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
Autores principales:	González, C.A., Dmitruk, P., Mininni, P.D., Matthaeus, W.H.
Formato:	JOUR
Materias:	acceleration of particles magnetohydrodynamics (MHD) turbulence
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_0004637X_v850_n1_p_Gonzalez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_0004637X_v850_n1_p_Gonzalez
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spelling	todo:paper_0004637X_v850_n1_p_Gonzalez2023-10-03T14:02:43Z Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence González, C.A. Dmitruk, P. Mininni, P.D. Matthaeus, W.H. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 González, C.A. Dmitruk, P. Mininni, P.D. Matthaeus, W.H. 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.
format	JOUR
author	González, C.A. Dmitruk, P. Mininni, P.D. Matthaeus, W.H.
author_facet	González, C.A. Dmitruk, P. Mininni, P.D. Matthaeus, W.H.
author_sort	González, C.A.
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
url	http://hdl.handle.net/20.500.12110/paper_0004637X_v850_n1_p_Gonzalez
work_keys_str_mv	AT gonzalezca testparticleenergizationandtheanisotropiceffectsofdynamicalmhdturbulence AT dmitrukp testparticleenergizationandtheanisotropiceffectsofdynamicalmhdturbulence AT mininnipd testparticleenergizationandtheanisotropiceffectsofdynamicalmhdturbulence AT matthaeuswh testparticleenergizationandtheanisotropiceffectsofdynamicalmhdturbulence
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Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence

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