Kelvin-Helmholtz versus Hall magnetoshear instability in astrophysical flows

We study the stability of shear flows in a fully ionized plasma. Kelvin-Helmholtz is a well-known macroscopic and ideal shear-driven instability. In sufficiently low-density plasmas, also the microscopic Hall magnetoshear instability can take place. We performed three-dimensional simulations of the...

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Autores principales: Gómez, D.O., Bejarano, C., Mininni, P.D.
Formato: JOUR
Materias:
Magnetohydrodynamics
Magnetoplasma
Plasma stability
Shear flow
Astrophysical flows
Comparative studies
Ion-cyclotron frequency
Ionized plasmas
Kelvin-Helmholtz
Kelvin-helmholtz instabilities
Low-density plasmas
Three dimensional simulations
Plasma diagnostics
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_15393755_v89_n5_p_Gomez
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_15393755_v89_n5_p_Gomez
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spelling todo:paper_15393755_v89_n5_p_Gomez2023-10-03T16:22:48Z Kelvin-Helmholtz versus Hall magnetoshear instability in astrophysical flows Gómez, D.O. Bejarano, C. Mininni, P.D. Magnetohydrodynamics Magnetoplasma Plasma stability Shear flow Astrophysical flows Comparative studies Ion-cyclotron frequency Ionized plasmas Kelvin-Helmholtz Kelvin-helmholtz instabilities Low-density plasmas Three dimensional simulations Plasma diagnostics We study the stability of shear flows in a fully ionized plasma. Kelvin-Helmholtz is a well-known macroscopic and ideal shear-driven instability. In sufficiently low-density plasmas, also the microscopic Hall magnetoshear instability can take place. We performed three-dimensional simulations of the Hall-magnetohydrodynamic equations where these two instabilities are present, and carried out a comparative study. We find that when the shear flow is so intense that its vorticity surpasses the ion-cyclotron frequency of the plasma, the Hall magnetoshear instability is not only non-negligible, but it actually displays growth rates larger than those of the Kelvin-Helmholtz instability. © 2014 American Physical Society. Fil:Gómez, D.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bejarano, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Mininni, P.D. 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_15393755_v89_n5_p_Gomez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Magnetohydrodynamics
Magnetoplasma
Plasma stability
Shear flow
Astrophysical flows
Comparative studies
Ion-cyclotron frequency
Ionized plasmas
Kelvin-Helmholtz
Kelvin-helmholtz instabilities
Low-density plasmas
Three dimensional simulations
Plasma diagnostics
spellingShingle Magnetohydrodynamics
Magnetoplasma
Plasma stability
Shear flow
Astrophysical flows
Comparative studies
Ion-cyclotron frequency
Ionized plasmas
Kelvin-Helmholtz
Kelvin-helmholtz instabilities
Low-density plasmas
Three dimensional simulations
Plasma diagnostics
Gómez, D.O.
Bejarano, C.
Mininni, P.D.
Kelvin-Helmholtz versus Hall magnetoshear instability in astrophysical flows
topic_facet Magnetohydrodynamics
Magnetoplasma
Plasma stability
Shear flow
Astrophysical flows
Comparative studies
Ion-cyclotron frequency
Ionized plasmas
Kelvin-Helmholtz
Kelvin-helmholtz instabilities
Low-density plasmas
Three dimensional simulations
Plasma diagnostics
description We study the stability of shear flows in a fully ionized plasma. Kelvin-Helmholtz is a well-known macroscopic and ideal shear-driven instability. In sufficiently low-density plasmas, also the microscopic Hall magnetoshear instability can take place. We performed three-dimensional simulations of the Hall-magnetohydrodynamic equations where these two instabilities are present, and carried out a comparative study. We find that when the shear flow is so intense that its vorticity surpasses the ion-cyclotron frequency of the plasma, the Hall magnetoshear instability is not only non-negligible, but it actually displays growth rates larger than those of the Kelvin-Helmholtz instability. © 2014 American Physical Society.
format JOUR
author Gómez, D.O.
Bejarano, C.
Mininni, P.D.
author_facet Gómez, D.O.
Bejarano, C.
Mininni, P.D.
author_sort Gómez, D.O.
title Kelvin-Helmholtz versus Hall magnetoshear instability in astrophysical flows
title_short Kelvin-Helmholtz versus Hall magnetoshear instability in astrophysical flows
title_full Kelvin-Helmholtz versus Hall magnetoshear instability in astrophysical flows
title_fullStr Kelvin-Helmholtz versus Hall magnetoshear instability in astrophysical flows
title_full_unstemmed Kelvin-Helmholtz versus Hall magnetoshear instability in astrophysical flows
title_sort kelvin-helmholtz versus hall magnetoshear instability in astrophysical flows
url http://hdl.handle.net/20.500.12110/paper_15393755_v89_n5_p_Gomez
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AT mininnipd kelvinhelmholtzversushallmagnetoshearinstabilityinastrophysicalflows
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