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Diffusive scattering of energetic electrons by intense whistler-mode waves in an inhomogeneous plasma

Published online by Cambridge University Press:  06 January 2023

Viktor A. Frantsuzov Open the ORCID record for Viktor A. Frantsuzov [Opens in a new window] ,
Anton V. Artemyev Open the ORCID record for Anton V. Artemyev [Opens in a new window] ,
Xiao-Jia Zhang ,
Oliver Allanson Open the ORCID record for Oliver Allanson [Opens in a new window] ,
Pavel I. Shustov  and
Anatoli A. Petrukovich
Viktor A. Frantsuzov*
Affiliation:
Space Research Institute of the Russian Academy of Sciences (IKI), 84/32 Profsoyuznaya Str., Moscow 117997, Russia Faculty of Physics, National Research University Higher School of Economics, 21/4 Staraya Basmannaya Ulitsa, Moscow 105066, Russia
Anton V. Artemyev
Affiliation:
Space Research Institute of the Russian Academy of Sciences (IKI), 84/32 Profsoyuznaya Str., Moscow 117997, Russia Institute of Geophysics and Planetary Physics, UCLA, Los Angeles, CA 90095, USA
Xiao-Jia Zhang
Affiliation:
Institute of Geophysics and Planetary Physics, UCLA, Los Angeles, CA 90095, USA
Oliver Allanson
Affiliation:
Department of Mathematics, University of Exeter, Penryn/Cornwall Campus, Penryn, TR10 9FE, UK
Pavel I. Shustov
Affiliation:
Space Research Institute of the Russian Academy of Sciences (IKI), 84/32 Profsoyuznaya Str., Moscow 117997, Russia Faculty of Physics, National Research University Higher School of Economics, 21/4 Staraya Basmannaya Ulitsa, Moscow 105066, Russia
Anatoli A. Petrukovich
Affiliation:
Space Research Institute of the Russian Academy of Sciences (IKI), 84/32 Profsoyuznaya Str., Moscow 117997, Russia
*
†Email address for correspondence: vafrantsuzov@outlook.com
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Abstract

Electron resonant interactions with electromagnetic whistler-mode waves play an important role in electron flux dynamics in various space plasma systems: planetary radiation belts, bow shocks, solar wind and magnetic reconnection regions. Two key wave characteristics determining the regime of wave–particle interactions are the wave intensity and the wave coherency. The classical quasi-linear diffusion approach describes well electron diffusion by incoherent and low-amplitude waves, whereas the nonlinear resonant models describe electron phase bunching and trapping by highly coherent intense waves. This study is devoted to the investigation of the regime of electron resonant interactions with incoherent but intense waves. Although this regime is characterized by electron diffusion, we show that diffusion rates scale linearly with the wave amplitude, $D\propto B_w$, in contrast to the quasi-linear diffusion scaling $D_{QL}\propto B_w^2$. Using observed wave amplitude distributions, we demonstrate that the quasi-linear diffusion model significantly overestimates electron scattering by incoherent, but intense whistler-mode waves. We discuss the results obtained in the context of simulations of long-term electron flux dynamics in space plasma systems.

Keywords

plasma dynamicsspace plasma physicsplasma nonlinear phenomena
Type
Research Article
Information
Journal of Plasma Physics , Volume 89 , Issue 1 , February 2023 , 905890101
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Copyright © The Author(s), 2023. Published by Cambridge University Press

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References

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