Excitation of Chirping Whistler Waves in a Laboratory Plasma

Compernolle, B. Van; An, Xin; Bortnik, J.; Thorne, R. M.; Pribyl, Patrick; Gekelman, Walter

doi:10.1103/physrevlett.114.245002

Cited by 58 publications

(43 citation statements)

References 40 publications

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“…In a beam‐plasma system, various instability processes can excite a variety of waves including whistler mode waves [ Bell and Buneman , ], Bernstein‐mode waves [ Kusse and Bers , ; Mizuno et al , ], and Langmuir waves [ O'Neil et al , ; Gentle and Lohr , ]. Whistler mode emissions by beam‐plasma interaction have been studied extensively in the past, such as in the generation of auroral hiss [ Maggs , ; Gurnett et al , ; Sazhin et al , ], in active experiments in the space environment [ Lavergnat and Pellat , ; Tokar et al , ; Gurnett et al , ; Farrell et al , ; Neubert and Banks , ], and in controlled laboratory settings [ Stenzel , ; Krafft et al , ; Starodubtsev and Krafft , ; Starodubtsev et al , ; Van Compernolle et al , ]. During active experiments of the Spacelab 2 mission, for instance, beam‐generated whistler mode emissions were observed to propagate near the resonance cone and were attributed to Landau resonance [ Gurnett et al , ; Farrell et al , ].…”

Section: Introductionmentioning

confidence: 99%

Resonant excitation of whistler waves by a helical electron beam

Compernolle

Bortnik

et al. 2016

Geophysical Research Letters

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Chorus‐like whistler mode waves that are known to play a fundamental role in driving radiation belt dynamics are excited on the Large Plasma Device by the injection of a helical electron beam into a cold plasma. The mode structure of the excited whistler wave is identified using a phase correlation technique showing that the waves are excited through a combination of Landau resonance, cyclotron resonance, and anomalous cyclotron resonance. The dominant wave mode excited through cyclotron resonance is quasi‐parallel propagating, whereas wave modes excited through Landau resonance and anomalous cyclotron resonance propagate at oblique angles that are close to the resonance cone. An analysis of the linear wave growth rates captures the major observations in the experiment. The results have important implications for the generation process of whistler waves in the Earth's inner magnetosphere.

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Section: Introductionmentioning

confidence: 99%

Resonant excitation of whistler waves by a helical electron beam

Compernolle

Bortnik

et al. 2016

Geophysical Research Letters

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“…We have shown results from a recent laboratory experiment in which whistler waves were excited by a population of energetic electrons with finite pitch angle [1]. Both discrete frequency chirping whistler waves and broadband whistler waves were observed.…”

Section: Discussionmentioning

confidence: 98%

“…In a different parameter scan [1] the plasma density was held constant at ω pe /Ω e = 3.2 but the beam density was changed from 0.1 % to more than 1%. In this case the growth rate increases with n b /n 0 which was reflected in the observed wave amplitudes.…”

Section: Resultsmentioning

confidence: 99%

“…Previous attempts to remotely excite artificial whistler waves have been made in the Earth's near-space environment and have yielded interesting results [10,11], but have been difficult to probe and control. Recently, we reported on an experimental arrangement using an energetic electron beam to excite both discrete frequency chirping whistler waves and broadband whistler waves [1].…”

Section: Introductionmentioning

confidence: 99%

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Electron beam generated whistler emissions in a laboratory plasma

Compernolle¹,

An²,

Bortnik³

et al. 2015

AIP Conference Proceedings

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“…A series of controlled laboratory experiments [27][28][29] were performed to study the excitation of whistler waves in the Large Plasma Device 30 at University of California, Los Angeles (UCLA). In the experiments, both electrostatic and whistler waves were excited by the injection of a gyrating electron beam into a cold plasma.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic and whistler instabilities excited by an electron beam

Bortnik

Compernolle

et al. 2017

Physics of Plasmas

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The electron beam-plasma system is ubiquitous in the space plasma environment.Here, using a Darwin particle-in-cell method, the excitation of electrostatic and whistler instabilities by a gyrating electron beam is studied in support of recent laboratory experiments. It is assumed that the total plasma frequency ω pe is larger than the electron cyclotron frequency Ω e . The fast-growing electrostatic beam-mode waves saturate in a few plasma oscillations by slowing down and relaxing the electron beam parallel to the background magnetic field. Upon their saturation, the finite amplitude electrostatic beam-mode waves can resonate with the tail of the background thermal electrons and accelerate them to the beam parallel velocity. The slowergrowing whistler waves are excited in primarily two resonance modes: (a) through Landau resonance due to the inverted slope of the beam electrons in the parallel velocity; (b) through cyclotron resonance by scattering electrons to both lower pitch angles and smaller energies. It is demonstrated that, for a field-aligned beam, the whistler instability can be suppressed by the electrostatic instability due to a faster energy transfer rate between beam electrons and the electrostatic waves. Such a competition of growth between whistler and electrostatic waves depends on the ratio of ω pe /Ω e . In terms of wave propagation, beam-generated electrostatic waves are confined to the beam region whereas beam-generated whistler waves transport energy away from the beam. a) xinan@atmos.ucla.edu 1 arXiv:1707.05346v1 [physics.plasm-ph]

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Excitation of Chirping Whistler Waves in a Laboratory Plasma

Cited by 58 publications

References 40 publications

Resonant excitation of whistler waves by a helical electron beam

Resonant excitation of whistler waves by a helical electron beam

Electron beam generated whistler emissions in a laboratory plasma

Electrostatic and whistler instabilities excited by an electron beam

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