The oblique firehose instability in a bi-kappa magnetized plasma
Autor(a) principal: | |
---|---|
Data de Publicação: | 2018 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/204113 |
Resumo: | In this work, we derive a dispersion equation that describes the excitation of the oblique (or Alfvén) firehose instability in a plasma that contains both electron and ion species modelled by bi-kappa velocity distribution functions. The equation is obtained with the assumptions of low-frequency waves and moderate to large values of the parallel (respective to the ambient magnetic field) plasma beta parameter, but it is valid for any direction of propagation and for any value of the particle gyroradius (or Larmor radius). Considering values for the physical parameters typical to those found in the solar wind, some solutions of the dispersion equation, corresponding to the unstable mode, are presented. In order to implement the dispersion solver, several new mathematical properties of the special functions occurring in a kappa plasma are derived and included. The results presented here suggest that the superthermal characteristic of the distribution functions leads to reductions to both the maximum growth rate of the instability and of the spectral range of its occurrence. |
id |
UFRGS-2_702302fb0ffb9d2dda9fe4e76254929b |
---|---|
oai_identifier_str |
oai:www.lume.ufrgs.br:10183/204113 |
network_acronym_str |
UFRGS-2 |
network_name_str |
Repositório Institucional da UFRGS |
repository_id_str |
|
spelling |
Meneses, Anelise RamiresGaelzer, RudiZiebell, Luiz Fernando2020-01-14T04:15:25Z20181070-664Xhttp://hdl.handle.net/10183/204113001109687In this work, we derive a dispersion equation that describes the excitation of the oblique (or Alfvén) firehose instability in a plasma that contains both electron and ion species modelled by bi-kappa velocity distribution functions. The equation is obtained with the assumptions of low-frequency waves and moderate to large values of the parallel (respective to the ambient magnetic field) plasma beta parameter, but it is valid for any direction of propagation and for any value of the particle gyroradius (or Larmor radius). Considering values for the physical parameters typical to those found in the solar wind, some solutions of the dispersion equation, corresponding to the unstable mode, are presented. In order to implement the dispersion solver, several new mathematical properties of the special functions occurring in a kappa plasma are derived and included. The results presented here suggest that the superthermal characteristic of the distribution functions leads to reductions to both the maximum growth rate of the instability and of the spectral range of its occurrence.application/pdfengPhysics of plasmas. Melville. Vol. 25, no. 11 (Dec. 2018), 112901, 14 p.Ondas de Alfvén em plasmaTeoria cinetica de plasmasRelações de dispersãoThe oblique firehose instability in a bi-kappa magnetized plasmaEstrangeiroinfo: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:UFRGSTEXT001109687.pdf.txt001109687.pdf.txtExtracted Texttext/plain64064http://www.lume.ufrgs.br/bitstream/10183/204113/2/001109687.pdf.txt3839c67e7cfcec48a2e48edbe7f37e20MD52ORIGINAL001109687.pdfTexto completo (inglês)application/pdf1993361http://www.lume.ufrgs.br/bitstream/10183/204113/1/001109687.pdffd255f84cd7b15d42e282620cea450c2MD5110183/2041132023-09-23 03:34:47.213022oai:www.lume.ufrgs.br:10183/204113Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-23T06:34:47Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
The oblique firehose instability in a bi-kappa magnetized plasma |
title |
The oblique firehose instability in a bi-kappa magnetized plasma |
spellingShingle |
The oblique firehose instability in a bi-kappa magnetized plasma Meneses, Anelise Ramires Ondas de Alfvén em plasma Teoria cinetica de plasmas Relações de dispersão |
title_short |
The oblique firehose instability in a bi-kappa magnetized plasma |
title_full |
The oblique firehose instability in a bi-kappa magnetized plasma |
title_fullStr |
The oblique firehose instability in a bi-kappa magnetized plasma |
title_full_unstemmed |
The oblique firehose instability in a bi-kappa magnetized plasma |
title_sort |
The oblique firehose instability in a bi-kappa magnetized plasma |
author |
Meneses, Anelise Ramires |
author_facet |
Meneses, Anelise Ramires Gaelzer, Rudi Ziebell, Luiz Fernando |
author_role |
author |
author2 |
Gaelzer, Rudi Ziebell, Luiz Fernando |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Meneses, Anelise Ramires Gaelzer, Rudi Ziebell, Luiz Fernando |
dc.subject.por.fl_str_mv |
Ondas de Alfvén em plasma Teoria cinetica de plasmas Relações de dispersão |
topic |
Ondas de Alfvén em plasma Teoria cinetica de plasmas Relações de dispersão |
description |
In this work, we derive a dispersion equation that describes the excitation of the oblique (or Alfvén) firehose instability in a plasma that contains both electron and ion species modelled by bi-kappa velocity distribution functions. The equation is obtained with the assumptions of low-frequency waves and moderate to large values of the parallel (respective to the ambient magnetic field) plasma beta parameter, but it is valid for any direction of propagation and for any value of the particle gyroradius (or Larmor radius). Considering values for the physical parameters typical to those found in the solar wind, some solutions of the dispersion equation, corresponding to the unstable mode, are presented. In order to implement the dispersion solver, several new mathematical properties of the special functions occurring in a kappa plasma are derived and included. The results presented here suggest that the superthermal characteristic of the distribution functions leads to reductions to both the maximum growth rate of the instability and of the spectral range of its occurrence. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018 |
dc.date.accessioned.fl_str_mv |
2020-01-14T04:15:25Z |
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/10183/204113 |
dc.identifier.issn.pt_BR.fl_str_mv |
1070-664X |
dc.identifier.nrb.pt_BR.fl_str_mv |
001109687 |
identifier_str_mv |
1070-664X 001109687 |
url |
http://hdl.handle.net/10183/204113 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physics of plasmas. Melville. Vol. 25, no. 11 (Dec. 2018), 112901, 14 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 |
dc.source.none.fl_str_mv |
reponame:Repositório Institucional da UFRGS instname:Universidade Federal do Rio Grande do Sul (UFRGS) instacron:UFRGS |
instname_str |
Universidade Federal do Rio Grande do Sul (UFRGS) |
instacron_str |
UFRGS |
institution |
UFRGS |
reponame_str |
Repositório Institucional da UFRGS |
collection |
Repositório Institucional da UFRGS |
bitstream.url.fl_str_mv |
http://www.lume.ufrgs.br/bitstream/10183/204113/2/001109687.pdf.txt http://www.lume.ufrgs.br/bitstream/10183/204113/1/001109687.pdf |
bitstream.checksum.fl_str_mv |
3839c67e7cfcec48a2e48edbe7f37e20 fd255f84cd7b15d42e282620cea450c2 |
bitstream.checksumAlgorithm.fl_str_mv |
MD5 MD5 |
repository.name.fl_str_mv |
Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS) |
repository.mail.fl_str_mv |
|
_version_ |
1801224981867134976 |