Origin of the Near-Surface Shear Layer of Solar Rotation
Fuente:
arXiv
Salvato in:
| Autore principale: | |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2024
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866917587607093248 |
|---|---|
| author | Kitchatinov, Leonid |
| author_facet | Kitchatinov, Leonid |
| contents | Helioseismology has revealed an increase in the rotation rate with depth in a thin ($\sim$30 Mm) near-surface layer. The normalized rotational shear in this layer is independent of latitude. This rotational state is shown to be a consequence of the short characteristic time of near-surface convection compared to the rotation period, and the radial anisotropy of the convective turbulence. Analytical derivations within mean-field hydrodynamics reproduce the observed normalized rotational shear and are in agreement with numerical experiments on the radiative hydrodynamics of solar convection. The near-surface shear layer is the source of the global meridional flow important for the solar dynamo. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_07421 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Origin of the Near-Surface Shear Layer of Solar Rotation Kitchatinov, Leonid Solar and Stellar Astrophysics Helioseismology has revealed an increase in the rotation rate with depth in a thin ($\sim$30 Mm) near-surface layer. The normalized rotational shear in this layer is independent of latitude. This rotational state is shown to be a consequence of the short characteristic time of near-surface convection compared to the rotation period, and the radial anisotropy of the convective turbulence. Analytical derivations within mean-field hydrodynamics reproduce the observed normalized rotational shear and are in agreement with numerical experiments on the radiative hydrodynamics of solar convection. The near-surface shear layer is the source of the global meridional flow important for the solar dynamo. |
| title | Origin of the Near-Surface Shear Layer of Solar Rotation |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2402.07421 |