Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/110088
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Type: Journal article
Title: Detection of coherent structures in photospheric turbulent flows
Author: Chian, A.
Rempel, E.
Aulanier, G.
Schmieder, B.
Shadden, S.
Welsch, B.
Yeates, A.
Citation: The Astrophysical Journal: an international review of astronomy and astronomical physics, 2014; 786(1):51-1-51-13
Publisher: IOP Publishing
Issue Date: 2014
ISSN: 0004-637X
1538-4357
Statement of
Responsibility: 
Abraham C.-L. Chian, Erico L. Rempel, Guillaume Aulanier, Brigitte Schmieder, Shawn C. Shadden, Brian T. Welsch and Anthony R. Yeates
Abstract: We study coherent structures in solar photospheric flows in a plage in the vicinity of the active regionAR10930 using the horizontal velocity data derived from Hinode/Solar Optical Telescope magnetograms. Eulerian and Lagrangian coherent structures (LCSs) are detected by computing the Q-criterion and the finite-time Lyapunov exponents of the velocity field, respectively. Our analysis indicates that, on average, the deformation Eulerian coherent structures dominate over the vortical Eulerian coherent structures in the plage region. We demonstrate the correspondence of the network of high magnetic flux concentration to the attracting Lagrangian coherent structures (aLCSs) in the photospheric velocity based on both observations and numerical simulations. In addition, the computation of aLCS provides a measure of the local rate of contraction/expansion of the flow.
Keywords: Magnetohydrodynamics (MHD); sun: magnetic fields; sun: photosphere; turbulence
Rights: © 2014. The American Astronomical Society. All rights reserved.
DOI: 10.1088/0004-637X/786/1/51
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Mathematical Sciences publications

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