Lagrangian coherent structures in space plasmas

EL Rempel, ACL Chian, S de SA Silva, V Fedun… - Reviews of Modern …, 2023 - Springer
Abstract Space plasmas can be described as conducting flows in a turbulent state, where
fluid motion is determined by a host of kinetic and magnetic coherent structures of different …

Evolution, structure, and topology of self-generated turbulent reconnection layers

R Beg, AJB Russell, G Hornig - The Astrophysical Journal, 2022 - iopscience.iop.org
We present a 3D MHD simulation of two merging flux ropes exhibiting self-generated and
self-sustaining turbulent reconnection (SGTR) that is fully 3D and fast. The exploration of …

Magnetohydrodynamics modelling successfully predicts new helical states in reversed-field pinch fusion plasmas

M Veranda, D Bonfiglio, S Cappello, DF Escande… - Nuclear …, 2017 - iopscience.iop.org
Nonlinear fluid modelling predictions of qualitatively new self-organized helical states in the
reversed-field pinch configuration are confirmed by experiments in the RFX-mod device. The …

Role of the edge electric field in the resonant mode-particle interactions and the formation of transport barriers in toroidal plasmas

G Anastassiou, P Zestanakis, Y Antonenas… - Journal of Plasma …, 2024 - cambridge.org
The impact of an edge radial electric field on the particle orbits and the orbital spectrum in an
axisymmetric toroidal magnetic equilibrium is investigated using a guiding centre canonical …

[HTML][HTML] Analysis of the nonlinear dynamics of a chirping-frequency Alfvén mode in a tokamak equilibrium

X Wang, S Briguglio, C Di Troia, M Falessi… - Physics of …, 2022 - pubs.aip.org
Chirping Alfvén modes are considered as potentially harmful for the confinement of
energetic particles in burning tokamak plasmas. In fact, by changing their frequency, they …

Shearless bifurcations in particle transport for reversed-shear tokamaks

GC Grime, M Roberto, RL Viana, Y Elskens… - Journal of Plasma …, 2023 - cambridge.org
Some internal transport barriers in tokamaks have been related to the vicinity of extrema of
the plasma equilibrium profiles. This effect is numerically investigated by considering the …

Coherent magnetic structures in self-organized plasmas

F Pegoraro, D Bonfiglio, S Cappello… - Plasma Physics and …, 2019 - iopscience.iop.org
The concept of Lagrangian coherent structures (LCS) has been recently applied to complex
magnetic configurations in plasmas in order to find and characterize their main structural …

Supergranular turbulence in the quiet Sun: Lagrangian coherent structures

ACL Chian, SSA Silva, EL Rempel… - Monthly Notices of …, 2019 - academic.oup.com
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 …

Objective vortex detection in an astrophysical dynamo

EL Rempel, ACL Chian, FJ Beron-Vera… - Monthly Notices of …, 2017 - academic.oup.com
A novel technique for detecting Lagrangian vortices is applied to a helical
magnetohydrodynamic dynamo simulation. The vortices are given by tubular level surfaces …

Nonlinear physics and energetic particle transport features of the beam–plasma instability

N Carlevaro, MV Falessi, G Montani… - Journal of Plasma …, 2015 - cambridge.org
In this paper we study transport features of a one-dimensional beam–plasma system in the
presence of multiple resonances. As a model description of the general problem of a warm …