Author for correspondence.
Email: as.shibalova@physics.msu.ru
Russian Federation, Moscow, 119991

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