On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability
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/10183/184753 |
Resumo: | The dispersion relation for ion-cyclotron waves propagating along the direction of the ambient magnetic field is investigated numerically by considering different forms of kappa functions as velocity distributions of ions and electrons. General forms of kappa distributions, isotropic and anisotropic, are defined and used to obtain the dispersion relations for ion-cyclotron waves. With suitable choice of parameters, the general forms reduce to anisotropic versions of the kappa distributions most frequently employed in the literature. The analysis is focused in cases with a small value of the kappa index, for which the non thermal character of the kappa distributions is enhanced. The results show the effects of the superthermal tails of the velocity distributions of both particle species (ions and electrons) on the growth rate of the ion-cyclotron instability. It is seen that different forms of anisotropic kappa distributions, which are used in the current literature, can have a significantly different effect on the growth rates of the instability. |
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Ziebell, Luiz FernandoGaelzer, Rudi2018-11-17T03:12:03Z20171070-664Xhttp://hdl.handle.net/10183/184753001062021The dispersion relation for ion-cyclotron waves propagating along the direction of the ambient magnetic field is investigated numerically by considering different forms of kappa functions as velocity distributions of ions and electrons. General forms of kappa distributions, isotropic and anisotropic, are defined and used to obtain the dispersion relations for ion-cyclotron waves. With suitable choice of parameters, the general forms reduce to anisotropic versions of the kappa distributions most frequently employed in the literature. The analysis is focused in cases with a small value of the kappa index, for which the non thermal character of the kappa distributions is enhanced. The results show the effects of the superthermal tails of the velocity distributions of both particle species (ions and electrons) on the growth rate of the ion-cyclotron instability. It is seen that different forms of anisotropic kappa distributions, which are used in the current literature, can have a significantly different effect on the growth rates of the instability.application/pdfengPhysics of plasmas. Melville. Vol. 24, no. 10 (Oct. 2017), 102108, 12 p.Propagação de ondas eletromagnéticasAnálise numéricaRelações de dispersãoInstabilidades em plasmasOn the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instabilityEstrangeiroinfo: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:UFRGSTEXT001062021.pdf.txt001062021.pdf.txtExtracted Texttext/plain53125http://www.lume.ufrgs.br/bitstream/10183/184753/2/001062021.pdf.txtf0ccfd3c3b2ab8eb24d48ba46b0441ebMD52ORIGINAL001062021.pdfTexto completo (inglês)application/pdf3361891http://www.lume.ufrgs.br/bitstream/10183/184753/1/001062021.pdf0f6a3d402437e72139086f9c000f1272MD5110183/1847532023-09-23 03:36:50.157294oai:www.lume.ufrgs.br:10183/184753Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-23T06:36:50Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability |
title |
On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability |
spellingShingle |
On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability Ziebell, Luiz Fernando Propagação de ondas eletromagnéticas Análise numérica Relações de dispersão Instabilidades em plasmas |
title_short |
On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability |
title_full |
On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability |
title_fullStr |
On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability |
title_full_unstemmed |
On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability |
title_sort |
On the influence of the shape of kappa distributions of ions and electrons on the ioncyclotron instability |
author |
Ziebell, Luiz Fernando |
author_facet |
Ziebell, Luiz Fernando Gaelzer, Rudi |
author_role |
author |
author2 |
Gaelzer, Rudi |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Ziebell, Luiz Fernando Gaelzer, Rudi |
dc.subject.por.fl_str_mv |
Propagação de ondas eletromagnéticas Análise numérica Relações de dispersão Instabilidades em plasmas |
topic |
Propagação de ondas eletromagnéticas Análise numérica Relações de dispersão Instabilidades em plasmas |
description |
The dispersion relation for ion-cyclotron waves propagating along the direction of the ambient magnetic field is investigated numerically by considering different forms of kappa functions as velocity distributions of ions and electrons. General forms of kappa distributions, isotropic and anisotropic, are defined and used to obtain the dispersion relations for ion-cyclotron waves. With suitable choice of parameters, the general forms reduce to anisotropic versions of the kappa distributions most frequently employed in the literature. The analysis is focused in cases with a small value of the kappa index, for which the non thermal character of the kappa distributions is enhanced. The results show the effects of the superthermal tails of the velocity distributions of both particle species (ions and electrons) on the growth rate of the ion-cyclotron instability. It is seen that different forms of anisotropic kappa distributions, which are used in the current literature, can have a significantly different effect on the growth rates of the instability. |
publishDate |
2017 |
dc.date.issued.fl_str_mv |
2017 |
dc.date.accessioned.fl_str_mv |
2018-11-17T03:12:03Z |
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/10183/184753 |
dc.identifier.issn.pt_BR.fl_str_mv |
1070-664X |
dc.identifier.nrb.pt_BR.fl_str_mv |
001062021 |
identifier_str_mv |
1070-664X 001062021 |
url |
http://hdl.handle.net/10183/184753 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physics of plasmas. Melville. Vol. 24, no. 10 (Oct. 2017), 102108, 12 p. |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
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reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
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UFRGS |
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Repositório Institucional da UFRGS |
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Repositório Institucional da UFRGS |
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