Spectra of langmuir waves in a magnetized plasma with low-frequency turbulence

Burinskaya, T. M.; Rauch, Jean-Louis; Mogilevskii, M. M.

doi:10.1134/1.1800220

Cited by 5 publications

(8 citation statements)

References 8 publications

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“…Moreover, Graham & Cairns (2013) show that around 40% of the Langmuir waveforms observed by STEREO during type III solar radio bursts can be consistent with the occurrence of such decays, and even with one or more of their cascades. It is interesting to note here that the Langmuir wave profiles and spectra obtained using the INTERBALL-2 satelliteʼs data (Burinskaya et al 2004) in the inner regions of the Earthʼs magnetosphere are very similar to those observed in the solar wind type III regions or the foreshock; the explanation proposed by the authors is based on the weak turbulence theory of beam-excited Langmuir waves' scattering on the external IS turbulence.…”

Section: Introductionsupporting

confidence: 72%

Langmuir Wave Decay in Inhomogeneous Solar Wind Plasmas: Simulation Results

Krafft

Volokitin

Krasnoselskikh

2015

ApJ

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Langmuir turbulence excited by electron flows in solar wind plasmas is studied on the basis of numerical simulations. In particular, nonlinear wave decay processes involving ion-sound (IS) waves are consideredin order to understand their dependence on external long-wavelength plasma density fluctuations. In the presence of inhomogeneities, it is shown that the decay processes are localized in space and, due to the differences between the group velocities of Langmuir and IS waves, their duration is limitedso that a full nonlinear saturation cannot be achieved. The reflection and the scattering of Langmuir wave packets on the ambient and randomly varying density fluctuations lead to crucial effects impacting the development of the IS wave spectrum. Notably, beatings between forward propagating Langmuir waves and reflected ones result in the parametric generation of waves of noticeable amplitudes and in the amplification of IS waves. These processes, repeated at different space locations, form a series of cascades of wave energy transfer, similar to those studied in the frame of weak turbulence theory. The dynamics of such a cascading mechanism and its influence on the acceleration of the most energetic part of the electron beam are studied. Finally, the role of the decay processes in the shaping of the profiles of the Langmuir wave packets is discussed, and the waveforms calculated are compared with those observed recently on board the spacecraft Solar TErrestrial RElations Observatory and WIND.

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Section: Introductionsupporting

confidence: 72%

Langmuir Wave Decay in Inhomogeneous Solar Wind Plasmas: Simulation Results

Krafft

Volokitin

Krasnoselskikh

2015

ApJ

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“…However, this limit implicitly imposes some restrictions on the initial conditions, and these need not always apply. The model for the nonlinear shift in plasma frequency 1 2 ω pe η(0) becomes particularly simple in this quasi static limit by relating η(0) to F by using (13) for |∇φ| 2 , giving…”

Section: Quasi Stationary Conditionsmentioning

confidence: 99%

“…The nonlinear evolution of high frequency electron plasma waves have been studied in great detail in part because these waves are often found in nature [1][2][3][4][5]. They are easily excited also in a laboratory.…”

Section: Introductionmentioning

confidence: 99%

“…(For laboratory conditions it might become difficult to fulfill this condition due to the finite size of the apparatus.) Nonlinearities associated with, for instance, the adiabatic electron motion will be of the order of (λ D /λ) 2 and can be ignored [8], assuming again that the Debye length λ D is much smaller than any relevant wavelength. The origin of the dominating nonlinear term is here the space-time varying density in the electron continuity equation.…”

Section: Introductionmentioning

confidence: 99%

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Stability of electron wave spectra in weakly magnetized plasmas

Kono

Pécseli

2017

J. Plasma Phys.

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Analytical models for nonlinear electron plasma waves in weakly magnetized plasmas are developed for single as well as multi-mode conditions, with continuous wave spectra being a limiting case. The conditions for wave decay as well as modulational instabilities are analysed. Our results demonstrate that slow or nearly stationary plasma density variations can be found for weakly magnetized plasmas even for weakly nonlinear electron plasma waves without involving cavitation of large amplitude plasma waves. A reduction of the growth rates for decay as well as modulational instabilities are found when the spectral width of the wave spectrum is increased. Some of our results are relevant for the interpretation of the nonlinearly enhanced ion acoustic lines often observed in non-equilibrium ionospheres.

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“…The nonlinear Schröinger's equation (NLSE) in its dimensionless form has important applications in Plasma Physics [1][2][3][4][5][6][7][8][9][10]. It describes the electron (Langmuir) waves [2,9].…”

Section: Introductionmentioning

confidence: 99%