Plasma and Fusion Research

Volume 19, 1201033 (2024)

Rapid Communications

Generation of the Harmonic Structure of Upper Hybrid and Electron Cyclotron Waves Driven by Energetic Electrons
Tsubasa KOTANI1), Mieko TOIDA2,3), Toseo MORITAKA2,3), Satoshi TAGUCHI4)
1)
Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
2)
National Institute for Fusion Science, Toki 509-5202, Japan
3)
The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
4)
Department of Geophysics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
(Received 28 August 2024 / Accepted 1 October 2024 / Published 20 December 2024)

Abstract

This is the first report of the harmonic structure of upper hybrid waves (UHWs). Using a one-dimensional electromagnetic particle-in-cell simulation, it is demonstrated that the harmonic structure of UHWs can be generated by energetic electrons through non-linear wave-wave coupling, similar to that of lower hybrid waves by energetic ions. After the saturation of UHWs, furthermore, it is found that electron cyclotron waves (ECWs) gradually grow due to the injection of energetic electrons. The involvement of ECWs in non-linear wave-wave coupling can make the harmonic structure of UHWs more complex.

Keywords

upper hybrid waves, electron cyclotron waves, non-linear wave-wave coupling, energetic electrons

DOI: 10.1585/pfr.19.1201033

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