Angular momentum transport by internal waves in the solar interior
Autor(a) principal: | |
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Data de Publicação: | 1997 |
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/10198/8290 |
Resumo: | The internal gravity waves of low frequency which are emitted at the base of the solar convection zone are able to extract angular momentum from the radiative interior. We evaluate this transport with some simplifying assumptions: we ignore the Coriolis force, approximate the spectrum of turbulent convection by the Kolmogorov law, and couple this turbulence to the internal waves through their pressure fluctuations, following Press (1981) and Garc´ıa L´opez & Spruit (1991). The local frequency of an internal wave varies with depth in a differentially rotating star, and it can vanish at some location, thus leading to enhanced damping (Goldreich & Nicholson 1989). It is this dissipation mechanism only that we take into account in the exchange of momentum between waves and stellar rotation. The flux of angular momentum is then an implicit function of depth, involving the local rotation rate and an integral representing the cumulative effect of radiative dissipation. We find that the efficiency of this transport process is rather high: it operates on a timescale of 107 years, and is probably responsible for the flat rotation profile which has been detected through helioseismology. |
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Angular momentum transport by internal waves in the solar interiorHydrodynamicsTurbulenceSun: interior: rotationStars: interiors: rotationThe internal gravity waves of low frequency which are emitted at the base of the solar convection zone are able to extract angular momentum from the radiative interior. We evaluate this transport with some simplifying assumptions: we ignore the Coriolis force, approximate the spectrum of turbulent convection by the Kolmogorov law, and couple this turbulence to the internal waves through their pressure fluctuations, following Press (1981) and Garc´ıa L´opez & Spruit (1991). The local frequency of an internal wave varies with depth in a differentially rotating star, and it can vanish at some location, thus leading to enhanced damping (Goldreich & Nicholson 1989). It is this dissipation mechanism only that we take into account in the exchange of momentum between waves and stellar rotation. The flux of angular momentum is then an implicit function of depth, involving the local rotation rate and an integral representing the cumulative effect of radiative dissipation. We find that the efficiency of this transport process is rather high: it operates on a timescale of 107 years, and is probably responsible for the flat rotation profile which has been detected through helioseismology.EDP SciencesBiblioteca Digital do IPBZahn, Jean-PaulTalon, SuzanneMatias, José2013-03-26T09:40:38Z19971997-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10198/8290engZahn, Jean-Paul; Talon, Suzanne; Matias, José (1997). Angular momentum transport by internal waves in the solar interior. Astronomy & Astrophysics. ISSN 0004-6361. 322:1, p. 320-3280004-6361info: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:RCAAP2023-11-21T10:19:54Zoai:bibliotecadigital.ipb.pt:10198/8290Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:59:42.110096Repositório 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 |
Angular momentum transport by internal waves in the solar interior |
title |
Angular momentum transport by internal waves in the solar interior |
spellingShingle |
Angular momentum transport by internal waves in the solar interior Zahn, Jean-Paul Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
title_short |
Angular momentum transport by internal waves in the solar interior |
title_full |
Angular momentum transport by internal waves in the solar interior |
title_fullStr |
Angular momentum transport by internal waves in the solar interior |
title_full_unstemmed |
Angular momentum transport by internal waves in the solar interior |
title_sort |
Angular momentum transport by internal waves in the solar interior |
author |
Zahn, Jean-Paul |
author_facet |
Zahn, Jean-Paul Talon, Suzanne Matias, José |
author_role |
author |
author2 |
Talon, Suzanne Matias, José |
author2_role |
author author |
dc.contributor.none.fl_str_mv |
Biblioteca Digital do IPB |
dc.contributor.author.fl_str_mv |
Zahn, Jean-Paul Talon, Suzanne Matias, José |
dc.subject.por.fl_str_mv |
Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
topic |
Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
description |
The internal gravity waves of low frequency which are emitted at the base of the solar convection zone are able to extract angular momentum from the radiative interior. We evaluate this transport with some simplifying assumptions: we ignore the Coriolis force, approximate the spectrum of turbulent convection by the Kolmogorov law, and couple this turbulence to the internal waves through their pressure fluctuations, following Press (1981) and Garc´ıa L´opez & Spruit (1991). The local frequency of an internal wave varies with depth in a differentially rotating star, and it can vanish at some location, thus leading to enhanced damping (Goldreich & Nicholson 1989). It is this dissipation mechanism only that we take into account in the exchange of momentum between waves and stellar rotation. The flux of angular momentum is then an implicit function of depth, involving the local rotation rate and an integral representing the cumulative effect of radiative dissipation. We find that the efficiency of this transport process is rather high: it operates on a timescale of 107 years, and is probably responsible for the flat rotation profile which has been detected through helioseismology. |
publishDate |
1997 |
dc.date.none.fl_str_mv |
1997 1997-01-01T00:00:00Z 2013-03-26T09:40:38Z |
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/10198/8290 |
url |
http://hdl.handle.net/10198/8290 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Zahn, Jean-Paul; Talon, Suzanne; Matias, José (1997). Angular momentum transport by internal waves in the solar interior. Astronomy & Astrophysics. ISSN 0004-6361. 322:1, p. 320-328 0004-6361 |
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 |
EDP Sciences |
publisher.none.fl_str_mv |
EDP Sciences |
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 |
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1799135221882290176 |