Generation of Lower Harmonic Magnetosonic Waves Through Nonlinear Wave‐Wave Interactions

Gao, Xinliang; Sun, Jicheng; Lu, Quanming; Chen, Lunjin; Wang, Shui

doi:10.1029/2018gl079090

Cited by 15 publications

(20 citation statements)

References 26 publications

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“…One discrepancy is the presence of a weak second harmonic in the simulation, which is not unstable according to the linear theory. The formation of the relatively weak second harmonics may be caused by the nonlinear wave‐wave coupling (Chen et al, ; Gao et al, ). Based on the diagnosis of wave properties and the comparison with the linear theory, it is safe to conclude that the excited fluctuating electromagnetic fields in our simulations are indeed magnetosonic wave mode generated by the proton ring distribution.…”

Section: Simulation Resultsmentioning

confidence: 99%

Two‐Dimensional Particle‐in‐Cell Simulation of Magnetosonic Wave Excitation in a Dipole Magnetic Field

Chen

Sun

et al. 2018

Geophysical Research Letters

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The excitation of magnetosonic waves in the meridian plane of a rescaled dipole magnetic field is investigated, for the first time, using a general curvilinear particle‐in‐cell simulation. Our simulation demonstrates that the magnetosonic waves are excited near the equatorial plane by tenuous ring distribution protons. The waves propagate nearly perpendicularly to the background magnetic field along both radially inward and outward directions. Different speeds of inward and outward propagation result in the asymmetrical distribution about the source region. The waves are accompanied by energization of both cool protons and electrons near the wave source region. The cool protons are heated perpendicularly, while the cool electrons can be heated in the parallel direction and also experience enhanced perpendicular drift at the presence of intense wave power. The implications of simulation results to the observations of magnetosonic waves and related particle heating in the inner magnetosphere are also discussed.

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Section: Simulation Resultsmentioning

confidence: 99%

Two‐Dimensional Particle‐in‐Cell Simulation of Magnetosonic Wave Excitation in a Dipole Magnetic Field

Chen

Sun

et al. 2018

Geophysical Research Letters

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“…The PIC simulation model is a powerful tool to investigate the plasma process via a self-consistent way (Sun et al 2016(Sun et al , 2017Lu et al 2016;Ke et al 2017;Gao et al 2018;Chen et al 2018). In this paper, a 1-D PIC simulation is used to study the expansion of hot electrons in a magnetic mirror field.…”

Section: Simulation Modelmentioning

confidence: 99%

Expansion of Solar Coronal Hot Electrons in an Inhomogeneous Magnetic Field: 1D PIC Simulation

Sun

Gao

et al. 2019

ApJ

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The expansion of hot electrons in flaring magnetic loops is crucial to understanding the dynamics of solar flares. In this paper we investigate, for the first time, the transport of hot electrons in a magnetic mirror field based on a 1-D particlein-cell (PIC) simulation. The hot electrons with small pitch angle transport into the cold plasma, which leads to the generation of Langmuir waves in the cold plasma and ion acoustic waves in the hot plasma. The large pitch angle electrons can be confined by the magnetic mirror, resulting in the different evolution time scale between electron parallel and perpendicular temperature. This will cause the formation of electron temperature anisotropy, which can generate the whistler waves near the interface between hot electrons and cold electrons. The whistler waves can scatter the large pitch angle electrons to smaller value through the cyclotron resonance, leading to electrons escaping from the hot region. These results indicate that the whistler waves may play an important role in the transport of electrons in flaring magnetic loops. The findings from this study provide some new insights to understand the electron dynamics of solar flares.3

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“…The results of another 1-D PIC simulations by Gao et al (2018) showed that initial growth of EMWs, driven by an unstable proton ring distribution, occurred at harmonics in the range 9-12 Ω p . Later in the simulation, emissions at lower harmonics were observed.…”

Section: Introductionmentioning

confidence: 98%

Equatorial Magnetosonic Waves: Do Nonlinear Interactions Play a Role in Their Evolution?

et al. 2020

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The occurrence of nonlinear interactions between discrete wave frequencies has been shown to play a significant role in the propagation and evolution of some plasma wave modes. In this paper we take advantage of closely spaced Cluster measurements to investigate the possibility nonlinear interactions occurring between the discrete emissions that are observed in a region of Equatorial Magnetosonic Wave generation. Based on transfer function analysis, it is shown that the role of nonlinear interactions plays a negligible role in the wave evolution as the emissions propagate from one satellite to the other. A bicoherence analysis of the individual signals also fails to find the existence of nonlinear interactions in the evolution of equatorial magnetosonic waves. Plain Language SummaryIn space plasmas, oscillations in the background electric and magnetic fields grow from energy sources associated with populations of plasma particles that are not in equilibrium. Once generated, these plasma waves may interact with the background plasma passing their energy back to the particles. In addition, waves at different frequencies may interact with each other, passing some of their energy to waves at a third frequency. There interactions may affect the evolution of these waves as they propagate in space. In this study, we examine a specific type of plasma wave, namely, equatorial magnetosonic waves, that exist as a set of harmonic frequencies related to the gyration of a proton in a magnetic field, looking for evidence of so called wave-wave interactions in a region. No evidence is found for such interactions. Thus, it appears that these waves will evolve by exchanging energy with plasma particles but not plasma waves.

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Generation of Lower Harmonic Magnetosonic Waves Through Nonlinear Wave‐Wave Interactions

Cited by 15 publications

References 26 publications

Two‐Dimensional Particle‐in‐Cell Simulation of Magnetosonic Wave Excitation in a Dipole Magnetic Field

Two‐Dimensional Particle‐in‐Cell Simulation of Magnetosonic Wave Excitation in a Dipole Magnetic Field

Expansion of Solar Coronal Hot Electrons in an Inhomogeneous Magnetic Field: 1D PIC Simulation

Equatorial Magnetosonic Waves: Do Nonlinear Interactions Play a Role in Their Evolution?

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