Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic

We analyze the effect of the Hall term in the magnetohydrodynamic turbulence under a strong externally supported magnetic field, seeing how this changes the energy cascade, the characteristic scales of the flow, and the dynamics of global magnitudes, with particular interest in the dissipation. Nume...

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Autores principales:	Martin, L.N., Dmitruk, P., Gomez, D.O.
Formato:	JOUR
Materias:	Current sheets Energy cascade Energy spectra Fundamental structures Hall magnetohydrodynamics Hall parameters Impulsive effects Internal structure Ion skin depth Macroscopic scale Magnetohydrodynamic turbulence Reduced magnetohydrodynamics Spatial structure Energy dissipation Hall effect Kinetic theory Magnetic fields Magnetohydrodynamics
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_1070664X_v19_n5_p_Martin
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_1070664X_v19_n5_p_Martin
record_format	dspace
spelling	todo:paper_1070664X_v19_n5_p_Martin2023-10-03T16:02:32Z Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic Martin, L.N. Dmitruk, P. Gomez, D.O. Current sheets Energy cascade Energy spectra Fundamental structures Hall magnetohydrodynamics Hall parameters Impulsive effects Internal structure Ion skin depth Macroscopic scale Magnetohydrodynamic turbulence Reduced magnetohydrodynamics Spatial structure Energy dissipation Hall effect Kinetic theory Magnetic fields Magnetohydrodynamics We analyze the effect of the Hall term in the magnetohydrodynamic turbulence under a strong externally supported magnetic field, seeing how this changes the energy cascade, the characteristic scales of the flow, and the dynamics of global magnitudes, with particular interest in the dissipation. Numerical simulations of freely evolving three-dimensional reduced magnetohydrodynamics are performed, for different values of the Hall parameter (the ratio of the ion skin depth to the macroscopic scale of the turbulence) controlling the impact of the Hall term. The Hall effect modifies the transfer of energy across scales, slowing down the transfer of energy from the large scales up to the Hall scale (ion skin depth) and carrying faster the energy from the Hall scale to smaller scales. The final outcome is an effective shift of the dissipation scale to larger scales but also a development of smaller scales. Current sheets (fundamental structures for energy dissipation) are affected in two ways by increasing the Hall effect, with a widening but at the same time generating an internal structure within them. In the case where the Hall term is sufficiently intense, the current sheet is fully delocalized. The effect appears to reduce impulsive effects in the flow, making it less intermittent. © 2012 American Institute of Physics. Fil:Dmitruk, P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gomez, D.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1070664X_v19_n5_p_Martin
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Current sheets Energy cascade Energy spectra Fundamental structures Hall magnetohydrodynamics Hall parameters Impulsive effects Internal structure Ion skin depth Macroscopic scale Magnetohydrodynamic turbulence Reduced magnetohydrodynamics Spatial structure Energy dissipation Hall effect Kinetic theory Magnetic fields Magnetohydrodynamics
spellingShingle	Current sheets Energy cascade Energy spectra Fundamental structures Hall magnetohydrodynamics Hall parameters Impulsive effects Internal structure Ion skin depth Macroscopic scale Magnetohydrodynamic turbulence Reduced magnetohydrodynamics Spatial structure Energy dissipation Hall effect Kinetic theory Magnetic fields Magnetohydrodynamics Martin, L.N. Dmitruk, P. Gomez, D.O. Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic
topic_facet	Current sheets Energy cascade Energy spectra Fundamental structures Hall magnetohydrodynamics Hall parameters Impulsive effects Internal structure Ion skin depth Macroscopic scale Magnetohydrodynamic turbulence Reduced magnetohydrodynamics Spatial structure Energy dissipation Hall effect Kinetic theory Magnetic fields Magnetohydrodynamics
description	We analyze the effect of the Hall term in the magnetohydrodynamic turbulence under a strong externally supported magnetic field, seeing how this changes the energy cascade, the characteristic scales of the flow, and the dynamics of global magnitudes, with particular interest in the dissipation. Numerical simulations of freely evolving three-dimensional reduced magnetohydrodynamics are performed, for different values of the Hall parameter (the ratio of the ion skin depth to the macroscopic scale of the turbulence) controlling the impact of the Hall term. The Hall effect modifies the transfer of energy across scales, slowing down the transfer of energy from the large scales up to the Hall scale (ion skin depth) and carrying faster the energy from the Hall scale to smaller scales. The final outcome is an effective shift of the dissipation scale to larger scales but also a development of smaller scales. Current sheets (fundamental structures for energy dissipation) are affected in two ways by increasing the Hall effect, with a widening but at the same time generating an internal structure within them. In the case where the Hall term is sufficiently intense, the current sheet is fully delocalized. The effect appears to reduce impulsive effects in the flow, making it less intermittent. © 2012 American Institute of Physics.
format	JOUR
author	Martin, L.N. Dmitruk, P. Gomez, D.O.
author_facet	Martin, L.N. Dmitruk, P. Gomez, D.O.
author_sort	Martin, L.N.
title	Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic
title_short	Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic
title_full	Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic
title_fullStr	Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic
title_full_unstemmed	Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic
title_sort	energy spectrum, dissipation, and spatial structures in reduced hall magnetohydrodynamic
url	http://hdl.handle.net/20.500.12110/paper_1070664X_v19_n5_p_Martin
work_keys_str_mv	AT martinln energyspectrumdissipationandspatialstructuresinreducedhallmagnetohydrodynamic AT dmitrukp energyspectrumdissipationandspatialstructuresinreducedhallmagnetohydrodynamic AT gomezdo energyspectrumdissipationandspatialstructuresinreducedhallmagnetohydrodynamic
_version_	1807321112883757056

Energy spectrum, dissipation, and spatial structures in reduced Hall magnetohydrodynamic

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