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Modulational instability of the interacting electron whistlers and magnetosonic perturbations

Published online by Cambridge University Press:  28 February 2024

Jiao-Jiao Cheng*
Affiliation:
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, PR China
Fang-Ping Wang
Affiliation:
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, PR China
Zhong-Zheng Li
Affiliation:
Department of Physics, Gansu Normal University For Nationalities, Hezuo 747000, PR China
Wen-Shan Duan*
Affiliation:
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, PR China
*
Email addresses for correspondence: chengjj3863@126.com, duanws@nwnu.edu.cn
Email addresses for correspondence: chengjj3863@126.com, duanws@nwnu.edu.cn

Abstract

A modulational instability of nonlinearly interacting electron whistlers and magnetosonic perturbations is studied in the present paper. For typical parameters, there is no modulational instability. However, modulational instability appears in special cases. For example, when the whistler wavenumber is small enough, there is modulational instability. Its growth rate decreases as the angle between the external magnetic field and the perturbed wave's direction increases, while it increases as the whistler wavenumber increases. It is also found that there is no modulational instability when the whistler wavenumber is larger than a critical value ($k_0 > 0.05$), in which the perturbed wave frequency increases as the angle between the external magnetic field and the perturbed wave's direction increases when the angle between the external magnetic field and the perturbed wave's direction is large enough. Whereas, the perturbed wave frequency first increases as the whistler wavenumber increases, reaches a peak value and then decreases as whistler wavenumber increases.

Type
Research Article
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

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