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Long-term evolution of electron distribution function due to nonlinear resonant interaction with whistler mode waves

Part of: Focus on Plasma Astrophysics

Published online by Cambridge University Press:  05 April 2018

Anton V. Artemyev ,
Anatoly I. Neishtadt ,
Alexei A. Vasiliev  and
Didier Mourenas
Anton V. Artemyev*
Affiliation:
Institute of Geophysics and Planetary Physics, University of California, Los Angeles, California, USA Space Research Institute, Moscow, Russia
Anatoly I. Neishtadt
Affiliation:
Space Research Institute, Moscow, Russia Department of Mathematical Sciences, Loughborough University, Loughborough LE11 3TU, UK
Alexei A. Vasiliev
Affiliation:
Space Research Institute, Moscow, Russia
Didier Mourenas
Affiliation:
CEA, DAM, DIF, Arpajon, France
*
†Email address for correspondence: [email protected]
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Abstract

Accurately modelling and forecasting of the dynamics of the Earth’s radiation belts with the available computer resources represents an important challenge that still requires significant advances in the theoretical plasma physics field of wave–particle resonant interaction. Energetic electron acceleration or scattering into the Earth’s atmosphere are essentially controlled by their resonances with electromagnetic whistler mode waves. The quasi-linear diffusion equation describes well this resonant interaction for low intensity waves. During the last decade, however, spacecraft observations in the radiation belts have revealed a large number of whistler mode waves with sufficiently high intensity to interact with electrons in the nonlinear regime. A kinetic equation including such nonlinear wave–particle interactions and describing the long-term evolution of the electron distribution is the focus of the present paper. Using the Hamiltonian theory of resonant phenomena, we describe individual electron resonance with an intense coherent whistler mode wave. The derived characteristics of such a resonance are incorporated into a generalized kinetic equation which includes non-local transport in energy space. This transport is produced by resonant electron trapping and nonlinear acceleration. We describe the methods allowing the construction of nonlinear resonant terms in the kinetic equation and discuss possible applications of this equation.

Keywords

wave-particle interaction
Type
Research Article
Information
Journal of Plasma Physics , Volume 84 , Issue 2 , April 2018 , 905840206
Copyright
© Cambridge University Press 2018 

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