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Bicentennial Evolution and Statistics of Times of Variations in the Energy of the Potential Geomagnetic Field

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Abstract

This paper examines two centuries of the evolution of the integral energy and power of the observed potential geomagnetic field. The research results make it possible to define the variation times as energy-to-power ratios. Using exponents as basic functions, we analyze statistically the annual variation times, which are mainly on the order of 1000 years and correspond to an energy decrease. This is consistent with the harmonic/vacillation variations observed and the geodynamo and ancient field models. A sharp decrease in energy dominates, with an almost discrete quincentennial but, generally, locally continuous and bimodal spectrum with maxima of 480 and 2400 years. In order to estimate the electrical conductivity of the Earth’s core, we correlated the extreme variation times with inversions and magnetic diffusion.

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ACKNOWLEDGMENTS

The authors are grateful to the anonymous reviewer who provided an in-depth analysis and unbiased criticism of the original version of this paper, which inspired the authors to significantly revise and radically improve it. The second reviewer, A.V. Khokhlov, contributed as much to the improvement of this paper in terms of the formulation of its fundamentals, estimation of errors, and discrimination between qualitative, numerical, and heuristic provisions.

Funding

This work was supported by the Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences as a part of state funding under the Program of Basic Scientific Research of State Academies of Sciences, “Research on the Magnetism of the Earth and Planets,” project no. 0037-2014-0004.

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  1. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences (IZMIRAN), 108840, Troitsk, Moscow, Russia

    S. V. Starchenko & S. V. Yakovleva

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  1. S. V. Starchenko
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  2. S. V. Yakovleva
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Correspondence to S. V. Starchenko or S. V. Yakovleva.

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Translated by N. Semenova

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Starchenko, S.V., Yakovleva, S.V. Bicentennial Evolution and Statistics of Times of Variations in the Energy of the Potential Geomagnetic Field. Geomagn. Aeron. 61, 763–772 (2021). https://doi.org/10.1134/S0016793221050121

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