Magnetothermal instabilities in magnetized anisotropic plasmas

Detalhes bibliográficos
Autor(a) principal: Nakwacki, M. S.
Data de Publicação: 2012
Outros Autores: Peralta-Ramos, J. [UNESP]
Tipo de documento: Artigo de conferência
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1088/1742-6596/370/1/012038
http://hdl.handle.net/11449/73434
Resumo: Using the 16-moment transport equations for an ideal anisotropic collisionless plasma we analyze the influence of pressure anisotropy on the magnetothermal (MTI) and heat-flux-driven buoyancy (HBI) instabilities. We calculate the dispersion relation and the growth rates for these instabilities in the presence of a background heat flux and for configurations with static pressure anisotropy, finding that when the frequency at which heat conduction acts is much larger than any other frequency in the system (i.e. weak magnetic field) the pressure anisotropy has no effect on the MTI/HBI, provided the degree of anisotropy is small. In contrast, when this ordering of timescales does not apply the instability criteria depend on pressure anisotropy.
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spelling Magnetothermal instabilities in magnetized anisotropic plasmasAnisotropic plasmasDegree of anisotropyDispersion relationsInstability criterionPressure anisotropyStatic pressureTime-scalesTransport equationWeak magnetic fieldsHeat fluxAnisotropyUsing the 16-moment transport equations for an ideal anisotropic collisionless plasma we analyze the influence of pressure anisotropy on the magnetothermal (MTI) and heat-flux-driven buoyancy (HBI) instabilities. We calculate the dispersion relation and the growth rates for these instabilities in the presence of a background heat flux and for configurations with static pressure anisotropy, finding that when the frequency at which heat conduction acts is much larger than any other frequency in the system (i.e. weak magnetic field) the pressure anisotropy has no effect on the MTI/HBI, provided the degree of anisotropy is small. In contrast, when this ordering of timescales does not apply the instability criteria depend on pressure anisotropy.Instituto de Astronomía, Geofísica e Ciências Atmosféricas Universidade de São Paulo Cidade Universitária, Rua do Matão 1226, 05508-090 São PauloInstituto de Física Teórica Universidade Estadual Paulista, Rua Doutor Bento Teobaldo Ferraz 271 - Bloco II, 01140-070 São PauloInstituto de Física Teórica Universidade Estadual Paulista, Rua Doutor Bento Teobaldo Ferraz 271 - Bloco II, 01140-070 São PauloUniversidade de São Paulo (USP)Universidade Estadual Paulista (Unesp)Nakwacki, M. S.Peralta-Ramos, J. [UNESP]2014-05-27T11:26:53Z2014-05-27T11:26:53Z2012-07-13info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjecthttp://dx.doi.org/10.1088/1742-6596/370/1/012038Journal of Physics: Conference Series, v. 370, n. 1, 2012.1742-65881742-6596http://hdl.handle.net/11449/7343410.1088/1742-6596/370/1/0120382-s2.0-84863633077Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Physics: Conference Series0,2410,241info:eu-repo/semantics/openAccess2021-10-23T21:44:12Zoai:repositorio.unesp.br:11449/73434Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T21:52:20.601492Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Magnetothermal instabilities in magnetized anisotropic plasmas
title Magnetothermal instabilities in magnetized anisotropic plasmas
spellingShingle Magnetothermal instabilities in magnetized anisotropic plasmas
Nakwacki, M. S.
Anisotropic plasmas
Degree of anisotropy
Dispersion relations
Instability criterion
Pressure anisotropy
Static pressure
Time-scales
Transport equation
Weak magnetic fields
Heat flux
Anisotropy
title_short Magnetothermal instabilities in magnetized anisotropic plasmas
title_full Magnetothermal instabilities in magnetized anisotropic plasmas
title_fullStr Magnetothermal instabilities in magnetized anisotropic plasmas
title_full_unstemmed Magnetothermal instabilities in magnetized anisotropic plasmas
title_sort Magnetothermal instabilities in magnetized anisotropic plasmas
author Nakwacki, M. S.
author_facet Nakwacki, M. S.
Peralta-Ramos, J. [UNESP]
author_role author
author2 Peralta-Ramos, J. [UNESP]
author2_role author
dc.contributor.none.fl_str_mv Universidade de São Paulo (USP)
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Nakwacki, M. S.
Peralta-Ramos, J. [UNESP]
dc.subject.por.fl_str_mv Anisotropic plasmas
Degree of anisotropy
Dispersion relations
Instability criterion
Pressure anisotropy
Static pressure
Time-scales
Transport equation
Weak magnetic fields
Heat flux
Anisotropy
topic Anisotropic plasmas
Degree of anisotropy
Dispersion relations
Instability criterion
Pressure anisotropy
Static pressure
Time-scales
Transport equation
Weak magnetic fields
Heat flux
Anisotropy
description Using the 16-moment transport equations for an ideal anisotropic collisionless plasma we analyze the influence of pressure anisotropy on the magnetothermal (MTI) and heat-flux-driven buoyancy (HBI) instabilities. We calculate the dispersion relation and the growth rates for these instabilities in the presence of a background heat flux and for configurations with static pressure anisotropy, finding that when the frequency at which heat conduction acts is much larger than any other frequency in the system (i.e. weak magnetic field) the pressure anisotropy has no effect on the MTI/HBI, provided the degree of anisotropy is small. In contrast, when this ordering of timescales does not apply the instability criteria depend on pressure anisotropy.
publishDate 2012
dc.date.none.fl_str_mv 2012-07-13
2014-05-27T11:26:53Z
2014-05-27T11:26:53Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/conferenceObject
format conferenceObject
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1088/1742-6596/370/1/012038
Journal of Physics: Conference Series, v. 370, n. 1, 2012.
1742-6588
1742-6596
http://hdl.handle.net/11449/73434
10.1088/1742-6596/370/1/012038
2-s2.0-84863633077
url http://dx.doi.org/10.1088/1742-6596/370/1/012038
http://hdl.handle.net/11449/73434
identifier_str_mv Journal of Physics: Conference Series, v. 370, n. 1, 2012.
1742-6588
1742-6596
10.1088/1742-6596/370/1/012038
2-s2.0-84863633077
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Physics: Conference Series
0,241
0,241
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1808129368033067008

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