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Abstract:

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.

Registro:

Documento: Artículo
Título:Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence
Autor:González, C.A.; Dmitruk, P.; Mininni, P.D.; Matthaeus, W.H.
Filiación:Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, IFIBA, CONICET, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, United States
Palabras clave:acceleration of particles; magnetohydrodynamics (MHD); turbulence
Año:2017
Volumen:850
Número:1
DOI: http://dx.doi.org/10.3847/1538-4357/aa8c02
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v850_n1_p_Gonzalez

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Citas:

---------- APA ----------
González, C.A., Dmitruk, P., Mininni, P.D. & Matthaeus, W.H. (2017) . Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence. Astrophysical Journal, 850(1).
http://dx.doi.org/10.3847/1538-4357/aa8c02
---------- CHICAGO ----------
González, C.A., Dmitruk, P., Mininni, P.D., Matthaeus, W.H. "Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence" . Astrophysical Journal 850, no. 1 (2017).
http://dx.doi.org/10.3847/1538-4357/aa8c02
---------- MLA ----------
González, C.A., Dmitruk, P., Mininni, P.D., Matthaeus, W.H. "Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence" . Astrophysical Journal, vol. 850, no. 1, 2017.
http://dx.doi.org/10.3847/1538-4357/aa8c02
---------- VANCOUVER ----------
González, C.A., Dmitruk, P., Mininni, P.D., Matthaeus, W.H. Test Particle Energization and the Anisotropic Effects of Dynamical MHD Turbulence. Astrophys. J. 2017;850(1).
http://dx.doi.org/10.3847/1538-4357/aa8c02