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  Predicting frequency changes of global-scale solar Rossby modes due to solar cycle changes in internal rotation

Goddard, C., Birch, A., Fournier, D., & Gizon, L. (2020). Predicting frequency changes of global-scale solar Rossby modes due to solar cycle changes in internal rotation. Astronomy and Astrophysics, 640: L10. doi:10.1051/0004-6361/202038539.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0006-F99D-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-F99E-0
Genre: Journal Article

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 Creators:
Goddard, Christopher1, Author              
Birch, Aaron1, Author              
Fournier, Damien1, Author              
Gizon, Laurent1, Author              
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              

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 Abstract: Context. Large-scale equatorial Rossby modes have been observed on the Sun over the last two solar cycles. Aims. We investigate the impact of the time-varying zonal flows on the frequencies of Rossby modes. Methods. A first-order perturbation theory approach is used to obtain an expression for the expected shift in the mode frequencies due to perturbations in the internal rotation rate. Results. Using the time-varying rotation from helioseismic inversions we predict the changes in Rossby mode frequencies with azimuthal orders from m = 1 to m = 15 over the last two solar cycles. The peak-to-peak frequency change is less than 1 nHz for the m = 1 mode, grows with m, and reaches 25 nHz for m = 15. Conclusions. Given the observational uncertainties on mode frequencies due to the finite mode lifetimes, we find that the predicted frequency shifts are near the limit of detectability.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/202038539
 Degree: -

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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: 8 Volume / Issue: 640 Sequence Number: L10 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1