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Probability of relativistic electron trapping by parallel and oblique whistler-mode waves in Earth's radiation belts

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posted on 04.01.2016, 12:38 by A.V. Artemyev, Alexei Vasiliev, D. Mourenas, Anatoly Neishtadt, O.V. Agapitov, V. Krasnoselskikh
We investigate electron trapping by high-amplitude whistler-mode waves propagating at small as well as large angles relative to geomagnetic field lines. The inhomogeneity of the background magnetic field can result in an effective acceleration of trapped particles. Here, we derive useful analytical expressions for the probability of electron trapping by both parallel and oblique waves, paving the way for a full analytical description of trapping effects on the particle distribution. Numerical integrations of particle trajectories allow to demonstrate the accuracy of the derived analytical estimates. For realistic wave amplitudes, the levels of probabilities of trapping are generally comparable for oblique and parallel waves, but they turn out to be most efficient over complementary energy ranges. Trapping acceleration of <100 keV electrons is mainly provided by oblique waves, while parallel waves are responsible for the trapping acceleration of >100 keV electrons.

Funding

Work by A.A.V. and V.A.A. was supported by RFBR no.13-01-00251. Work by N.A.I. was supported by 9NSh-2964.2014.1. Work by O.A. was performed under JHU/APL Contract No. 922613 (RBSP-EFW).

History

School

  • Science

Department

  • Mathematical Sciences

Published in

Physics of Plasmas

Volume

22

Issue

11

Citation

ARTEMYEV, A.V. ...et al., 2015. Probability of relativistic electron trapping by parallel and oblique whistler-mode waves in Earth's radiation belts. Physics of Plasmas, 22, 112903.

Publisher

© American Institute of Physics

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VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2015

Notes

Reprinted with permission from ARTEMYEV, A.V. ...et al., 2015. Probability of relativistic electron trapping by parallel and oblique whistler-mode waves in Earth's radiation belts. Physics of Plasmas, 22, 112903. Copyright 2015, American Institute of Physics.

ISSN

1070-664X

eISSN

1089-7674

Language

en

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