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Evolution of the Earth and Geodynamo

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Abstract—

This paper considers a sequential selection of parameters in a model of cooling of the Earth’s core. The model describes the evolution from the moment of the core formation after the Earth’s accretion at 4.5 Ga and the formation of a solid core and allows future extrapolation for 1.5 Ga. It is shown how the conditions, in particular, the size and the age of the solid core, as well as the requirement for the geodynamo, change the process of cooling and growth of the solid core. The evolution scenarios are considered when the onset of the solid core yields no significant variations in energy, which is available for the generation of the magnetic field and effective dynamomechanism introduced similarly to the Carnot cycle.

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Funding

This work was supported by the Russian Science Foundation, project no. 19-47-04110.

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123242, Moscow, Russia

    M. Yu. Reshetnyak

  2. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Russian Academy of Sciences, 108840, Moscow, Troitsk, Russia

    M. Yu. Reshetnyak

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Correspondence to M. Yu. Reshetnyak.

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Translated by I. Melekestseva

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Reshetnyak, M.Y. Evolution of the Earth and Geodynamo. Izv. Atmos. Ocean. Phys. 57, 746–753 (2021). https://doi.org/10.1134/S0001433821070094

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