Local Excitation of Whistler Mode Waves and Associated Langmuir Waves at Dayside Reconnection Regions

Li, Jinxing; Bortnik, J.; An, Xin; Li, Wen; Russell, C. T.; Zhou, Meng; Berchem, J.; Zhao, Cong; Wang, Shan; Torbert, R. B.; Contel, O. Le; Ergun, R. E.; Lindqvist, Per‐Arne; Pollock, C. J.; Burch, J. L.

doi:10.1029/2018gl078287

Cited by 23 publications

(43 citation statements)

References 56 publications

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“…In this context, the paper by Drake et al (2015) should be mentioned. A more direct indication for the acceleration of electrons by wave‐particle interaction is seen in the chorus wave modulation of Langmuir waves (Li JX et al, 2017, 2018).…”

Section: Discussion and Summarymentioning

confidence: 99%

Gap formation around Ωe/2 and generation of low-band whistler waves by Landau-resonant electrons in the magnetosphere: Predictions from dispersion theory

Sauer¹,

Baumgärtel²,

Sydora³

2020

Earth and Planetary Physics

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In this paper we show that two significant phenomena of magnetospheric chorus emission can be explained by the participation of beam‐like electron structures, created by Landau‐resonant interaction with growing oblique whistler waves. The first concerns the widely observed spectral gap near half the electron cyclotron frequency Ω e; the second is related to the observation of very obliquely propagating lower‐band waves that cannot be directly generated by temperature anisotropy. Concerning the gap, kinetic dispersion theory reveals that interference of the beam‐related cyclotron mode ω~Ωe‐kVb with the conventional whistler mode leads to mode splitting and the appearance of a ‘forbidden’ area in the ω‐k space. Thereby the beam velocity V b appears as an essential parameter. It is directly related to the phase velocity of the most unstable whistler wave mode, which is close to V Ae/2 for sufficiently hot electrons (V Ae is the electron Alfven velocity). To clarify the second point, we show that Landau‐resonant beams with V b < V Ae/2, which arise in cold plasmas from unstable upper‐band waves, are able to generate lower‐band whistler mode waves at very oblique propagation (θ ≥ 60°). Our studies demonstrate the important role of Landau‐resonant electrons in nonlinear whistler wave generation in the magnetosphere.

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Section: Discussion and Summarymentioning

confidence: 99%

Gap formation around Ωe/2 and generation of low-band whistler waves by Landau-resonant electrons in the magnetosphere: Predictions from dispersion theory

Sauer¹,

Baumgärtel²,

Sydora³

2020

Earth and Planetary Physics

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“…In the Earth's magnetosphere, whistler mode waves can be generated by electron temperature anisotropy ( T ⊥ > T ∥ ) (Kennel & Petschek , ; Li et al, ) or electron beams (Ren et al, ; Sauer & Sydora, ). In this study, the whistler mode waves are generated by electron populations streaming on one side along the magnetic field and such a mechanism resembles the whistler heat flux instability (WHFI) (Kuzichev et al, ; Tong, Vasko, Marc, et al, ) observed in the solar wind.…”

Section: Discussion and Summarymentioning

confidence: 99%

Modulation of Whistler Mode Waves by Ion‐Scale Waves Observed in the Distant Magnetotail

Zhao

Parks

et al. 2020

JGR Space Physics

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Wave activities in tailward flows have been explored in the distant magnetotail at ~54 RE, where the coupling between whistler mode waves and ion‐scale waves was observed. The whistler mode waves periodically appeared at each cycle of the ion‐scale waves, and the electron distribution functions associated with the whistler mode waves showed enhancement in the direction parallel to background magnetic field. Wave analyses show that the field‐aligned electron components act as the energy source of the whistler mode waves. The ion‐scale waves are generated by the interaction of the hot ion beam with background ions. A likely candidate of the ion‐scale wave is the kinetic Alfven wave, which can generate the enhanced field‐aligned electron populations by the parallel electric field.

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“…However, the hiss‐driven Landau damping process can generate a field‐aligned population at Landau resonant energies rapidly, as shown in our case. The parallel acceleration produces a smaller PSD gradient in the parallel direction ( ∂f / ∂v ∥ ) or even a possible PSD plateau (e.g., Agapitov et al, ; An et al, ; Li et al, ; Min et al, ), which can significantly weaken or even eliminate further Landau damping ( W . Li et al, ; Ma et al, ).…”

Section: Discussionmentioning

confidence: 99%

Parallel Acceleration of Suprathermal Electrons Caused by Whistler‐Mode Hiss Waves

Bortnik

et al. 2019

Geophysical Research Letters

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Suprathermal electrons (~0.1–10 keV) in the inner magnetosphere are usually observed in a 90°‐peaked pitch angle distribution, formed due to the conservation of the first and second adiabatic invariants as they are transported from the plasma sheet. We report a peculiar field‐aligned suprathermal electron (FASE) distribution measured by Van Allen Probes, where parallel fluxes are 1 order of magnitude higher than perpendicular fluxes. Those FASEs are found to be closely correlated with large‐amplitude hiss waves and are observed around the Landau resonant energies. We demonstrate, using quasilinear diffusion simulations, that hiss waves can rapidly accelerate suprathermal electrons through Landau resonance and create the observed FASE population. The proposed mechanism potentially has broad implications for suprathermal electron dynamics as well as whistler mode waves in the Earth's magnetosphere and has been demonstrated in the Jovian magnetosphere.

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Local Excitation of Whistler Mode Waves and Associated Langmuir Waves at Dayside Reconnection Regions

Cited by 23 publications

References 56 publications

Gap formation around <em>Ω</em><sub>e</sub>/2 and generation of low-band whistler waves by Landau-resonant electrons in the magnetosphere: Predictions from dispersion theory

Gap formation around <em>Ω</em><sub>e</sub>/2 and generation of low-band whistler waves by Landau-resonant electrons in the magnetosphere: Predictions from dispersion theory

Modulation of Whistler Mode Waves by Ion‐Scale Waves Observed in the Distant Magnetotail

Parallel Acceleration of Suprathermal Electrons Caused by Whistler‐Mode Hiss Waves

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