The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with Respect to the Flow

The hydromagnetic Kelvin-Helmholtz instability is relevant in many complex situations in astrophysical and laboratory plasmas. Many cases of interest are very complicated, since they involve the combined roles of velocity shear, density and magnetic field stratification, and various geometries in co...

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Detalles Bibliográficos
Autores principales:	González, Alejandro Guillermo, Gratton, Julio
Publicado:	1994
Materias:	Dispersion (waves) Hall effect Interfacial energy Magnetic field effects Magnetohydrodynamics Parameter estimation Plasma collision processes Plasma density Plasma flow Stress analysis Velocity Kelvin-Helmholtz instability Plasma stability
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223778_v51_n1_p43_Gonzalez http://hdl.handle.net/20.500.12110/paper_00223778_v51_n1_p43_Gonzalez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00223778_v51_n1_p43_Gonzalez
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spelling	paper:paper_00223778_v51_n1_p43_Gonzalez2023-06-08T14:50:30Z The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with Respect to the Flow González, Alejandro Guillermo Gratton, Julio Dispersion (waves) Hall effect Interfacial energy Magnetic field effects Magnetohydrodynamics Parameter estimation Plasma collision processes Plasma density Plasma flow Stress analysis Velocity Kelvin-Helmholtz instability Plasma stability The hydromagnetic Kelvin-Helmholtz instability is relevant in many complex situations in astrophysical and laboratory plasmas. Many cases of interest are very complicated, since they involve the combined roles of velocity shear, density and magnetic field stratification, and various geometries in compressible plasmas. The present work is part of a systematic investigation of the influence of the various physical and geometrical parameters characterizing the plasmas on the Kelvin-Helmholtz modes. The general dispersion relation for ideal compressible MHD modes localized near a velocity discontinuity between two uniform plasmas is derived. The existence and characteristics of the modes and their stability are studied analytically for any relative orientation of B, u and k, for continuous B and p. It is shown that the stability of a given configuration cannot be determined by considering only special orientations of k (say flute or parallel modes). The results obtained here may serve as a guide to interpret results in more complicated and realistic situations, such as those occurring in expeririments and natural plasmas. © 1994, Cambridge University Press. All rights reserved. Fil:González, A.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gratton, J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1994 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223778_v51_n1_p43_Gonzalez http://hdl.handle.net/20.500.12110/paper_00223778_v51_n1_p43_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	Dispersion (waves) Hall effect Interfacial energy Magnetic field effects Magnetohydrodynamics Parameter estimation Plasma collision processes Plasma density Plasma flow Stress analysis Velocity Kelvin-Helmholtz instability Plasma stability
spellingShingle	Dispersion (waves) Hall effect Interfacial energy Magnetic field effects Magnetohydrodynamics Parameter estimation Plasma collision processes Plasma density Plasma flow Stress analysis Velocity Kelvin-Helmholtz instability Plasma stability González, Alejandro Guillermo Gratton, Julio The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with Respect to the Flow
topic_facet	Dispersion (waves) Hall effect Interfacial energy Magnetic field effects Magnetohydrodynamics Parameter estimation Plasma collision processes Plasma density Plasma flow Stress analysis Velocity Kelvin-Helmholtz instability Plasma stability
description	The hydromagnetic Kelvin-Helmholtz instability is relevant in many complex situations in astrophysical and laboratory plasmas. Many cases of interest are very complicated, since they involve the combined roles of velocity shear, density and magnetic field stratification, and various geometries in compressible plasmas. The present work is part of a systematic investigation of the influence of the various physical and geometrical parameters characterizing the plasmas on the Kelvin-Helmholtz modes. The general dispersion relation for ideal compressible MHD modes localized near a velocity discontinuity between two uniform plasmas is derived. The existence and characteristics of the modes and their stability are studied analytically for any relative orientation of B, u and k, for continuous B and p. It is shown that the stability of a given configuration cannot be determined by considering only special orientations of k (say flute or parallel modes). The results obtained here may serve as a guide to interpret results in more complicated and realistic situations, such as those occurring in expeririments and natural plasmas. © 1994, Cambridge University Press. All rights reserved.
author	González, Alejandro Guillermo Gratton, Julio
author_facet	González, Alejandro Guillermo Gratton, Julio
author_sort	González, Alejandro Guillermo
title	The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with Respect to the Flow
title_short	The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with Respect to the Flow
title_full	The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with Respect to the Flow
title_fullStr	The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with Respect to the Flow
title_full_unstemmed	The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with Respect to the Flow
title_sort	kelvin-helmholtz instability in a compressible plasma: the role of the orientation of the magnetic field with respect to the flow
publishDate	1994
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00223778_v51_n1_p43_Gonzalez http://hdl.handle.net/20.500.12110/paper_00223778_v51_n1_p43_Gonzalez
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The Kelvin-Helmholtz Instability in a Compressible Plasma: The Role of the Orientation of the Magnetic Field with Respect to the Flow

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