Harmonic Langmuir waves. III. Vlasov simulation

Umeda, Takayuki; Omura, Yoshiharu; Yoon, Peter H.; Gaelzer, R.; Matsumoto, H.

doi:10.1063/1.1537240

Cited by 58 publications

(34 citation statements)

References 53 publications

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“…The full details of the simulation technique and the in-depth analysis of the results are the focus of the paper by Umeda et al (2003). The simulation result shown in Fig.…”

Section: Nonlinear Dispersion Relation For Harmonic Langmuir Modesmentioning

confidence: 99%

“…Recently, however, a theory of harmonic generation in turbulent plasmas was developed by the author and his colleagues (Yoon, 2000;Gaelzer et al, 2002Gaelzer et al, , 2003Yoon et al, 2003;Umeda et al, 2003), in which these modes are considered as eigenmodes of nonlinear plasma system. This approach was prompted by recent simulations (Schriver et al, 2000;Kasaba et al, 2001) which show that harmonic modes persist even in late nonlinear phase when the coherent phase space structure is no longer apparent, and when the plasma has entered a stage which can be genuinely characterized by random-phases.…”

Section: Harmonic Langmuir Modesmentioning

confidence: 99%

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Formation of quasi-power law weak Langmuir turbulence spectrum by harmonic generation

Yoon

2004

Nonlin. Processes Geophys.

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Abstract. Langmuir wave turbulence generated by a beamplasma interaction has been studied since the early days of plasma physics research. Despite a long history of investigation on this subject, among the outstanding issues is the generation of harmonic Langmuir waves observed in both laboratory and computer-simulated experiments. However, the phenomenon has not been adequately explained in terms of theory, nor has it been fully characterized by means of numerical simulations. In this paper, a theory of harmonic Langmuir wave generation is put forth and tested against the Vlasov simulation results. It is found that the harmonic Langmuir mode spectra exhibit quasi power-law feature implying a multi-scale structure in both frequency and wave number space spanning several orders of magnitude.

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“…The full details of the simulation technique and the in-depth analysis of the results are the focus of the paper by Umeda et al (2003). The simulation result shown in Fig.…”

Section: Nonlinear Dispersion Relation For Harmonic Langmuir Modesmentioning

confidence: 99%

Section: Harmonic Langmuir Modesmentioning

confidence: 99%

Formation of quasi-power law weak Langmuir turbulence spectrum by harmonic generation

Yoon

2004

Nonlin. Processes Geophys.

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“…The work of Yoon et al (2003) was supplemented by numerical Vlasov simulations made by Umeda et al (2003) which were used to make a concrete comparison with the theoretical dispersion curves. Gaelzer et al (2003) formulated and numerically solved the theoretical wave and particle kinetic equations.…”

Section: Other Neial Signatures Related To Large-growth Nonlinear Beamentioning

confidence: 99%

Analysis of beam plasma instability effects on incoherent scatter spectra

et al. 2010

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Abstract. Naturally Enhanced Ion Acoustic Lines (NEIALs) detected with Incoherent Scatter Radars (ISRs) can be produced by a Langmuir decay mechanism, triggered by a bump on tail instability. A recent model of the beam-plasma instability suggests that weak-warm beams, such those associated with NEIAL events, might produce Langmuir harmonics which could be detected by a properly configured ISR. The analysis performed in this work shows that such a beamdriven wave may be simultaneously detected with NEIALs within the baseband signal of a single ISR. The analysis shows that simultaneous detection of NEIALs and the first Langmuir harmonic is more likely than simultaneous detection of NEIALs and enhanced plasma line. This detection not only would help to discriminate between current NEIAL models, but could also aid in the parameter estimation of soft precipitating electrons.

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“…Electron phase-space-density holes (e.g. Berk and Roberts, 1967) or electrostatic solitary waves (Matsumoto et al, 1994) are coherent nonlinear electrostatic structures, while harmonic Langmuir waves and Langmuir wave packets have an incoherent quasi-power-law wavenumber spectrum which indicate a turbulent feature Gaelzer et al, 2003;Umeda et al, 2003;Umeda, 2006;Silin et al, 2007). The present study is aimed at the generation of amplitude-modulated Langmuir waves and Langmuir wave packets which is called a Langmuir turbulence in space plasmas.…”

Section: Introductionmentioning

confidence: 99%

Vlasov simulation of Langmuir wave packets

Umeda

2007

Nonlin. Processes Geophys.

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Abstract. Amplitude modulation and packet formation of Langmuir waves are commonly observed during a nonlinear interaction between electron beams and plasmas. In this paper, we briefly review the history of Langmuir wave packets as developed by recent spacecraft observations and computer simulations. New one-dimensional electrostatic Vlasov simulations are performed to study their formation processes. It is found that the formation of Langmuir wave packets involves both an incoherent turbulent process and a coherent nonlinear trapping process. Existence of cold ions does not affect nonlinear processes of the weak-electron-beam instability in which the ion distribution is hardly modified by the excited Langmuir wave packets.

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Harmonic Langmuir waves. III. Vlasov simulation

Cited by 58 publications

References 53 publications

Formation of quasi-power law weak Langmuir turbulence spectrum by harmonic generation

Formation of quasi-power law weak Langmuir turbulence spectrum by harmonic generation

Analysis of beam plasma instability effects on incoherent scatter spectra

Vlasov simulation of Langmuir wave packets

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