Dissipation of strong Langmuir turbulence in nonisothermal non-Maxwellian plasma

Vyacheslavov, L. N.; Burmasov, V. S.; Kandaurov, I. V.; Kruglyakov, Eduard P.; Meshkov, O.; Sanin, A.

doi:10.1134/1.1463114

Cited by 21 publications

(5 citation statements)

References 27 publications

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“…The supersonic MI, which is popularly known as the oscillating two stream instability (OTSI) [ Papadopoulos et al , 1974; Smith et al , 1979; Goldstein et al , 1979] and, soliton formation and Langmuir collapse [ Zakharov , 1972; Nicholson et al , 1978; Goldman , 1983] are suggested as the most effective beam stabilization mechanisms. These strong Langmuir turbulence processes are the focus of several theoretical studies [ Zakharov , 1972; Goldman , 1984; Robinson , 1997], computer simulations [ Bardwell and Goldman , 1976; Nicholson et al , 1978; Degtyarev et al , 1980; Doolen et al , 1985; Russell et al , 1988] and experimental investigations [ Whelan and Stenzel , 1981; Michel et al , 1982; Wong and Cheung , 1984; Cheung and Wong , 1985a, 1985b; McFarland and Wong , 1997, 2001; Vyacheslavov et al , 2002] because of the fundamental nature of the problem [ Zakharov , 1972; Krasnoselskikh and Sotnikov , 1977], and practical importance in fields, such as the laser heating of pellets [ Montgomery et al , 1999], ionospheric modification experiments [ DuBois et al , 1993], and several astrophysical applications [ Galeev and Krasnoselskikh , 1976, 1978; Gurnett et al , 1981; Pelletier et al , 1988; Balikhin et al , 1989; Kellogg et al , 1999].…”

Section: Introductionmentioning

confidence: 99%

In situ detection of strong Langmuir turbulence processes in solar type III radio bursts

Thejappa¹,

MacDowall²,

Bergamo³

2012

J. Geophys. Res.

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[1] The high time resolution observations obtained by the WAVES experiment of the STEREO spacecraft in solar type III radio bursts show that Langmuir waves often occur as intense localized wave packets. These wave packets are characterized by short durations of only a few ms and peak intensities, which well exceed the supersonic modulational instability (MI) thresholds. These timescales and peak intensities satisfy the criterion of the solitons collapsed to spatial scales of a few hundred Debye lengths. The spectra of these wave packets consist of primary spectral peaks corresponding to beam-resonant Langmuir waves, two or more sidebands corresponding to down-shifted and up-shifted daughter Langmuir waves, and low frequency enhancements below a few hundred Hz corresponding to daughter ion sound waves. The frequencies and wave numbers of these spectral components satisfy the resonance conditions of the modulational instability (MI). Moreover, the tricoherences, computed using trispectral analysis techniques show that these spectral components are coupled to each other with a high degree of coherency as expected of the MI type of four wave interactions. The high intensities, short scale lengths, sideband spectral structures and low frequency spectral enhancements and, high levels of tricoherences amongst the spectral components of these wave packets provide unambiguous evidence for the supersonic MI and related strong turbulence processes in type III radio bursts. The implication of these observations include: (1) the MI and related strong turbulence processes often occur in type III source regions, (2) the strong turbulence processes probably play very important roles in beam stabilization as well as conversion of Langmuir waves into escaping radiation at the fundamental and second harmonic of the electron plasma frequency, f pe , and (3) the Langmuir collapse probably follows the route of MI in type III radio bursts.Citation: Thejappa, G., R. J. MacDowall, and M. Bergamo (2012), In situ detection of strong Langmuir turbulence processes in solar type III radio bursts,

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Section: Introductionmentioning

confidence: 99%

In situ detection of strong Langmuir turbulence processes in solar type III radio bursts

Thejappa¹,

MacDowall²,

Bergamo³

2012

J. Geophys. Res.

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“…The strong turbulence theory ignores the wave-particle effect, and is a macroscopic theory. Even though Zakharov's strong turbulence theory continues to be investigated by many researchers (see the reviews by Goldman 1984 andRobinson 1997), the theory remains controversial to this date, and various numerical simulations and experiments to confirm the theory are inconclusive (Robinson and Newman 1990;Vyacheslavov et al 2002;Erofeev 2002). …”

Section: A Brief History Of Langmuir Turbulencementioning

confidence: 99%

Langmuir Turbulence and Suprathermal Electrons

et al. 2012

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Charged particle acceleration takes place ubiquitously in the Universe including the near-Earth heliospheric environment. Typical in situ spacecraft measurements made in the solar wind show that the charged particle velocity distribution contains energetic components with quasi scale-free power-law velocity dependence, f ∼ v −α , for high velocity range. In this Review a theory of quiet-time solar-wind electrons that contain a suprathermal component is discussed, in which these electrons are taken to be in dynamical equilibrium with Langmuir turbulence. This Review includes an overview of the Langmuir turbulence theory, as well as a discussion on asymptotic equilibrium solution of Langmuir turbulence/suprathermal electron system. Theoretical predictions of high-energy electron velocity power-law distribution index is then compared against the recent observations of the superhalo electron velocity distribution made by instruments onboard WIND and STEREO spacecraft. It is shown that the theoretical prediction of velocity power-law index is intermediate to the observed range.

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“…11 The concept of turbulence spectra and energy flux distributed with respect to the spectra is fundamental. The wide-ranging interest in the turbulence spectra is not only motivated by the desire to gain a deeper understanding of SLT, but also because the spectra of the plasmons are believed to play a role in the turbulence acceleration by strong Langmuir plasmons.…”

Section: Plasmon Turbulence Spectra With the Filamentation Patterns Imentioning

confidence: 99%

Plasmon turbulence spectra with the filamentation patterns in a laser plasma

Liu

Yang³

2008

Physics of Plasmas

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The instantaneous spectra of the transverse, Langmuir, and ion-sound plasmons near the critical surface in a laser-plasma are numerically obtained from the complete Zakharov equations under the condition of the nonstatic limit. They are used to discuss the filamentation process in the strong Langmuir turbulence. From the turbulence spectra, the energy flux flow from small k space to large k space can be identified. The higher incident laser intensity associated with a quicker filamentation process can also be identified.

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Dissipation of strong Langmuir turbulence in nonisothermal non-Maxwellian plasma

Cited by 21 publications

References 27 publications

In situ detection of strong Langmuir turbulence processes in solar type III radio bursts

In situ detection of strong Langmuir turbulence processes in solar type III radio bursts

Langmuir Turbulence and Suprathermal Electrons

Plasmon turbulence spectra with the filamentation patterns in a laser plasma

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