Supergranular turbulence in the quiet Sun: Lagrangian coherent structures
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- Abraham C-L Chian
- School of Mathematical Sciences, University of Adelaide, Adelaide, SA 5005, Australia
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- Suzana S A Silva
- Institute of Aeronautical Technology (ITA), World Institute for Space Environment Research (WISER), São José dos Campos, SP 12228-900, Brazil
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- Erico L Rempel
- National Institute for Space Research (INPE), PO Box 515, São José dos Campos, SP 12227-010, Brazil
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- Milan Gošić
- Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA 94304, USA
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- Luis R Bellot Rubio
- Instituto de Astrofísica de Andalucía (CSIC), Apdo. de Correos 3004, E-18080 Granada, Spain
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- Kanya Kusano
- Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
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- Rodrigo A Miranda
- UnB-Gama Campus, University of Brasília (UnB), Brasília DF 70910-900, Brazil
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- Iker S Requerey
- Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, D-37077 Göttingen, Germany
書誌事項
- 公開日
- 2019-07-11
- 資源種別
- journal article
- 権利情報
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- https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model
- DOI
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- 10.1093/mnras/stz1909
- 10.48550/arxiv.1904.08472
- 公開者
- Oxford University Press (OUP)
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説明
<jats:title>ABSTRACT</jats:title> <jats:p>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.</jats:p>
収録刊行物
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- Monthly Notices of the Royal Astronomical Society
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Monthly Notices of the Royal Astronomical Society 488 (3), 3076-3088, 2019-07-11
Oxford University Press (OUP)
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詳細情報 詳細情報について
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- CRID
- 1360849944528770944
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- ISSN
- 13652966
- 00358711
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- 資料種別
- journal article
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- データソース種別
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- KAKEN
- OpenAIRE