Publicação
Angular momentum transport by internal waves in the solar interior
| 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. |
|---|---|
| Autores principais: | Zahn, Jean-Paul |
| Outros Autores: | Talon, Suzanne; Matias, José |
| Assunto: | Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
| Ano: | 1997 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| _version_ | 1867172853212774400 |
|---|---|
| author | Zahn, Jean-Paul |
| author2 | Talon, Suzanne Matias, José |
| author2_role | author author |
| author_facet | Zahn, Jean-Paul Talon, Suzanne Matias, José |
| author_role | author |
| contributor_name_str_mv | Biblioteca Digital do IPB |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Zahn, Jean-Paul\"},{\"Person.name\":\"Talon, Suzanne\"},{\"Person.name\":\"Matias, José\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Biblioteca Digital do IPB |
| datacite.creators.creator.creatorName.fl_str_mv | Zahn, Jean-Paul Talon, Suzanne Matias, José |
| datacite.date.Accepted.fl_str_mv | 1997-01-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2013-03-26T09:40:38Z |
| datacite.date.embargoed.fl_str_mv | 2013-03-26T09:40:38Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
| datacite.titles.title.fl_str_mv | Angular momentum transport by internal waves in the solar interior |
| dc.contributor.none.fl_str_mv | Biblioteca Digital do IPB |
| dc.creator.none.fl_str_mv | Zahn, Jean-Paul Talon, Suzanne Matias, José |
| dc.date.Accepted.fl_str_mv | 1997-01-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2013-03-26T09:40:38Z |
| dc.date.embargoed.fl_str_mv | 2013-03-26T09:40:38Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | http://hdl.handle.net/10198/8290 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | EDP Sciences |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
| dc.title.fl_str_mv | Angular momentum transport by internal waves in the solar interior |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| 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. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| fulltext.url.fl_str_mv | https://bibliotecadigital.ipb.pt/bitstreams/01bce7f8-b202-4258-8b11-94ec175eb38b/download |
| id | ipb_6f2e048c121c694bc2e7d3698a2fe4d6 |
| identifier.url.fl_str_mv | http://hdl.handle.net/10198/8290 |
| instacron_str | ipb |
| institution | Instituto Politécnico de Bragança |
| instname_str | Instituto Politécnico de Bragança |
| language | eng |
| network_acronym_str | ipb |
| network_name_str | Biblioteca Digital do IPB |
| oai_identifier_str | oai:bibliotecadigital.ipb.pt:10198/8290 |
| organization_str_mv | urn:organizationAcronym:ipb |
| person_str_mv | Zahn, Jean-Paul Talon, Suzanne Matias, José |
| publishDate | 1997 |
| publisher.none.fl_str_mv | EDP Sciences |
| reponame_str | Biblioteca Digital do IPB |
| repository_id_str | urn:repositoryAcronym:ipb |
| service_str_mv | urn:repositoryAcronym:ipb |
| spelling | engEDP SciencesporThe 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.application/pdfporAngular momentum transport by internal waves in the solar interiorZahn, Jean-PaulTalon, SuzanneMatias, JoséHostingInstitutionOrganizationalBiblioteca Digital do IPBe-mailmailto:dspace@ipb.ptdspace@ipb.ptISSNIsPartOf0004-63612013-03-26T09:40:38Z19971997-01-01T00:00:00ZHandlehttp://hdl.handle.net/10198/8290http://purl.org/coar/access_right/c_abf2open accessHydrodynamicsTurbulenceSun: interior: rotationStars: interiors: rotation26149 bytesliteraturehttp://purl.org/coar/resource_type/c_6501journal articlehttp://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://bibliotecadigital.ipb.pt/bitstreams/01bce7f8-b202-4258-8b11-94ec175eb38b/downloadAstronomy & Astrophysics322320328 |
| spellingShingle | Angular momentum transport by internal waves in the solar interior Zahn, Jean-Paul Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
| status | SINGLETON |
| subject.fl_str_mv | Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
| title | 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_short | Angular momentum transport by internal waves in the solar interior |
| title_sort | Angular momentum transport by internal waves in the solar interior |
| topic | Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
| topic_facet | Hydrodynamics Turbulence Sun: interior: rotation Stars: interiors: rotation |
| url | http://hdl.handle.net/10198/8290 |
| visible | 1 |