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Title: 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 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.
Authors:
;  [1] ; ;  [2] ;  [3] ;  [4] ;  [5]
  1. National Institute for Space Research (INPE), World Institute for Space Environment Research (WISER), P.O. Box 515, 12227-010 São José dos Campos-SP (Brazil)
  2. Observatoire de Paris, LESIA, CNRS, F-92190 Meudon (France)
  3. Department of Mechanical Engineering, University of California, Berkeley, CA 94720 (United States)
  4. Space Science Laboratory, University of California, Berkeley, CA 94720 (United States)
  5. Department of Mathematical Sciences, Durham University, Durham DH1 3LE (United Kingdom)
Publication Date:
OSTI Identifier:
22356984
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 786; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; COMPUTERIZED SIMULATION; CONCENTRATION RATIO; DEFORMATION; DETECTION; EXPANSION; LAGRANGIAN FUNCTION; LYAPUNOV METHOD; MAGNETIC FIELDS; MAGNETIC FLUX; MAGNETOHYDRODYNAMICS; PHOTOSPHERE; PLAGES; SOLAR WIND; SUN; TELESCOPES; TURBULENCE; TURBULENT FLOW; VELOCITY