@InProceedings{RempelChBeSzHaGoSi:2017:ObDeKi,
author = "Rempel, Erico L. and Chian, Abraham Chian-Long and Beron-Vera,
Francisco J. and Szanyi, Sandor and Haller, George and Gomes,
Tiago Francisco Pinheiro and Silva, Suzana S. A.",
affiliation = "{Instituto Tecnol{\'o}gico de Aeron{\'a}utica (ITA)} and
{Instituto Nacional de Pesquisas Espaciais (INPE)} and {University
of Miami} and Institute for Mechanical Systems, Department of
Mechanical and ETH and {Instituto Nacional de Pesquisas Espaciais
(INPE)} and {Instituto Tecnol{\'o}gico da Aeron{\'a}utica
(ITA)}",
title = "Objective detection of kinematic and magnetic vortices in
astrophysical plasmas",
year = "2017",
organization = "SIAM Conference on Applications of Dynamical Systems",
abstract = "Previous works have demonstrated that the technique of hyperbolic
Lagrangian coherent structures is useful for analyzing the
dynamics of velocity and magnetic fields in numerical simulations
and satellite observations of astrophysical plasmas such as solar
photospheric turbulence. An accurate detection of the boundary of
coherent structures in velocity and magnetic fields of a plasma is
fundamental for the study of astrophysical turbulence, for
example, the determination of the front and rear boundary layers
of magnetic flux ropes in the solar wind is essential for locating
the preferential sites for the genesis of interplanetary
intermittent turbulence. In this work we apply the approach of
rotational Lagrangian coherent structures to detect kinematic
vortices in 3D magnetohydrodynamic simulations of an astrophysical
dynamo. The objective kinematic vortices are given by tubular
level surfaces of the Lagrangian Averaged Vorticity Deviation
(LAVD), the trajectory integral of the normed difference of the
vorticity from its spatial mean. In addition, we adapt the LAVD
technique to use it on magnetic fields and propose the method of
Integrated Averaged Current Deviation (IACD) to determine
precisely the boundary of magnetic vortices. The relevance of
objective kinematic and magnetic vortices in solar plasmas is
discussed.",
conference-location = "Snowbird, Utah, USA",
conference-year = "21-25 May",
language = "en",
urlaccessdate = "02 maio 2024"
}