Equations of motion near cyclotron resonance

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fspas-09-910224.pdf(11.22 MB)
Published version
Date
2022-06-16
Authors
Albert, J.M.
Artemyev, A.
Li, Wen
Gan, Longzhi
Ma, Q.
Version
Published version
OA Version
Citation
J. Albert, A. Artemyev, W. Li, L. Gan, Q. Ma. 2022. "Equations of Motion Near Cyclotron Resonance" Front. Astron. Space Sci. https://doi.org/10.3389/fspas.2022.910224
Abstract
This work compares several versions of the equations of motion for a test particle encountering cyclotron resonance with a single, field-aligned whistler mode wave. The gyro-averaged Lorentz equation produces both widespread phase trapping (PT) and “positive phase bunching” of low pitch angle electrons by large amplitude waves. Approximations allow a Hamiltonian description to be reduced to a single pair of conjugate variables, which can account for PT as well as phase bunching at moderate pitch angle, and has recently been used to investigate this unexpected bahavior at low pitch angle. Here, numerical simulations using the Lorentz equation and several versions of Hamiltonian-based equations of motion are compared. Similar behavior at low pitch angle is found in each case.
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Copyright © 2022 Albert, Artemyev, Li, Gan and Ma. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.