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  Global-scale equatorial Rossby waves as an essential component of solar internal dynamics

Löptien, B., Gizon, L., Birch, A., Schou, J., Proxauf, B., Duvall, T., et al. (2018). Global-scale equatorial Rossby waves as an essential component of solar internal dynamics. Nature astronomy, 2, 568-573. doi:10.1038/s41550-018-0460-x.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-A867-E Version Permalink: http://hdl.handle.net/21.11116/0000-0001-A868-D
Genre: Journal Article

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 Creators:
Löptien, Björn1, Author              
Gizon, Laurent1, Author              
Birch, Aaron1, Author              
Schou, Jesper1, Author              
Proxauf, Bastian1, 2, Author              
Duvall, Thomas1, Author              
Bogart, Richard S., Author
Christensen, Ulrich R.3, Author              
Affiliations:
1Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              
2IMPRS for Solar System Science at the University of Göttingen, Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1832290              
3Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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 Abstract: The Sun’s complex dynamics is controlled by buoyancy and rotation in the convection zone. Large-scale flows are dominated by vortical motions1 and appear to be weaker than expected in the solar interior2. One possibility is that waves of vorticity due to the Coriolis force, known as Rossby waves3 or r modes4, remove energy from convection at the largest scales5. However, the presence of these waves in the Sun is still debated. Here, we unambiguously discover and characterize retrograde-propagating vorticity waves in the shallow subsurface layers of the Sun at azimuthal wavenumbers below 15, with the dispersion relation of textbook sectoral Rossby waves. The waves have lifetimes of several months, well-defined mode frequencies below twice the solar rotational frequency, and eigenfunctions of vorticity that peak at the equator. Rossby waves have nearly as much vorticity as the convection at the same scales, thus they are an essential component of solar dynamics. We observe a transition from turbulence-like to wave-like dynamics around the Rhines scale6 of angular wavenumber of approximately 20. This transition might provide an explanation for the puzzling deficit of kinetic energy at the largest spatial scales.

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Language(s): eng - English
 Dates: 2018-07-092018
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1038/s41550-018-0460-x
 Degree: -

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Title: Nature astronomy
Source Genre: Journal
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Publ. Info: London : Springer Nature
Pages: - Volume / Issue: 2 Sequence Number: - Start / End Page: 568 - 573 Identifier: Other: 2397-3366
CoNE: https://pure.mpg.de/cone/journals/resource/2397-3366