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Electron Resonant Interaction With Coherent ULF Waves: Hamiltonian Approach
Journal article   Open access   Peer reviewed

Electron Resonant Interaction With Coherent ULF Waves: Hamiltonian Approach

Anton Artemyev, Xin An, Dmitri Vainchtein, Robert Rankin, Xuzhi Zhou, Li Li and Xiao-Jia Zhang
Journal of geophysical research. Space physics, v 129(4), 2023
01 Apr 2024
url
https://doi.org/10.1029/2023JA032178View
Published, Version of Record (VoR) Open

Abstract

Astronomy & Astrophysics Physical Sciences Science & Technology
Electron resonant interaction with ultra-low-frequency (ULF) waves is considered to be a driver of electron radial transport in Earth's inner magnetosphere. Traditional concept of such interaction assumes the electron slow diffusive scattering by a broad-band ULF spectrum, but recent spacecraft observations reported a possibility for electrons to resonate nonlinearly with intense coherent ULF waves. This study proposes a theoretical model describing the main elements of such nonlinear resonant interactions. We implement a Hamiltonian approach to describe equatorial electron motion in a dipole magnetic field and electric ULF wavefield and demonstrate the ULF-electron interactions has two basic nonlinear resonant regimes: phase bunching and phase trapping. Finally, we discuss possible applications of the proposed theoretical approach and the importance of ULF-electron nonlinear resonances. A Hamiltonian formalism for Euler potentials in a resonant system is proposed The proposed Hamiltonian is used to develop a theoretical model of nonlinear ULF-electron resonant interactions Phase trapping and bunching effects for electron resonances with ultra-low-frequency waves is demonstrated

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Astronomy & Astrophysics
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