Evaluation of a space-observed electric field structure for the ability to destabilize inhomogeneous energy-density-driven waves

Golovchanskaya, I. V.; Kozelov, B. V.; Мингалев, И. В.; Melnik, M. N.; Lubchich, A. A.

doi:10.5194/angeo-32-1-2014

Cited by 17 publications

(10 citation statements)

References 33 publications

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“…The fundamental frequency of the mode increased from 0.3 f ci to f ci (black line of Figure c), resulting a broad bandwidth wave. These results are consistent with satellite observations and other laboratory experiments and suggests that electrostatic BBELF waves can be generated by IEDDI driven by the coupling of the positive and negative energy density [ Thomas et al , ; Koepke et al , , ; Bonnell et al , ; Golovchanskaya et al , , ].…”

Section: Resultsmentioning

confidence: 99%

Laboratory generation of broadband ELF waves by inhomogeneous plasma flow

Liu

Lei

et al. 2017

Geophysical Research Letters

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Transversely accelerated ions and the associated heating of the high‐latitude ionosphere have been attributed to broadband extremely low frequency (BBELF) turbulence. Controlled laboratory tests of the hypotheses on the formation mechanism of BBELF waves have involved only a few examples, e.g., current‐driven and shear‐driven instabilities. In this work, electrostatic fluctuations in the ion cyclotron frequency range have been excited by inhomogeneous energy‐density‐driven instability (IEDDI). This was achieved using the interpenetrating plasma method with a much larger electric field scale size LE comparable to the ion gyroradius ρi, which was challenging earlier because of plasma conditions. The peak frequency of the IEDDI spectrum falls as low as ω≈0.3ωci, where ωci is ion cyclotron frequency. This is an interesting result because the previous attempts could not produce such low‐frequency IEDDI, although it was known theoretically to be possible. The observations made by FAST, Freja, and Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites might be explainable in terms of the reported experimental results.

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Section: Resultsmentioning

confidence: 99%

Laboratory generation of broadband ELF waves by inhomogeneous plasma flow

Liu

Lei

et al. 2017

Geophysical Research Letters

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“…17 Note that the IEDDI solutions exist in a wide range of s, whereas CDEIC solutions (current-driven electrostatic ion cyclotron instability) degenerate for s > 0.5. 6,18 Besides, the estimates of the parallel current made from in-situ data are typically far below the excitation threshold of the CDEIC instability. 37 As shown in the present work, the inhomogeneous energy density driven instability can explain the origin of these waves.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, data of the FAST satellite have been used for numerical analysis of the IEDDI. 18,19 Multilayer configurations were analyzed, as proposed in Ref. 20.…”

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confidence: 99%

“…It was confirmed that the BBELF waves can be identified as a type of ion-cyclotron waves excited by electrostatic ion instability, whose generation requires localized electric fields of the Alfve nic turbulence. 18,19 However, despite the fact that this theory has been actively developed in recent years, most attention has been concentrated on non-uniform localized electric fields. Little attention was paid to a comparison of numerical results based on experimental data and model approximations.…”

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confidence: 99%

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Inhomogeneities of plasma density and electric field as sources of electrostatic turbulence in the auroral region

et al. 2015

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Inhomogeneities of plasma density and non-uniform electric fields are compared as possible sources of a sort of electrostatic ion cyclotron waves that can be identified with broadband extremely low frequency electrostatic turbulence in the topside auroral ionosphere. Such waves are excited by inhomogeneous energy-density-driven instability. To gain a deeper insight in generation of these waves, computational modeling is performed with various plasma parameters. It is demonstrated that inhomogeneities of plasma density can give rise to this instability even in the absence of electric fields. By using both satellite-observed and model spatial distributions of plasma density and electric field in our modeling, we show that specific details of the spatial distributions are of minor importance for the wave generation. The solutions of the nonlocal inhomogeneous energy-density-driven dispersion relation are investigated for various ion-to-electron temperature ratios and directions of wave propagation. The relevance of the solutions to the observed spectra of broadband extremely low frequency emissions is shown.

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“…Subsequently, it was suggested that this instability leads to formation of the broadband electrostatic turbulence [Gavrishchaka et al, 1996;Kintner et al, 2000]. In the works [Golovchanskaya et al, 2014b;Ilyasov et al, 2015;Chernyshov et al, 2015Chernyshov et al, , 2016, numerical study of the IEDD instability was performed for electrostatic ion cyclotron modes using Freja and FAST satellite data. The results of these studies verified the suggestion that the broadband electrostatic turbulence can be identified with the nonlocal electrostatic ion cyclotron mode.…”

Section: Introductionmentioning

confidence: 99%

Influences of shear in the ion parallel drift velocity and of inhomogeneous perpendicular electric field on generation of oblique ion acoustic waves

et al. 2016

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It is well known that the broadband electrostatic turbulence observed in the topside auroral ionosphere can be identified with electrostatic ion cyclotron and/or oblique ion acoustic waves. Under certain conditions generation of the ion cyclotron modes is inhibited, so that the oblique ion acoustic waves become the prevailing part of the broadband noise. While generation of ion cyclotron waves by the inhomogeneous distribution of energy density (IEDD) instability has been actively studied in recent years, much less attention was paid to the excitation of ion acoustic waves by means of the IEDD instability. In this work, influence of shear in the ion parallel drift velocities and of inhomogeneous perpendicular electric field on generation of nonlocal oblique ion acoustic mode is studied. It is demonstrated that the shear of the ion parallel drift velocities can generate ion acoustic waves. It is shown that this mechanism of instability development provides broadband spectrum in the frequency range around 0.1 of ion gyrofrequency, and thus, this instability can be invoked to explain the observed broadband electrostatic turbulence in the auroral region. Effect of the main background plasma parameters on excitation of oblique ion acoustic waves is analyzed.

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Evaluation of a space-observed electric field structure for the ability to destabilize inhomogeneous energy-density-driven waves

Cited by 17 publications

References 33 publications

Laboratory generation of broadband ELF waves by inhomogeneous plasma flow

Laboratory generation of broadband ELF waves by inhomogeneous plasma flow

Inhomogeneities of plasma density and electric field as sources of electrostatic turbulence in the auroral region

Influences of shear in the ion parallel drift velocity and of inhomogeneous perpendicular electric field on generation of oblique ion acoustic waves

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