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  Objective Lagrangian Vortex Detection in the Solar Photosphere

de Souza e Almeida Silva, S., Rempel, E. L., Pinheiro Gomes, T. F., Requerey, I. S., & Chian, A.-C.-L. (2018). Objective Lagrangian Vortex Detection in the Solar Photosphere. The Astrophysical Journal Letters, 863(1): L2. doi:10.3847/2041-8213/aad180.

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Genre: Journal Article

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 Creators:
de Souza e Almeida Silva, Suzana , Author
Rempel, Erico Luiz, Author
Pinheiro Gomes, Tiago Francisco , Author
Requerey, Iker S.1, Author
Chian, Abrahamm C.-L., Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              

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Free keywords: convection; methods: data analysis; Sun: granulation; Sun: photosphere
 Abstract: Vortices in the solar photosphere can be linked to a wide range of events, such as small-scale solar eruptions, wave excitation, and heating of the upper part of the solar atmosphere. Despite their importance in solar physics, most of the current studies on photospheric vortices are based on methods that are not invariant under time-dependent translations and rotations of the reference frame and are Eulerian; i.e., they are based on single snapshots of a velocity field and, therefore, do not convey information on the true long-term motion of fluid particles on a time-varying field. Another issue with methods for vortex detection is that typically they provide false identifications in highly compressible flows. This Letter presents a novel criterion that effectively removes wrong detections based on the geometry of the streamlines of the displacement vector of fluid elements and can be readily applied to other astrophysical flows. The new criterion is applied to the Lagrangian-averaged vorticity deviation (LAVD), which is a recently developed frame invariant vortex detection method. The advantage of LAVD is that it delimits the vortices' outer boundaries precisely by following up the trajectories of fluid elements in space and time. The proposed method is compared with two other techniques using horizontal velocity fields extracted from Hinode satellite data.

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Language(s): eng - English
 Dates: 2018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/2041-8213/aad180
 Degree: -

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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
 Creator(s):
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 863 (1) Sequence Number: L2 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215