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Detection of coherent structures in photospheric turbulent flows

Chian, A.C.-L.; Rempel, E.L.; Aulanier, G.; Schmieder, B.; Shadden, S.C.; Welsch, B.T.; Yeates, A.R.

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A.C.-L. Chian

E.L. Rempel

G. Aulanier

B. Schmieder

S.C. Shadden

B.T. Welsch


We study coherent structures in solar photospheric flows in a plage in the vicinity of the active region AR 10930 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.


Chian, A., Rempel, E., Aulanier, G., Schmieder, B., Shadden, S., Welsch, B., & Yeates, A. (2014). Detection of coherent structures in photospheric turbulent flows. Astrophysical Journal, 786(1),

Journal Article Type Article
Publication Date Apr 1, 2014
Deposit Date Apr 17, 2014
Publicly Available Date Sep 8, 2014
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 786
Issue 1
Keywords Magnetohydrodynamics (MHD), Sun: magnetic fields, Sun: photosphere, turbulence.


Published Journal Article (3.5 Mb)

Copyright Statement
© 2014. The American Astronomical Society. All rights reserved.

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