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Observational Study of Reynolds Stresses Associated with Solar Inertial Modes

Published online by Cambridge University Press:  23 December 2024

Yash Mandowara Open the ORCID record for Yash Mandowara [Opens in a new window] ,
Yuto Bekki ,
Richard S. Bogart  and
Laurent Gizon Open the ORCID record for Laurent Gizon [Opens in a new window]
Yash Mandowara
Affiliation:
Max–Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany
Yuto Bekki
Affiliation:
Max–Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany
Richard S. Bogart
Affiliation:
Stanford University, Stanford, CA 94305-4085, USA
Laurent Gizon
Affiliation:
Max–Planck-Institut für Sonnensystemforschung, 37077 Göttingen, Germany Institut für Astrophysik, Georg–August-Universität Göttingen, 37077 Göttingen, Germany
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Abstract

We study the m = 1 high-latitude inertial mode and its contribution to the latitudinal transport of the Sun’s angular momentum. Ring-diagram helioseismology applied to 5° tiles is used to obtain the horizontal flows near the surface of the Sun. Using 10 years of data from SDO/HMI, we report on the horizontal eigenfunction and Reynolds stress $\[{Q_{\theta \phi }} = \langle {u'_\theta }{u'_\phi }\rangle \]$ for the m = 1 high-latitude inertial mode (frequency –86.3 nHz, critical latitudes ±58°). We find that Qθφ takes significant values above the critical latitude and is positive (negative) in the northern (southern) hemisphere, implying equatorward transport of angular momentum. The Qθφ peaks above latitude 70° with a value of 38 m2/s2.

Keywords

Solar inertial modessolar oscillationshelioseismologysolar rotation
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. 235 - 239
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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