Lagrangian chaotic saddles and objective vortices in solar plasmas

DOI: 
10.1103/PhysRevE.102.060201
Publication date: 
03/12/2020
Main author: 
Chian A.C.L.
IAA authors: 
Rubio, Luis R.Bellot
Authors: 
Chian, Abraham C.L.;Silva, Suzana S.A.;Rempel, Erico L.;Rubio, Luis R.Bellot;Gošić, Milan;Kusano, Kanya;Park, Sung Hong
Journal: 
Physical Review E
Refereed: 
Yes
Publication type: 
Article
Volume: 
102.0
Pages: 
060201
Number: 
060201
Abstract: 
© 2020 American Physical Society. 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.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020PhRvE.102f0201C/abstract
ADS Bibcode: 
2020PhRvE.102f0201C