DETECTION OF COHERENT STRUCTURES IN PHOTOSPHERIC TURBULENT FLOWS

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...

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Bibliographic Details
Published in:The Astrophysical journal 2014-05, Vol.786 (1), p.1-13
Main Authors: Chian, Abraham C-L, Rempel, Erico L, Aulanier, Guillaume, Schmieder, Brigitte, Shadden, Shawn C, Welsch, Brian T, Yeates, Anthony R
Format: Article
Language:English
Subjects:
ABUNDANCE
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Coherence
Computation
Computational fluid dynamics
Computer simulation
COMPUTERIZED SIMULATION
CONCENTRATION RATIO
DEFORMATION
DETECTION
EXPANSION
LAGRANGIAN FUNCTION
Lyapunov exponents
LYAPUNOV METHOD
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETOHYDRODYNAMICS
PHOTOSPHERE
Physics
PLAGES
Solar optical telescope
SOLAR WIND
SUN
TELESCOPES
TURBULENCE
TURBULENT FLOW
VELOCITY
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Summary: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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/786/1/51