The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming Instability
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | https://ciencia.iscte-iul.pt/public/pub/id/6397 http://hdl.handle.net/10071/6706 |
Resumo: | A non-resonant instability for the amplification of the interstellar magnetic field in young supernova remnant (SNR) shocks was predicted by Bell, and is thought to be relevant for the acceleration of cosmic-ray (CR) particles. For this instability, the CRs streaming ahead of SNR shock fronts drive electromagnetic waves with wavelengths much shorter than the typical CR Larmor radius, by inducing a current parallel to the background magnetic field. We explore the nonlinear regime of the non-resonant mode using Particle-in-Cell hybrid simulations, with kinetic ions and fluid electrons, and analyze the saturation mechanism for realistic CR and background plasma parameters. In the linear regime, the observed growth rates and wavelengths match the theoretical predictions; the nonlinear stage of the instability shows a strong reaction of both the background plasma and the CR particles, with the saturation level of the magnetic field varying with the CR parameters. The simulations with CR-to-background density ratios of n CR/n b = 10–5 reveal the highest magnetic field saturation levels, with energy also being transferred to the background plasma and to the perpendicular velocity components of the CR particles. The results show that amplification factors > 10 for the magnetic field can be achieved, and suggest that this instability is important for the generation of magnetic field turbulence, and for the acceleration of CR particles. |
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The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming InstabilityCosmic raysInstabilitiesISM: supernova remnantsMagnetic fieldsA non-resonant instability for the amplification of the interstellar magnetic field in young supernova remnant (SNR) shocks was predicted by Bell, and is thought to be relevant for the acceleration of cosmic-ray (CR) particles. For this instability, the CRs streaming ahead of SNR shock fronts drive electromagnetic waves with wavelengths much shorter than the typical CR Larmor radius, by inducing a current parallel to the background magnetic field. We explore the nonlinear regime of the non-resonant mode using Particle-in-Cell hybrid simulations, with kinetic ions and fluid electrons, and analyze the saturation mechanism for realistic CR and background plasma parameters. In the linear regime, the observed growth rates and wavelengths match the theoretical predictions; the nonlinear stage of the instability shows a strong reaction of both the background plasma and the CR particles, with the saturation level of the magnetic field varying with the CR parameters. The simulations with CR-to-background density ratios of n CR/n b = 10–5 reveal the highest magnetic field saturation levels, with energy also being transferred to the background plasma and to the perpendicular velocity components of the CR particles. The results show that amplification factors > 10 for the magnetic field can be achieved, and suggest that this instability is important for the generation of magnetic field turbulence, and for the acceleration of CR particles.IOP PUBLISHING LTD2014-03-24T17:39:03Z2010-01-01T00:00:00Z20102014-03-24T17:34:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://ciencia.iscte-iul.pt/public/pub/id/6397http://hdl.handle.net/10071/6706eng2041-8205Gargaté, L.Fonseca, R. A.Niemiec, J.Bingham, R.Silva, L. O.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-09T17:26:44Zoai:repositorio.iscte-iul.pt:10071/6706Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:11:57.068352Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming Instability |
title |
The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming Instability |
spellingShingle |
The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming Instability Gargaté, L. Cosmic rays Instabilities ISM: supernova remnants Magnetic fields |
title_short |
The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming Instability |
title_full |
The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming Instability |
title_fullStr |
The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming Instability |
title_full_unstemmed |
The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming Instability |
title_sort |
The Nonlinear Saturation of the Non-resonant Kinetically Driven Streaming Instability |
author |
Gargaté, L. |
author_facet |
Gargaté, L. Fonseca, R. A. Niemiec, J. Bingham, R. Silva, L. O. |
author_role |
author |
author2 |
Fonseca, R. A. Niemiec, J. Bingham, R. Silva, L. O. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Gargaté, L. Fonseca, R. A. Niemiec, J. Bingham, R. Silva, L. O. |
dc.subject.por.fl_str_mv |
Cosmic rays Instabilities ISM: supernova remnants Magnetic fields |
topic |
Cosmic rays Instabilities ISM: supernova remnants Magnetic fields |
description |
A non-resonant instability for the amplification of the interstellar magnetic field in young supernova remnant (SNR) shocks was predicted by Bell, and is thought to be relevant for the acceleration of cosmic-ray (CR) particles. For this instability, the CRs streaming ahead of SNR shock fronts drive electromagnetic waves with wavelengths much shorter than the typical CR Larmor radius, by inducing a current parallel to the background magnetic field. We explore the nonlinear regime of the non-resonant mode using Particle-in-Cell hybrid simulations, with kinetic ions and fluid electrons, and analyze the saturation mechanism for realistic CR and background plasma parameters. In the linear regime, the observed growth rates and wavelengths match the theoretical predictions; the nonlinear stage of the instability shows a strong reaction of both the background plasma and the CR particles, with the saturation level of the magnetic field varying with the CR parameters. The simulations with CR-to-background density ratios of n CR/n b = 10–5 reveal the highest magnetic field saturation levels, with energy also being transferred to the background plasma and to the perpendicular velocity components of the CR particles. The results show that amplification factors > 10 for the magnetic field can be achieved, and suggest that this instability is important for the generation of magnetic field turbulence, and for the acceleration of CR particles. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-01-01T00:00:00Z 2010 2014-03-24T17:39:03Z 2014-03-24T17:34:11Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://ciencia.iscte-iul.pt/public/pub/id/6397 http://hdl.handle.net/10071/6706 |
url |
https://ciencia.iscte-iul.pt/public/pub/id/6397 http://hdl.handle.net/10071/6706 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
2041-8205 |
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.publisher.none.fl_str_mv |
IOP PUBLISHING LTD |
publisher.none.fl_str_mv |
IOP PUBLISHING LTD |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799134674445926400 |