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Nonlinear evolution of beam-plasma instability in inhomogeneous medium

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Nonlinear evolution of beam-plasma instability in inhomogeneous medium

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Título Nonlinear evolution of beam-plasma instability in inhomogeneous medium
Autor Ziebell, Luiz Fernando
Yoon, Peter H.
Pavan, Joel
Gaelzer, Rudi
Abstract The problem of electron-beam propagation in inhomogeneous solar wind is intimately related to the solar type II and/or type III radio bursts. Many scientists have addressed this issue in the past bymeans of quasi-linear theory, but in order to fully characterize the nonlinear dynamics, one must employ weak-turbulence theory. Available numerical solutions of the weak-turbulence theory either rely on only one nonlinear process (either decay or scattering), or when both nonlinear terms are included, the inhomogeneity effect is generally ignored. The present paper reports the full solution of weak-turbulence theory that includes both decay and scattering processes, and also incorporating the effects of density gradient. It is found that the quasi-linear effect sufficiently accounts for the primary Langmuir waves, but to properly characterize the back-scattered Langmuir wave, which is important for eventual radiation generation, it is found that both nonlinear decay and scattering processes make comparable contributions. Such a finding may be important in the quantitative analysis of the plasma emission process with application to solar type II and/or type III radio bursts.
Contido em The astrophysical journal. Bristol. Vol. 727, no. 1 (Jan. 2011), 16, 8 p.
Assunto Fontes de plasma
Materia interplanetaria
Plasmas astrofisicos
Turbulência em plasmas
Vento solar
[en] Instabilities
[en] Plasmas
[en] Solar wind
[en] Turbulence
[en] Waves
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108974
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