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Nonlinear triggering process of whistler-mode emissions in a homogeneous magnetic field

Fujiwara, Yuya Nogi, Takeshi Omura, Yoshiharu 京都大学 DOI:10.1186/s40623-022-01646-x

2022

概要

We perform an electromagnetic particle simulation of triggered emissions in a uniform magnetic field for understanding of nonlinear wave–particle interaction in the vicinity of the magnetic equator. A finite length of a whistler-mode triggering wave packet with a constant frequency is injected by oscillating an external current at the equator. We find that the first subpacket of triggered emissions is generated in the homogeneous magnetic field. By analyzing resonant currents and resonant electron dynamics in the simulation, we find that the formation of an electron hole in a velocity phase space results in resonant currents, and the currents cause wave amplification and frequency increase. We obtain the interaction time of counter-streaming resonant electrons in a triggering wave packet with a finite width. By changing the duration time of the triggering pulse, we evaluate the interaction time necessary for formation of an electron hole. We conduct 4 runs with different duration times of the triggering pulse, 980, 230, 105, 40 Ωe⁻¹, which correspond to cases with interaction times, 370%, 86%, 39%, and 15% of the nonlinear trapping period, respectively. We find generation of triggered emissions in the three cases of 370%, 86%, and 39%, which agrees with the conventional nonlinear model that the nonlinear transition time, which is necessary for formation of resonant currents, is about a quarter of the nonlinear trapping period.

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Nonlinear triggering process of whistler-mode emissions in a homogeneous magnetic field

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関連論文

Nonlinear wave growth theory of whistler-mode chorus and hiss emissions in the magnetosphere

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Nonlinear Wave Growth of Whistler-Mode Hiss Emissions in a Uniform Magnetic Field

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Nonlinear triggering process of whistler-mode emissions in a homogeneous magnetic field

概要

この論文で使われている画像

関連論文

Nonlinear wave growth theory of whistler-mode chorus and hiss emissions in the magnetosphere

Simulation study on parametric dependence of whistler-mode hiss generation in the plasmasphere

Nonlinear Wave Growth of Whistler-Mode Hiss Emissions in a Uniform Magnetic Field

Significance of the Alfvén waves in the thermospheric dynamics in the cusp region

Observation of evanescent spin waves in the magnetic dipole regime

参考文献