Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/142379 |
Resumo: | Linear and nonlinear coupled drift-ion acoustic waves are investigated in a nonuniform magnetoplasma having kappa distributed electrons and positrons. In the linear regime, the role of kappa distribution and positron content on the dispersion relation has been highlighted; it is found that strong superthermality (low value of j) and addition of positrons lowers the phase velocity via decreasing the fundamental scalelengths of the plasmas. In the nonlinear regime, first, coherent nonlinear structure in the form of dipoles and monopoles are obtained and the boundary conditions (boundedness) in the context of superthermality and positron concentrations are discussed. Second, in case of scalar nonlinearity, a Korteweg–de Vries-type equation is obtained, which admit solitary wave solution. It is found that both compressive and rarefactive solitons are formed in the present model. The present work may be useful to understand the low frequency electrostatic modes in inhomogeneous electron positron ion plasmas, which exist in astrophysical plasma situations such as those found in the pulsar magnetosphere. |
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Adnan, MuhammadMahmood, ShahzadQamar, Anisa2016-06-09T02:08:24Z20141070-664Xhttp://hdl.handle.net/10183/142379000943751Linear and nonlinear coupled drift-ion acoustic waves are investigated in a nonuniform magnetoplasma having kappa distributed electrons and positrons. In the linear regime, the role of kappa distribution and positron content on the dispersion relation has been highlighted; it is found that strong superthermality (low value of j) and addition of positrons lowers the phase velocity via decreasing the fundamental scalelengths of the plasmas. In the nonlinear regime, first, coherent nonlinear structure in the form of dipoles and monopoles are obtained and the boundary conditions (boundedness) in the context of superthermality and positron concentrations are discussed. Second, in case of scalar nonlinearity, a Korteweg–de Vries-type equation is obtained, which admit solitary wave solution. It is found that both compressive and rarefactive solitons are formed in the present model. The present work may be useful to understand the low frequency electrostatic modes in inhomogeneous electron positron ion plasmas, which exist in astrophysical plasma situations such as those found in the pulsar magnetosphere.application/pdfengPhysics of plasmas. Melville. Vol. 21, no. 9 (Sept. 2014), 092119, 8 p.Plasmas astrofisicosSólitons em plasmasRelações de dispersãoOndas de deriva em plasmasOndas íon-acústicas em plasmasCoupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmasEstrangeiroinfo: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:UFRGSORIGINAL000943751.pdf000943751.pdfTexto completo (inglês)application/pdf1134683http://www.lume.ufrgs.br/bitstream/10183/142379/1/000943751.pdffbad0388b75f5cc86554dae34376867bMD51TEXT000943751.pdf.txt000943751.pdf.txtExtracted Texttext/plain41685http://www.lume.ufrgs.br/bitstream/10183/142379/2/000943751.pdf.txt2da128d75283726bf0d61df852758cb0MD52THUMBNAIL000943751.pdf.jpg000943751.pdf.jpgGenerated Thumbnailimage/jpeg2179http://www.lume.ufrgs.br/bitstream/10183/142379/3/000943751.pdf.jpg676e5a0ed207d4b7c33ff9b9c41625bbMD5310183/1423792021-09-18 04:55:24.530542oai:www.lume.ufrgs.br:10183/142379Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2021-09-18T07:55:24Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas |
title |
Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas |
spellingShingle |
Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas Adnan, Muhammad Plasmas astrofisicos Sólitons em plasmas Relações de dispersão Ondas de deriva em plasmas Ondas íon-acústicas em plasmas |
title_short |
Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas |
title_full |
Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas |
title_fullStr |
Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas |
title_full_unstemmed |
Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas |
title_sort |
Coupled ion acoustic and drift waves in magnetized superthermal electron-positron-ion plasmas |
author |
Adnan, Muhammad |
author_facet |
Adnan, Muhammad Mahmood, Shahzad Qamar, Anisa |
author_role |
author |
author2 |
Mahmood, Shahzad Qamar, Anisa |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Adnan, Muhammad Mahmood, Shahzad Qamar, Anisa |
dc.subject.por.fl_str_mv |
Plasmas astrofisicos Sólitons em plasmas Relações de dispersão Ondas de deriva em plasmas Ondas íon-acústicas em plasmas |
topic |
Plasmas astrofisicos Sólitons em plasmas Relações de dispersão Ondas de deriva em plasmas Ondas íon-acústicas em plasmas |
description |
Linear and nonlinear coupled drift-ion acoustic waves are investigated in a nonuniform magnetoplasma having kappa distributed electrons and positrons. In the linear regime, the role of kappa distribution and positron content on the dispersion relation has been highlighted; it is found that strong superthermality (low value of j) and addition of positrons lowers the phase velocity via decreasing the fundamental scalelengths of the plasmas. In the nonlinear regime, first, coherent nonlinear structure in the form of dipoles and monopoles are obtained and the boundary conditions (boundedness) in the context of superthermality and positron concentrations are discussed. Second, in case of scalar nonlinearity, a Korteweg–de Vries-type equation is obtained, which admit solitary wave solution. It is found that both compressive and rarefactive solitons are formed in the present model. The present work may be useful to understand the low frequency electrostatic modes in inhomogeneous electron positron ion plasmas, which exist in astrophysical plasma situations such as those found in the pulsar magnetosphere. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014 |
dc.date.accessioned.fl_str_mv |
2016-06-09T02:08:24Z |
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/10183/142379 |
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1070-664X |
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000943751 |
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http://hdl.handle.net/10183/142379 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Physics of plasmas. Melville. Vol. 21, no. 9 (Sept. 2014), 092119, 8 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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