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http://hdl.handle.net/1843/62231| Tipo: | Artigo de Periódico |
| Título: | Are tachoclines important for solar and stellar dynamos? What can we learn from global simulations |
| Autor(es): | Gustavo Andres Guerrero Eraso Piotr Krzysztof Smolarkiewicz Elisabete Maria de Gouveia Dal Pino Alexander G. Kosovichev Bonnie Romano Zaire Nagi Nicolas Mansour |
| Resumo: | The role of tachoclines, the thin shear layers that separate solid body from differential rotation in the interior of late-type stars, in stellar dynamos is still controversial. In this work we discuss their relevance in view of recent results from global dynamo simulations performed with the EULAG-MHD code. The models have solar-like stratification and different rotation rates (i.e., different Rossby number). Three arguments supporting the key role of tachoclines are presented: the solar dynamo cycle period, the origin of torsional oscillations and the scaling law of stellar magnetic fields as function of the Rossby number. This scaling shows a regime where the field strength increases with the rotation and a saturated regime for fast rotating stars. These properties are better reproduced by models that consider the convection zone and a fraction of the radiative core, naturally developing a tachocline, than by those that consider only the convection zone. |
| Assunto: | Estrelas |
| Idioma: | eng |
| País: | Brasil |
| Editor: | Universidade Federal de Minas Gerais |
| Sigla da Instituição: | UFMG |
| Departamento: | ICX - DEPARTAMENTO DE FÍSICA |
| Tipo de Acesso: | Acesso Aberto |
| Identificador DOI: | https://doi.org/10.1017/S1743921317003982 |
| URI: | http://hdl.handle.net/1843/62231 |
| Data do documento: | 2017 |
| metadata.dc.url.externa: | https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/are-tachoclines-important-for-solar-and-stellar-dynamos-what-can-we-learn-from-global-simulations/E7627CA42D7B5418141883E958CECDB8 |
| metadata.dc.relation.ispartof: | Proceedings of the International Astronomical Union |
| Aparece nas coleções: | Artigo de Periódico |
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| are-tachoclines-important-for-solar-and-stellar-dynamos-what-can-we-learn-from-global-simulations.pdf | 1.23 MB | Adobe PDF | Visualizar/Abrir |
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