An alternative form of the fundamental plasma emission through the coalescence of Z-mode waves with whistlers

Plasma emission (PE), i.e., electromagnetic radiation at the plasma frequency and its second harmonic, is a general process occurring in both astrophysical and laboratory plasmas. The prevailing theory presents a multi-stage process attributed to the resonant coupling of beam-excited Langmuir waves...

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Veröffentlicht in:Physics of plasmas 2021-04, Vol.28 (4)
Hauptverfasser: Ni, Sulan, Chen, Yao, Li, Chuanyang, Sun, Jicheng, Ning, Hao, Zhang, Zilong
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Chen, Yao
Li, Chuanyang
Sun, Jicheng
Ning, Hao
Zhang, Zilong
description Plasma emission (PE), i.e., electromagnetic radiation at the plasma frequency and its second harmonic, is a general process occurring in both astrophysical and laboratory plasmas. The prevailing theory presents a multi-stage process attributed to the resonant coupling of beam-excited Langmuir waves with ion-acoustic waves. Here, we examine another possibility of the fundamental PE induced by the resonant coupling of Z-mode and whistler (W) waves. Earlier studies have been controversial in the plausibility and significance of such process in plasmas. In this study, we show that the matching condition of three-wave resonant interaction (Z + W → O) can be satisfied over a wide regime of parameters based on the magnetoionic theory, demonstrate the occurrence of such process, and further evaluate the rate of energy conversion from the pumped Z or W mode to the fundamental O mode with particle-in-cell simulations of wave pumping. The study presents an alternative form of the fundamental PE, which could possibly play a role in various astrophysical and laboratory scenarios with both Z and W modes readily excited through the electron cyclotron maser instability.
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Acoustic waves
Coalescing
Coupling
Cyclotrons
Electromagnetic radiation
Emission
Energy conversion
Laboratories
Langmuir waves
Particle in cell technique
Plasma frequencies
Plasmas (physics)
Resonant interactions
Whistlers
title An alternative form of the fundamental plasma emission through the coalescence of Z-mode waves with whistlers
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