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Ion Acceleration at the Front of Nonlinear Whistlers

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Abstract

We have solved the problem of the acceleration of ions (protons) incident on the front of a nonlinear whistler for which the structure of its electromagnetic fields is assumed to be known and defined by the relations derived by us previously. We have established the dependence of the energy to which the protons are accelerated on the angle between the whistler propagation direction and the direction of the external magnetic field and on the whistler speed. The results obtained are applied to the Earth’s bow shock by assuming that the bow shock front has the structure of a nonlinear whistler. We show that the protons are accelerated at the Earth’s bow shock front to 45 keV and end up with such energies upstream of the bow shock in the foreshock region. In our opinion, being scattered by the oscillations existing in the foreshock, these energetic protons form a population of so-called diffuse ions upstream of the bow shock.

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Funding

This work was performed within project II.16.1.3 of Basic Research Program II.16.1 of the Siberian Branch of the Russian Academy of Sciences (priority direction II.16).

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Authors and Affiliations

  1. Institute of Solar–Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, P.O. Box 4026, Irkutsk, 664033, Russia

    G. N. Kichigin

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  1. G. N. Kichigin
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Correspondence to G. N. Kichigin.

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Translated by V. Astakhov

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Kichigin, G.N. Ion Acceleration at the Front of Nonlinear Whistlers. Astron. Lett. 46, 422–427 (2020). https://doi.org/10.1134/S1063773720060043

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