EARTH’S CORE EVOLUTION AND GEODYNAMO

 2021 M.Yu. Reshetnyak

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

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation,
Russian Academy of Sciences, Moscow; Troitsk, Russia

e-mail: m.reshetnyak@gmail.com

Abstract. The paper considers the sequential selection of parameters in the model of cooling the Earth's core. The model describes the evolution of the core since its formation after accretion 4.5 billion years ago, the appearance of a solid core, and also assumes extrapolation by 1.5 billion years into the future. It is shown how the imposed conditions, in particular, the size and age of the solid core, the requirements imposed by the geodynamo, change the process of cooling and growth of the solid core. Scenarios of evolution are considered when the appearance of a solid core does not lead to significant variations in the energy available for the generation of the magnetic field and the efficiency of the dynamo mechanism introduced by analogy with the Carnot cycle.

Keywords: evolution of the Earth, liquid core, Earth’s energetics, entropy, geodynamo, Carnot cycle.

About the author

RESHETNYAK Maxim Yurievich – Schmidt Institute of Physics of the Earth, Russian Academy of Sciences. Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1; Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences. Russia, 108840, Moscow; Troitsk, Kaluzhskoe Hwy, 4. E-mail: m.reshetnyak@gmail.com

Cite this article as: Reshetnyak M.Yu. Earth’s core evolution and geodynamo, Geofizicheskie Protsessy i Biosfera (Geophysical Processes and Biosphere), 2021, vol. 20, no. 1, pp. 68–76 (in Russian). https://doi.org/10.21455/GPB2021.1-7

English version: Izvestiya, Atmospheric and Oceanic Physics, 2021, vol. 57, iss. 7. ISSN: 0001-4338 (Print), 1555-628X (Online). https://link.springer.com/journal/volumesAndIssues/11485