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A Frequency-Dependent Method for Measuring the Sun’s Interior Meridional Circulation

Published online by Cambridge University Press:  23 December 2024

Ruizhu Chen Open the ORCID record for Ruizhu Chen [Opens in a new window]  and
Junwei Zhao
Ruizhu Chen*
Affiliation:
W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA
Junwei Zhao
Affiliation:
W. W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA
*
email: rzchen@stanford.edu
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Abstract

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The Sun’s meridional circulation is a crucial component for understanding the Sun’s dynamo and its interior dynamics. However, the determination of meridional circulation is affected by a systematic center-to-limb (CtoL) effect, which introduces systematic errors 5–10 times stronger than the meridional-flow-induced travel-time shifts in deep-flow measurements. Recently, it was found that the CtoL effect has a significant acoustic-frequency dependence, while flow-induced travel-time shifts show little frequency dependence (Chen & Zhao 2018). This discovery forms the basis for designing a new method to remove the CtoL effect. We therefore propose a frequency-dependent approach to measure the CtoL effect and the flow-induced signals in the Fourier domain. In this work, we present this new method and compare time–distance measurements in different frequency bands with those obtained by previous time-domain methods. The results demonstrate consistency with conventional time-domain fitting methods in the dominant frequency range, promising the potential for conducting meridional flow inversion across a broader frequency spectrum.

Keywords

Sun: helioseismologySun: interiorSun: oscillations
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. 36 - 40
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Creative Commons
Creative Common License - CCCreative Common License - BYCreative Common License - NCCreative Common License - SA
This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http://creativecommons.org/licenses/by-nc-sa/4.0), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is used to distribute the re-used or adapted article and the original article is properly cited. The written permission of Cambridge University Press must be obtained prior to any commercial use.
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

References

Chen, R., & Zhao, J. 2017, Astrophys. J., 849, 144 CrossRefGoogle Scholar
Chen, R., & Zhao, J. 2018, Astrophys. J., 853, 161.CrossRefGoogle Scholar
Duvall, T. L. Jr, Jefferies, S. M., Harvey, J. W., & Pomerantz, M. A. 1993, Nature, 362, 430 CrossRefGoogle Scholar
Gizon, L., Cameron, R. H., Pourabdian, M., et al. 2020, Science, 368, 1469.CrossRefGoogle Scholar
Gizon, L., Schunker, H., Baldner, C. S., et al. 2009, Space Sci. Rev., 144, 249.CrossRefGoogle Scholar
Hartlep, T., & Zhao, J. 2021, Astrophys. J., 909, 66.CrossRefGoogle Scholar
Jackiewicz, J., Serebryanskiy, A., & Kholikov, S. 2015, Astrophys. J., 805, 133 CrossRefGoogle Scholar
Kholikov, S., Serebryanskiy, A., & Jackiewicz, J. 2014, Astrophys. J., 784, 145 CrossRefGoogle Scholar
Liang, Z.-C., Birch, A. C., Duvall, T. L. Jr., Gizon, L., & Schou, J. 2017, A&A, 601, A46 Google Scholar
Liang, Z.-C., & Chou, D.-Y. 2015a, Astrophys. J., 805, 165 CrossRefGoogle Scholar
Liang, Z.-C., & Chou, D.-Y. 2015b, Astrophys. J., 809, 150 CrossRefGoogle Scholar
Rajaguru, S. P., & Antia, H. M. 2015, Astrophys. J., 813, 114 CrossRefGoogle Scholar
Rajaguru, S. P. & Antia, H. M. 2020, Dynamics of the Sun and Stars; Honoring the Life and Work of Michael J. Thompson, 57, 107.CrossRefGoogle Scholar
Zhao, J., Bogart, R. S., Kosovichev, A. G., Duvall, T. L. Jr., Hartlep, T. 2013, Astrophys. J. Letters, 774, L29 CrossRefGoogle Scholar
Zhao, J., Nagashima, K., Bogart, R. S., Kosovichev, A. G., Duvall, T. L. Jr. 2012, Astrophys. J. Letters, 749, L5 CrossRefGoogle Scholar