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  Supergranular turbulence in the quiet Sun: Lagrangian coherent structures

Chian, A.-C.-L., Silva, S. S. A., Rempel, E. L., Gošić, M., Rubio, L. R. B., Kusano, K., et al. (2019). Supergranular turbulence in the quiet Sun: Lagrangian coherent structures. Monthly Notices of the Royal Astronomical Society, 488(3), 3076-3088. doi:10.1093/mnras/stz1909.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0006-681B-8 Version Permalink: https://hdl.handle.net/21.11116/0000-0006-681C-7
Genre: Journal Article

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 Creators:
Chian, Abraham C-L, Author
Silva, Suzana S A, Author
Rempel, Erico L, Author
Gošić, Milan, Author
Rubio, Luis R Bellot, Author
Kusano, Kanya, Author
Miranda, Rodrigo A, Author
Requerey, Iker S1, Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              

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 Abstract: The quiet Sun exhibits a wealth of magnetic activities that are fundamental for our understanding of solar magnetism. The magnetic fields in the quiet Sun are observed to evolve coherently, interacting with each other to form prominent structures as they are advected by photospheric flows. The aim of this paper is to study supergranular turbulence by detecting Lagrangian coherent structures (LCS) based on the horizontal velocity fields derived from Hinode intensity images at disc centre of the quiet Sun on 2010 November 2. LCS act as transport barriers and are responsible for attracting/repelling the fluid elements and swirling motions in a finite time. Repelling/attracting LCS are found by computing the forward/backward finite-time Lyapunov exponent (FTLE), and vortices are found by the Lagrangian-averaged vorticity deviation method. We show that the Lagrangian centres and boundaries of supergranular cells are given by the local maximum of the forward and backward FTLE, respectively. The attracting LCS expose the location of the sinks of photospheric flows at supergranular junctions, whereas the repelling LCS interconnect the Lagrangian centres of neighbouring supergranular cells. Lagrangian transport barriers are found within a supergranular cell and from one cell to other cells, which play a key role in the dynamics of internetwork and network magnetic elements. Such barriers favour the formation of vortices in supergranular junctions. In particular, we show that the magnetic field distribution in the quiet Sun is determined by the combined action of attracting/repelling LCS and vortices.

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Language(s): eng - English
 Dates: 2019
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz1909
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 488 (3) Sequence Number: - Start / End Page: 3076 - 3088 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150