Lagrangian chaotic saddles and objective vortices in solar plasmas

We report observational evidence of Lagrangian chaotic saddles in plasmas, given by the intersections of finite-time unstable and stable manifolds, using an ≈22h sequence of spacecraft images of the horizontal velocity field of solar photosphere. A set of 29 persistent objective vortices with lifeti...

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Bibliographic Details
Published in:Physical review. E 2020-12, Vol.102 (6-1), p.060201-060201, Article 060201
Main Authors: Chian, Abraham C-L, Silva, Suzana S A, Rempel, Erico L, Rubio, Luis R Bellot, Gošić, Milan, Kusano, Kanya, Park, Sung-Hong
Format: Article
Language:English
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Summary:We report observational evidence of Lagrangian chaotic saddles in plasmas, given by the intersections of finite-time unstable and stable manifolds, using an ≈22h sequence of spacecraft images of the horizontal velocity field of solar photosphere. A set of 29 persistent objective vortices with lifetimes varying from 28.5 to 298.3 min are detected by computing the Lagrangian averaged vorticity deviation. The unstable manifold of the Lagrangian chaotic saddles computed for ≈11h exhibits twisted folding motions indicative of recurring vortices in a magnetic mixed-polarity region. We show that the persistent objective vortices are formed in the gap regions of Lagrangian chaotic saddles at supergranular junctions.
ISSN:2470-0045
2470-0053
DOI:10.1103/PhysRevE.102.060201