Nonlinear effects associated with quasi‐electrostatic whistler waves relevant to that in radiation belts

Goyal, Rajan; Sharma, R. P.; Kumar, Sanjay

doi:10.1002/2016ja023274

Cited by 8 publications

(3 citation statements)

References 49 publications

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“…The quasi‐field aligned wave normal angle assumption is consistent with the observation in Figure 2c. Oblique chorus waves have been observed in the previous studies (e.g., Li et al., 2016), and their precipitation effects (Goyal et al., 2017, 2018) and the subsequent MIA energy interplay will be an interesting future study.…”

Section: Stet Code Settingmentioning

confidence: 72%

Simulating Electron Distribution Function in the Pulsating Aurora Using Particle and Wave Data of ARASE Satellite

Khazanov,

Ma,

Chu

2023

JGR Space Physics

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Decades lasting research on the pulsating aurora suggested that this phenomenon forms as result of interactions between the magnetospheric keVs electrons and whistler‐mode chorus waves. Arase satellite observation reported the direct evidence for this process confirming in situ measurement of highly correlated precipitated electrons and chorus wave activity. This paper presents the theoretical analysis of this observational event based on the SuperThermal Electron Transport (STET) code that simulates the highly dynamic environment of measured waves and particle data. Specifically, the STET code simulated results confirms the delicate loss‐cone observation results of this mission and further reveals the broader energy range of precipitated electron fluxes that was not measurable by Arase satellite.

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Section: Stet Code Settingmentioning

confidence: 72%

Simulating Electron Distribution Function in the Pulsating Aurora Using Particle and Wave Data of ARASE Satellite

Khazanov,

Ma,

Chu

2023

JGR Space Physics

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“…Previous studies have also shown abundant large amplitude oblique whistler-mode waves with wave normal angles close to the resonance cone angle (e.g., Cattell et al, 2008;Li et al, 2016). The nonlinear effects for these quasi-electrostatic whistler-mode waves can be very different from parallel waves (Artemyev et al, 2013;Goyal et al, 2017;Goyal et al, 2018;Zhang et al, 2022a) and further investigation is needed to fully understand their roles in electron precipitation.…”

Section: Discussionmentioning

confidence: 98%

Electron precipitation caused by intense whistler-mode waves: combined effects of anomalous scattering and phase bunching

Gan,

Li,

Hanzelka

et al. 2023

Front. Astron. Space Sci.

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Resonant interactions with whistler-mode waves are a crucial mechanism that drives the precipitation of energetic electrons. Using test particle simulations, we investigated the impact of nonlinear interactions of whistler-mode waves on electron precipitation across a broad energy range (10 keV- 1 MeV). Specifically, we focused on the combined effects of conventional phase bunching and anomalous scattering, which includes anomalous trapping and positive bunching. It is shown that anomalous scattering transports electrons away from the loss cone and the only process directly causing precipitation in the nonlinear regime is the phase bunching. We further show that their combined effects result in a precipitation-to-trapped flux ratio lower than the quasilinear expectations in a quasi-equilibrium state. Additionally, we calculated the diffusion and advection coefficients associated with the nonlinear trapping and bunching processes, which are vital for understanding the underlying mechanisms of the precipitation. Based on these coefficients, we characterized the phase bunching boundary, representing the innermost pitch angle boundary where phase bunching can occur. A further analysis revealed that electrons just outside this boundary, rather than near the loss cone, are directly precipitated, while electrons within the boundary are prevented from precipitation due to anomalous scattering. Moreover, we demonstrated that the regime of dominant nonlinear precipitation is determined by the combination of the phase bunching boundary and the inhomogeneity ratio. This comprehensive analysis provides insights into the nonlinear effects of whistler-mode waves on electron precipitation, which are essential for understanding physical processes related to precipitation, such as microbursts, characterized by intense and bursty electron precipitation.

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“…Chorus subpackets consist of wave packets characterized by modulated amplitudes, typically within a timescale of ∼10–100 milliseconds in the Earth's magnetosphere (Goyal et al., 2017; Mourenas et al., 2022; Santolík et al., 2003; Tsurutani et al., 2009; Zhang et al., 2020). They are also observed in the magnetospheres of other planets (Menietti et al., 2012; Reinleitner et al., 1984), as well as in laboratory plasma (Van Compernolle et al., 2016).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Electron Trapping Through Cyclotron Resonance in the Formation of Chorus Subpackets

Chen,

Wang,

Chen

et al. 2024

Geophysical Research Letters

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Chorus subpackets are the wave packets with modulated amplitudes in chorus waves, commonly observed in the magnetospheres of Earth and other planets. Nonlinear wave‐particle interactions have been suggested to play an important role in subpacket formation, yet the corresponding electron dynamics remain not fully understood. In this study, we have investigated the electron trapping through cyclotron resonance with subpackets, using a self‐consistent general curvilinear plasma simulation code simulation model in dipole fields. The electron trapping period has been quantified separately through electron dynamic analysis and theoretical derivation. Both methods indicate that the electron trapping period is shorter than the subpacket period/duration. We have further established the relation between electron trapping period and subpacket period through statistical analysis using simulation and observational data. Our study demonstrates that the nonlinear electron trapping through cyclotron resonance is the dominant mechanism responsible for subpacket formation.

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Nonlinear effects associated with quasi‐electrostatic whistler waves relevant to that in radiation belts

Cited by 8 publications

References 49 publications

Simulating Electron Distribution Function in the Pulsating Aurora Using Particle and Wave Data of ARASE Satellite

Simulating Electron Distribution Function in the Pulsating Aurora Using Particle and Wave Data of ARASE Satellite

Electron precipitation caused by intense whistler-mode waves: combined effects of anomalous scattering and phase bunching

Nonlinear Electron Trapping Through Cyclotron Resonance in the Formation of Chorus Subpackets

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