Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence

In this paper, we analyze the effect of dynamical three-dimensional magnetohydrodynamic (MHD) turbulence on test particle acceleration and compare how this evolving system affects particle energization by current sheet interaction, as opposed to frozen-in-time fields. To do this, we analyze the ense...

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Detalles Bibliográficos
Publicado: 2017
Materias:
acceleration of particles
magnetohydrodynamics (MHD)
turbulence
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v850_n1_p_Gonzalez
http://hdl.handle.net/20.500.12110/paper_0004637X_v850_n1_p_Gonzalez
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_0004637X_v850_n1_p_Gonzalez
record_format dspace
spelling paper:paper_0004637X_v850_n1_p_Gonzalez2023-06-08T14:29:20Z Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence acceleration of particles magnetohydrodynamics (MHD) turbulence In this paper, we analyze the effect of dynamical three-dimensional magnetohydrodynamic (MHD) turbulence on test particle acceleration and compare how this evolving system affects particle energization by current sheet interaction, as opposed to frozen-in-time fields. To do this, we analyze the ensemble particle acceleration for static electromagnetic fields extracted from direct numerical simulations of the MHD equations, and compare it with the dynamical fields. We show that a reduction in particle acceleration in the dynamical model results from particle trapping in field lines, which forces the particles to be advected by the flow and suppresses long exposures to the strong electric field gradients that take place between structures and generate (among other effects) an efficient particle acceleration in the static case. In addition, we analyze the effect of anisotropy caused by the mean magnetic field. It is well known that for sufficiently strong external fields, the system experiences a transition toward a two-dimensional flow. This causes an increment in the size of the coherent structures, resulting in a magnetized state of the particles and a reduction in particle energization. © 2017. The American Astronomical Society. All rights reserved. 2017 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v850_n1_p_Gonzalez http://hdl.handle.net/20.500.12110/paper_0004637X_v850_n1_p_Gonzalez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic acceleration of particles
magnetohydrodynamics (MHD)
turbulence
spellingShingle acceleration of particles
magnetohydrodynamics (MHD)
turbulence
Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence
topic_facet acceleration of particles
magnetohydrodynamics (MHD)
turbulence
description In this paper, we analyze the effect of dynamical three-dimensional magnetohydrodynamic (MHD) turbulence on test particle acceleration and compare how this evolving system affects particle energization by current sheet interaction, as opposed to frozen-in-time fields. To do this, we analyze the ensemble particle acceleration for static electromagnetic fields extracted from direct numerical simulations of the MHD equations, and compare it with the dynamical fields. We show that a reduction in particle acceleration in the dynamical model results from particle trapping in field lines, which forces the particles to be advected by the flow and suppresses long exposures to the strong electric field gradients that take place between structures and generate (among other effects) an efficient particle acceleration in the static case. In addition, we analyze the effect of anisotropy caused by the mean magnetic field. It is well known that for sufficiently strong external fields, the system experiences a transition toward a two-dimensional flow. This causes an increment in the size of the coherent structures, resulting in a magnetized state of the particles and a reduction in particle energization. © 2017. The American Astronomical Society. All rights reserved.
title Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence
title_short Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence
title_full Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence
title_fullStr Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence
title_full_unstemmed Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence
title_sort test particle energization and the anisotropic effects of dynamical mhd turbulence
publishDate 2017
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v850_n1_p_Gonzalez
http://hdl.handle.net/20.500.12110/paper_0004637X_v850_n1_p_Gonzalez
_version_ 1768543400143880192

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