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dc.contributor.authorZiebell, Luiz Fernandopt_BR
dc.contributor.authorGaelzer, Rudipt_BR
dc.contributor.authorYoon, Peter H.pt_BR
dc.date.accessioned2016-05-24T02:10:51Zpt_BR
dc.date.issued2008pt_BR
dc.identifier.issn1070-664Xpt_BR
dc.identifier.urihttp://hdl.handle.net/10183/141714pt_BR
dc.description.abstractThe present paper reports on the first two-dimensional 2D self-consistent solution of weak turbulence equations describing the evolution of electron-beam-plasma interaction in which quasilinear as well as nonlinear three-wave decay processes are taken into account. It is found that the 2D Langmuir wave decay processes lead to the formation of a quasicircular ring spectrum in wave number space. It is also seen that the 2D ring-spectrum of Langmuir turbulence leads to a tendency to isotropic heating of the electrons. These findings contain some important ramifications. First, in the literature, isotropization of energetic electrons, detected in the solar wind for instance, is usually attributed to pitch-angle scattering. The present finding constitutes an alternative mechanism, whose efficiency for other parametric regimes has to be investigated. Second, when projected onto the one-dimensional 1D space, the 2D ring spectrum may give a false impression of Langmuir waves inverse cascading to longer wavelength regime, when in reality, the wavelength of the turbulence does not change at all but only the wave propagation angle changes. Although the present analysis excludes the induced scattering, which is another process potentially responsible for the inverse cascade, the present finding at least calls for an investigation into the relative efficacy of the inverse-cascading process in 1D vs 2D.en
dc.format.mimetypeapplication/pdfpt_BR
dc.language.isoengpt_BR
dc.relation.ispartofPhysics of plasmas. Vol. 15, no. 3 (Mar. 2008), 032303, 11p.pt_BR
dc.rightsOpen Accessen
dc.subjectGeofísicapt_BR
dc.subjectOndas de Langmuir em plasmaspt_BR
dc.subjectPropagacao de ondas eletromagneticas em plasmaspt_BR
dc.titleDynamic of Langmuir wave decay in two dimensionspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000624327pt_BR
dc.type.originEstrangeiropt_BR


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