Dynamic of Langmuir wave decay in two dimensions
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/141714 |
Resumo: | The 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. |
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Ziebell, Luiz FernandoGaelzer, RudiYoon, Peter H.2016-05-24T02:10:51Z20081070-664Xhttp://hdl.handle.net/10183/141714000624327The 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.application/pdfengPhysics of plasmas. Vol. 15, no. 3 (Mar. 2008), 032303, 11p.GeofísicaOndas de Langmuir em plasmasPropagacao de ondas eletromagneticas em plasmasDynamic of Langmuir wave decay in two dimensionsEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000624327.pdf000624327.pdfTexto completo (inglês)application/pdf2929679http://www.lume.ufrgs.br/bitstream/10183/141714/1/000624327.pdfe5dec71572f531e0ea4e2781f36bb67eMD51TEXT000624327.pdf.txt000624327.pdf.txtExtracted Texttext/plain42569http://www.lume.ufrgs.br/bitstream/10183/141714/2/000624327.pdf.txt25f7a5b1da72343cc462c7d6a8e36624MD52THUMBNAIL000624327.pdf.jpg000624327.pdf.jpgGenerated Thumbnailimage/jpeg2112http://www.lume.ufrgs.br/bitstream/10183/141714/3/000624327.pdf.jpg907cda5496fa9cab0e2463bd2f03cd17MD5310183/1417142023-09-24 03:38:09.143268oai:www.lume.ufrgs.br:10183/141714Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-24T06:38:09Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Dynamic of Langmuir wave decay in two dimensions |
title |
Dynamic of Langmuir wave decay in two dimensions |
spellingShingle |
Dynamic of Langmuir wave decay in two dimensions Ziebell, Luiz Fernando Geofísica Ondas de Langmuir em plasmas Propagacao de ondas eletromagneticas em plasmas |
title_short |
Dynamic of Langmuir wave decay in two dimensions |
title_full |
Dynamic of Langmuir wave decay in two dimensions |
title_fullStr |
Dynamic of Langmuir wave decay in two dimensions |
title_full_unstemmed |
Dynamic of Langmuir wave decay in two dimensions |
title_sort |
Dynamic of Langmuir wave decay in two dimensions |
author |
Ziebell, Luiz Fernando |
author_facet |
Ziebell, Luiz Fernando Gaelzer, Rudi Yoon, Peter H. |
author_role |
author |
author2 |
Gaelzer, Rudi Yoon, Peter H. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Ziebell, Luiz Fernando Gaelzer, Rudi Yoon, Peter H. |
dc.subject.por.fl_str_mv |
Geofísica Ondas de Langmuir em plasmas Propagacao de ondas eletromagneticas em plasmas |
topic |
Geofísica Ondas de Langmuir em plasmas Propagacao de ondas eletromagneticas em plasmas |
description |
The 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. |
publishDate |
2008 |
dc.date.issued.fl_str_mv |
2008 |
dc.date.accessioned.fl_str_mv |
2016-05-24T02:10:51Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/141714 |
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1070-664X |
dc.identifier.nrb.pt_BR.fl_str_mv |
000624327 |
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1070-664X 000624327 |
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http://hdl.handle.net/10183/141714 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physics of plasmas. Vol. 15, no. 3 (Mar. 2008), 032303, 11p. |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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