Broadband Instability of the Whistler Band in a Magnetized Plasma Density Depletion with a Parallel Current

Zudin, I. Yu.; Gushchin, M. E.; Aidakina, N. A.; Korobkov, S. V.; Strikovskiy, A. V.

doi:10.1134/s0021364021020119

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…It has been convincingly shown that density depletions can duct Gendrin‐mode whistlers effectively (see Zaboronkova et al., 1992 and references therein). However, the results that led to this conclusion were obtained with whistlers generated by plasma instabilities (Zudin et al., 2021) or compact antennas (Kostrov et al., 1998) located inside the density depletion. This geometry is typical for a laboratory experiment, and can be used in some ionospheric experiments with powerful satellite‐borne VLF transmitters (Armand et al., 1988; McCollough et al., 2022; Sonwalkar et al., 1994).…”

Section: Discussionmentioning

confidence: 99%

Properties of Whistler Waves’ Ducting in Plasmas With Systems of Small‐Scale Density Depletions

Zudin,

Zaboronkova,

Gushchin

et al. 2023

JGR Space Physics

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The ducting of whistler waves by systems of small‐scale field‐aligned plasma density depletions is studied. Similarly to our previous paper (Zudin et al., 2019), we carry out analytical calculations and numerical simulations for the parameters of an active experiment in which very low frequency (VLF) whistler waves emitted by a ground‐based transmitter at a frequency of 18 kHz were received onboard the DEMETER satellite at 700 km above the SURA heating facility. Random‐sized density depletions with a level around 10 − 20% and perpendicular sizes ranging from 10 m up to about 300 m are considered. The properties of ducted waves are determined by the perpendicular size of individual depletions. Particularly, depletions with a width of more then d0 ∼ 100 m form separate ducting structures, i.e. coupled waveguides capable of exchanging energy by means of mode overlap. Depletions with a width of less than d0 ∼ 100 m form a common waveguide structure, whose properties are equivalent to those of a wider irregularity with a smoothed density profile. Two important differences are revealed in ducting properties of density depletions compared to density enhancements considered in (Zudin et al., 2019). First, depletions support highly oblique Gendrin mode waves, rather than quasi‐longitudinal whistlers as in the case of density enhancements. Second, the characteristic perpendicular size d0 ∼ 100 m of density depletions separating the regimes of “coupled waveguides’ and of “equivalent ducting structure’ with smoothed density profile is by an order of magnitude smaller than for density enhancements of the same 10 − 20% relative level.This article is protected by copyright. All rights reserved.

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Section: Discussionmentioning

confidence: 99%

Properties of Whistler Waves’ Ducting in Plasmas With Systems of Small‐Scale Density Depletions

Zudin,

Zaboronkova,

Gushchin

et al. 2023

JGR Space Physics

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Kinetic whistler instability in a mirror-confined plasma of a continuous ECR ion source

et al. 2023

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Kinetic instabilities in a dense plasma of a continuous electron cyclotron resonance (ECR) discharge in a mirror magnetic trap at the Gasdynamic Ion Source for Multipurpose Operation (GISMO) setup are studied. We experimentally define unstable regimes and corresponding plasma parameters, where the excitation of electromagnetic emission is observed, accompanied by the precipitation of energetic electrons from the magnetic trap. A comprehensive experimental study of the precipitating electron energy distribution and plasma electromagnetic emission spectra, together with theoretical estimates of the cyclotron instability increment proves that under the experimental conditions, the observed instability is related to the excitation of whistler-mode waves, which are a driver of losses of energetic electrons from the magnetic trap. The results of this study are important for the further development of the GISMO electron cyclotron resonance ion source facility and for the improvement of its parameters as an ion source. Also, this research on plasma kinetic instabilities is of fundamental interest and provides experimental tools to simultaneously study plasma electromagnetic activity and corresponding changes in a resonant electron energy distribution.

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Features of the Dynamic Spectrum of Signals Generated by a Wide-Aperture Electron Beam in a Large-Scale Magnetized Plasma

Zudin,

Gushchin,

Strikovskiy

et al. 2024

Jetp Lett.

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Electromagnetic signals generated by a wide-aperture electron beam in the laboratory plasma under conditions limitedly modeling the interaction between waves and particles in the near-Earth plasma have been studied at the large-scale Krot device. The spectrum of electromagnetic radiation includes whistler noise, which is presumably due to the current instability, and discrete (narrowband) signals near harmonics of the electron cyclotron and plasma frequencies. It has been shown that narrowband signals with a positive frequency drift that are observed at the injection of the electron beam are caused by nonstationary variations of the plasma density due to an additional ionization of a neutral gas by accelerated electrons. These effects should be taken into account to interpret nonconventional forms of the dynamic spectrum in various laboratory experiments simulating processes in the Earth’s ionosphere and magnetosphere.

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Broadband Instability of the Whistler Band in a Magnetized Plasma Density Depletion with a Parallel Current

Cited by 3 publications

References 13 publications

Properties of Whistler Waves’ Ducting in Plasmas With Systems of Small‐Scale Density Depletions

Properties of Whistler Waves’ Ducting in Plasmas With Systems of Small‐Scale Density Depletions

Kinetic whistler instability in a mirror-confined plasma of a continuous ECR ion source

Features of the Dynamic Spectrum of Signals Generated by a Wide-Aperture Electron Beam in a Large-Scale Magnetized Plasma

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