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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 Open the ORCID record for Jiao-Jiao Cheng [Opens in a new window] ,
Fang-Ping Wang Open the ORCID record for Fang-Ping Wang [Opens in a new window] ,
Zhong-Zheng Li Open the ORCID record for Zhong-Zheng Li [Opens in a new window]  and
Wen-Shan Duan
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
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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.

Keywords

plasma instabilitiesplasma nonlinear phenomenaplasma waves
Type
Research Article
Information
Journal of Plasma Physics , Volume 90 , Issue 1 , February 2024 , 905900121
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Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

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