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

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 cont...

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Bibliographic Details
Published inGeomagnetism and Aeronomy Vol. 58; no. 7; pp. 888 - 892
Main Authors Sokoloff, D. D., Shibalova, A. S.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.12.2018
Springer Nature B.V
Subjects
Computational fluid dynamics
Dynamo theory
Earth and Environmental Science
Earth Sciences
Fluid flow
Geomagnetic field
Geomagnetism
Geophysics/Geodesy
Inversions
Magnetic fields
Magnetism
Magnetohydrodynamic equations
Magnetohydrodynamics
Periodic variations
Resonant frequencies
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Summary: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.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S0016793218070198