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Near-surface shear layer of solar rotation: origin and significance

Published online by Cambridge University Press:  23 December 2024

Leonid L. Kitchatinov Open the ORCID record for Leonid L. Kitchatinov [Opens in a new window]
Leonid L. Kitchatinov*
Affiliation:
Institute of Solar-Terrestrial Physics, Lermontov Str. 126A, 664033, Irkutsk, Russia Pulkovo Astronomical Observatory, Pulkovskoe Sh. 65, 196140, St–Petersburg, Russia
*
[email protected]
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Abstract

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Helioseismology has discovered a thin layer beneath the solar surface where the rotation rate increases rapidly with depth. The normalized rotational shear in the upper 10 Mm of the layer is constant with latitude. Differential rotation theory explains such a rotational state by a radial-type anisotropy of the near-surface convection and a short correlation time of convective turbulence compared to the rotation period. The shear layer is the main driver of the global meridional circulation.

Keywords

Sun: interiorSun: rotationturbulence
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 54 - 58
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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