Chian, A.C.-L. and Rempel, E.L. and Aulanier, G. and Schmieder, B. and Shadden, S.C. and Welsch, B.T. and Yeates, A.R. (2014) 'Detection of coherent structures in photospheric turbulent flows.', Astrophysical journal., 786 (1). p. 51.
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.
|Keywords:||Magnetohydrodynamics (MHD), Sun: magnetic fields, Sun: photosphere, turbulence.|
|Full text:||(VoR) Version of Record|
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|Publisher Web site:||http://dx.doi.org/10.1088/0004-637X/786/1/51|
|Publisher statement:||© 2014. The American Astronomical Society. All rights reserved.|
|Date accepted:||No date available|
|Date deposited:||08 September 2014|
|Date of first online publication:||April 2014|
|Date first made open access:||No date available|
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