The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability
Autor(a) principal: | |
---|---|
Data de Publicação: | 2016 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10071/13096 |
Resumo: | An investigation of magnetic fields generated in an expanding bubble of plasma with misaligned temperature and density gradients (driving the Biermann battery mechanism) is performed. With gradient scales L, large-scale magnetic fields are generated by the Biermann battery mechanism with plasma beta similar to 1, as long as L is comparable to the ion inertial length d(i). For larger system sizes, L/d(e) > 100 (where d(e) is the electron inertial length), the Weibel instability generates magnetic fields of similar magnitude but with wavenumber kd(e) approximate to 0.2. In both cases, the growth and saturation of these fields have a weak dependence on mass ratio m(i)/m(e), indicating electron mediated physics. A scan in system size is performed at m(i)/m(e) = 2000, showing agreement with previous results with m(i)/m(e) = 25. In addition, the instability found at large system sizes is quantitatively demonstrated to be the Weibel instability. Furthermore, magnetic and electric energy spectra at scales below the electron Larmor radius are found to exhibit power law behavior with spectral indices -16/3 and -4/3, respectively. Published by AIP Publishing. |
id |
RCAP_d1668d864de3137193a57d6b03bb26b3 |
---|---|
oai_identifier_str |
oai:repositorio.iscte-iul.pt:10071/13096 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instabilityLaser-produced plasmasElectromagnetic-fieldDynamo theoryAccelerationSaturationAn investigation of magnetic fields generated in an expanding bubble of plasma with misaligned temperature and density gradients (driving the Biermann battery mechanism) is performed. With gradient scales L, large-scale magnetic fields are generated by the Biermann battery mechanism with plasma beta similar to 1, as long as L is comparable to the ion inertial length d(i). For larger system sizes, L/d(e) > 100 (where d(e) is the electron inertial length), the Weibel instability generates magnetic fields of similar magnitude but with wavenumber kd(e) approximate to 0.2. In both cases, the growth and saturation of these fields have a weak dependence on mass ratio m(i)/m(e), indicating electron mediated physics. A scan in system size is performed at m(i)/m(e) = 2000, showing agreement with previous results with m(i)/m(e) = 25. In addition, the instability found at large system sizes is quantitatively demonstrated to be the Weibel instability. Furthermore, magnetic and electric energy spectra at scales below the electron Larmor radius are found to exhibit power law behavior with spectral indices -16/3 and -4/3, respectively. Published by AIP Publishing.American Physical Society2017-04-21T13:09:48Z2016-01-01T00:00:00Z20162019-04-24T10:03:40Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10071/13096eng1070-664X10.1063/1.4946017Schoeffler, K. M.Loureiro, N. F.Fonseca, R. A.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:RCAAP2023-11-09T17:42:00Zoai:repositorio.iscte-iul.pt:10071/13096Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:19:35.349157Repositório 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 generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability |
title |
The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability |
spellingShingle |
The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability Schoeffler, K. M. Laser-produced plasmas Electromagnetic-field Dynamo theory Acceleration Saturation |
title_short |
The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability |
title_full |
The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability |
title_fullStr |
The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability |
title_full_unstemmed |
The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability |
title_sort |
The generation of magnetic fields by the Biermann battery and the interplay with the Weibel instability |
author |
Schoeffler, K. M. |
author_facet |
Schoeffler, K. M. Loureiro, N. F. Fonseca, R. A. Silva, L. O. |
author_role |
author |
author2 |
Loureiro, N. F. Fonseca, R. A. Silva, L. O. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Schoeffler, K. M. Loureiro, N. F. Fonseca, R. A. Silva, L. O. |
dc.subject.por.fl_str_mv |
Laser-produced plasmas Electromagnetic-field Dynamo theory Acceleration Saturation |
topic |
Laser-produced plasmas Electromagnetic-field Dynamo theory Acceleration Saturation |
description |
An investigation of magnetic fields generated in an expanding bubble of plasma with misaligned temperature and density gradients (driving the Biermann battery mechanism) is performed. With gradient scales L, large-scale magnetic fields are generated by the Biermann battery mechanism with plasma beta similar to 1, as long as L is comparable to the ion inertial length d(i). For larger system sizes, L/d(e) > 100 (where d(e) is the electron inertial length), the Weibel instability generates magnetic fields of similar magnitude but with wavenumber kd(e) approximate to 0.2. In both cases, the growth and saturation of these fields have a weak dependence on mass ratio m(i)/m(e), indicating electron mediated physics. A scan in system size is performed at m(i)/m(e) = 2000, showing agreement with previous results with m(i)/m(e) = 25. In addition, the instability found at large system sizes is quantitatively demonstrated to be the Weibel instability. Furthermore, magnetic and electric energy spectra at scales below the electron Larmor radius are found to exhibit power law behavior with spectral indices -16/3 and -4/3, respectively. Published by AIP Publishing. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-01-01T00:00:00Z 2016 2017-04-21T13:09:48Z 2019-04-24T10:03:40Z |
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 |
http://hdl.handle.net/10071/13096 |
url |
http://hdl.handle.net/10071/13096 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
1070-664X 10.1063/1.4946017 |
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 |
American Physical Society |
publisher.none.fl_str_mv |
American Physical Society |
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 |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
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 |
|
_version_ |
1799134755939155968 |