Articles | Volume 11, issue 2
Nonlin. Processes Geophys., 11, 267–274, 2004
https://doi.org/10.5194/npg-11-267-2004

Special issue: International Workshops on Nonlinear Waves and Chaos in Space...

Nonlin. Processes Geophys., 11, 267–274, 2004
https://doi.org/10.5194/npg-11-267-2004

  14 Apr 2004

14 Apr 2004

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

P. H. Yoon P. H. Yoon
  • Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742, USA

Abstract. Langmuir wave turbulence generated by a beam-plasma 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.