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Collapse and Recovery of the Magnetic Field During Reversals

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Abstract

The process of polarity reversal of a magnetic dipole is considered using the two-dimensional model of the mean-field with random α-effect. The correlation of the sequence of fluctuations of α and the evolution of a magnetic dipole is investigated. It was shown that during fluctuations, which subsequently lead to inversions of the magnetic field, the dynamo system can switch to the mode of frequent changes in the dipole polarity with a lowered magnetic field, as well as to the temporal damping mode. Since the characteristic decay and generation times are different, a temporary asymmetry of the magnetic field arises during the reversal: the time of reduction of the magnetic dipole is several times longer than its growth time. The asymmetry for the geomagnetic field over the last five inversions is 4 : 1, which is close to the simulation results.

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Notes

  1. For this estimate, it is convenient to use the calculator for a normal distribution at http://stattrek.com/online-calculator/normal.aspx.

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FUNDING

This work was supported by the Russian Scientific Foundation (project 19-47-04110).

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Authors and Affiliations

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

    M. Yu. Reshetnyak

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

    M. Yu. Reshetnyak

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  1. M. Yu. Reshetnyak
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Correspondence to M. Yu. Reshetnyak.

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Translated by E. Seifina

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Reshetnyak, M.Y. Collapse and Recovery of the Magnetic Field During Reversals. Sol Syst Res 53, 254–260 (2019). https://doi.org/10.1134/S0038094619040087

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