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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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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0006-681B-8 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0006-681C-7
Genre: Zeitschriftenartikel

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 Urheber:
Chian, Abraham C-L, Autor
Silva, Suzana S A, Autor
Rempel, Erico L, Autor
Gošić, Milan, Autor
Rubio, Luis R Bellot, Autor
Kusano, Kanya, Autor
Miranda, Rodrigo A, Autor
Requerey, Iker S1, Autor
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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 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2019
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1093/mnras/stz1909
 Art des Abschluß: -

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Titel: Monthly Notices of the Royal Astronomical Society
  Andere : Mon. Not. R. Astron. Soc.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Oxford : Oxford University Press
Seiten: - Band / Heft: 488 (3) Artikelnummer: - Start- / Endseite: 3076 - 3088 Identifikator: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150