Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/187816 |
Resumo: | Observations show that plasma particles in the solar wind frequently display power-law velocity distributions, which can be isotropic or anisotropic. Particularly, the velocity distribution functions of solar wind electrons are frequently modeled as a combination of a background Maxwellian distribution and a non-thermal distribution which is known as the “halo” distribution. For fast solar wind conditions, highly anisotropic field-aligned electrons, denominated as the “strahl” distribution, are also present. Motivated by these observations, the present paper considers a tenuous plasma with Maxwellian ions, and electrons described by a summation of an isotropic Maxwellian distribution and an isotropic Kappa distribution. The formalism of weak turbulence theory is utilized in order to discuss the spectra of electrostatic waves that must be present in such a plasma, satisfying the conditions of quasi-equilibrium between the processes of spontaneous fluctuations and of induced emission. The kappa index and relative density of the Kappa electron distribution are varied. By taking into account the effects due to electromagnetic waves into the weak turbulence formalism, we investigate the electromagnetic spectra that satisfy the conditions of “turbulent equilibrium,” and also the time evolution of the wave spectra and of the electron distribution, which occurs in the case of the presence of an electron beam in the electron distribution. |
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Ferrão, Sabrina TigikPetruzzellis, Larissa TeixeiraZiebell, Luiz FernandoYoon, Peter H.Gaelzer, Rudi2019-01-16T04:11:05Z20171070-664Xhttp://hdl.handle.net/10183/187816001062027Observations show that plasma particles in the solar wind frequently display power-law velocity distributions, which can be isotropic or anisotropic. Particularly, the velocity distribution functions of solar wind electrons are frequently modeled as a combination of a background Maxwellian distribution and a non-thermal distribution which is known as the “halo” distribution. For fast solar wind conditions, highly anisotropic field-aligned electrons, denominated as the “strahl” distribution, are also present. Motivated by these observations, the present paper considers a tenuous plasma with Maxwellian ions, and electrons described by a summation of an isotropic Maxwellian distribution and an isotropic Kappa distribution. The formalism of weak turbulence theory is utilized in order to discuss the spectra of electrostatic waves that must be present in such a plasma, satisfying the conditions of quasi-equilibrium between the processes of spontaneous fluctuations and of induced emission. The kappa index and relative density of the Kappa electron distribution are varied. By taking into account the effects due to electromagnetic waves into the weak turbulence formalism, we investigate the electromagnetic spectra that satisfy the conditions of “turbulent equilibrium,” and also the time evolution of the wave spectra and of the electron distribution, which occurs in the case of the presence of an electron beam in the electron distribution.application/pdfengPhysics of plasmas. Melville. Vol. 24, no. 11 (Nov. 2017), 112902, 13 p.Vento solarProcessos de colisao em plasmasTurbulência em plasmasOndas de Langmuir em plasmasWeakly turbulent plasma processes in the presence of inverse power-law velocity tail populationEstrangeiroinfo: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:UFRGSTEXT001062027.pdf.txt001062027.pdf.txtExtracted Texttext/plain64281http://www.lume.ufrgs.br/bitstream/10183/187816/2/001062027.pdf.txt1ec60bc0f4baf6349987f2f42189250fMD52ORIGINAL001062027.pdfTexto completo (inglês)application/pdf1942069http://www.lume.ufrgs.br/bitstream/10183/187816/1/001062027.pdf9d47c4b70b4225109b103d5798c97ac0MD5110183/1878162023-09-23 03:37:02.405913oai:www.lume.ufrgs.br:10183/187816Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-23T06:37:02Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population |
title |
Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population |
spellingShingle |
Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population Ferrão, Sabrina Tigik Vento solar Processos de colisao em plasmas Turbulência em plasmas Ondas de Langmuir em plasmas |
title_short |
Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population |
title_full |
Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population |
title_fullStr |
Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population |
title_full_unstemmed |
Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population |
title_sort |
Weakly turbulent plasma processes in the presence of inverse power-law velocity tail population |
author |
Ferrão, Sabrina Tigik |
author_facet |
Ferrão, Sabrina Tigik Petruzzellis, Larissa Teixeira Ziebell, Luiz Fernando Yoon, Peter H. Gaelzer, Rudi |
author_role |
author |
author2 |
Petruzzellis, Larissa Teixeira Ziebell, Luiz Fernando Yoon, Peter H. Gaelzer, Rudi |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Ferrão, Sabrina Tigik Petruzzellis, Larissa Teixeira Ziebell, Luiz Fernando Yoon, Peter H. Gaelzer, Rudi |
dc.subject.por.fl_str_mv |
Vento solar Processos de colisao em plasmas Turbulência em plasmas Ondas de Langmuir em plasmas |
topic |
Vento solar Processos de colisao em plasmas Turbulência em plasmas Ondas de Langmuir em plasmas |
description |
Observations show that plasma particles in the solar wind frequently display power-law velocity distributions, which can be isotropic or anisotropic. Particularly, the velocity distribution functions of solar wind electrons are frequently modeled as a combination of a background Maxwellian distribution and a non-thermal distribution which is known as the “halo” distribution. For fast solar wind conditions, highly anisotropic field-aligned electrons, denominated as the “strahl” distribution, are also present. Motivated by these observations, the present paper considers a tenuous plasma with Maxwellian ions, and electrons described by a summation of an isotropic Maxwellian distribution and an isotropic Kappa distribution. The formalism of weak turbulence theory is utilized in order to discuss the spectra of electrostatic waves that must be present in such a plasma, satisfying the conditions of quasi-equilibrium between the processes of spontaneous fluctuations and of induced emission. The kappa index and relative density of the Kappa electron distribution are varied. By taking into account the effects due to electromagnetic waves into the weak turbulence formalism, we investigate the electromagnetic spectra that satisfy the conditions of “turbulent equilibrium,” and also the time evolution of the wave spectra and of the electron distribution, which occurs in the case of the presence of an electron beam in the electron distribution. |
publishDate |
2017 |
dc.date.issued.fl_str_mv |
2017 |
dc.date.accessioned.fl_str_mv |
2019-01-16T04:11:05Z |
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/10183/187816 |
dc.identifier.issn.pt_BR.fl_str_mv |
1070-664X |
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001062027 |
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1070-664X 001062027 |
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http://hdl.handle.net/10183/187816 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physics of plasmas. Melville. Vol. 24, no. 11 (Nov. 2017), 112902, 13 p. |
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info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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