@Article{ChianSRGRKMR:2019:LaCoSt,
author = "Chian, Abraham Chian Long and Silva, Suzana S. A. and Rempel,
Erico Luiz and Gosic, Milan and Rubio, Luis R. Bellot and Kusano,
Kanya and Miranda, Rodrigo A. and Requerey, Iker S.",
affiliation = "{} and {} and {Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Supergranular turbulence in the quiet Sun: Lagrangian coherent
structures",
journal = "Monthly Notices of the Royal Astronomical Society",
year = "2019",
volume = "488",
number = "3",
pages = "3076--3088",
month = "Sept.",
keywords = "chaos, magnetic fields, turbulence, Sun: granulation, Sun:
photosphere.",
abstract = "The quiet Sun exhibits a wealth of magnetic activities that are
fundamental for our understanding of solar magnetism. The magnetic
fields in the quiet Sun are observed to evolve coherently,
interacting with each other to form prominent structures as they
are advected by photospheric flows. The aim of this paper is to
study supergranular turbulence by detecting Lagrangian coherent
structures (LCS) based on the horizontal velocity fields derived
from Hinode intensity images at disc centre of the quiet Sun on
2010 November 2. LCS act as transport barriers and are responsible
for attracting/repelling the fluid elements and swirling motions
in a finite time. Repelling/attracting LCS are found by computing
the forward/backward finite-time Lyapunov exponent (FTLE), and
vortices are found by the Lagrangian-averaged vorticity deviation
method. We show that the Lagrangian centres and boundaries of
supergranular cells are given by the local maximum of the forward
and backward FTLE, respectively. The attracting LCS expose the
location of the sinks of photospheric flows at supergranular
junctions, whereas the repelling LCS interconnect the Lagrangian
centres of neighbouring supergranular cells. Lagrangian transport
barriers are found within a supergranular cell and from one cell
to other cells, which play a key role in the dynamics of
internetwork and network magnetic elements. Such barriers favour
the formation of vortices in supergranular junctions. In
particular, we show that the magnetic field distribution in the
quiet Sun is determined by the combined action of
attracting/repelling LCS and vortices. Palavras-chave.",
doi = "10.1093/mnras/stz1909",
url = "http://dx.doi.org/10.1093/mnras/stz1909",
issn = "0035-8711 and 1365-2966",
language = "en",
targetfile = "stz1909.pdf",
urlaccessdate = "28 mar. 2024"
}