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Superfast ion scattering by solar wind discontinuities

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journal contribution
posted on 21.08.2020, 13:59 by Anton Artemyev, Anatoly Neishtadt, Alexey Vasiliev, Vassilis Angelopoulos, Alexander Vinogradov, Lev Zelenyi
Large-amplitude fluctuations of the solar wind magnetic field can scatter energetic ions. One of the main contributions to these fluctuations is provided by solar wind discontinuities, i.e. rapid rotations of the magnetic field. This study shows that the internal configuration of such discontinuities plays a crucial role in energetic ion scattering in pitch-angles. Kinetic-scale discontinuities accomplish very fast ion pitch-angle scattering. The main mechanism of such pitch-angle scattering is the adiabatic invariant destruction due to separatrix crossings in the phase space. We demonstrate that efficiency of this scattering does not depend on the magnetic field component across the discontinuity surface, i.e. both rotational and almost tangential discontinuities scatter energetic ions with the same efficiency. We also examine how the strong scattering effect depends on the deviations of the discontinuity magnetic field from the force-free one.

Funding

Russian Scientific Foundation, project 19-12-0031.

Leverhulme Trust (grant # RPG2018-143).

Russian Science Foundation (grant # 20-42-04418).

History

School

  • Science

Department

  • Mathematical Sciences

Published in

Physical Review E: covering statistical, nonlinear, biological, and soft matter physics

Volume

102

Issue

3

Publisher

American Physical Society

Version

AM (Accepted Manuscript)

Rights holder

© American Physical Society

Publisher statement

This paper was accepted for publication in the journal Physical Review E: covering statistical, nonlinear, biological, and soft matter physics and the definitive published version is available at https://doi.org/10.1103/PhysRevE.102.033201.

Acceptance date

20/08/2020

Publication date

2020-09-02

Copyright date

2020

ISSN

1539-3755

eISSN

1550-2376

Language

en

Depositor

Prof Anatoly Neishtadt. Deposit date: 20 August 2020

Article number

033201

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