Shear-driven instabilities in hall-magnetohydrodynamic plasmas

The large-scale dynamics of plasmas is well described within the framework of magnetohydrodynamics (MHD). However, whenever the ion density of the plasma becomes sufficiently low, the Hall effect is likely to become important. The role of the Hall effect has been studied in several astrophysical pla...

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Autores principales: Bejarano, Cecilia Soledad, Gomez, Daniel Osvaldo
Publicado: 2011
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v737_n2_p_Bejarano
http://hdl.handle.net/20.500.12110/paper_0004637X_v737_n2_p_Bejarano
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling paper:paper_0004637X_v737_n2_p_Bejarano2023-06-08T14:29:02Z Shear-driven instabilities in hall-magnetohydrodynamic plasmas Bejarano, Cecilia Soledad Gomez, Daniel Osvaldo The large-scale dynamics of plasmas is well described within the framework of magnetohydrodynamics (MHD). However, whenever the ion density of the plasma becomes sufficiently low, the Hall effect is likely to become important. The role of the Hall effect has been studied in several astrophysical plasma processes, such as magnetic reconnection, magnetic dynamo, MHD turbulence, or MHD instabilities. In particular, the development of small-scale instabilities is essential to understand the transport properties in a number of astrophysical plasmas. The magneto-rotational instability (MRI), which takes place in differentially rotating accretion disks embedded in relatively weak magnetic fields, is just one example. The influence of the large-scale velocity flows on small-scale instabilities is often approximated by a linear shear flow. In this paper, we quantitatively study the role of the Hall effect on plasmas embedded in large-scale shear flows. More precisely, we show that an instability develops when the Hall effect is present, which we therefore term as the Hall magneto-shear instability. As a particular case, we recover the so-called MRI and quantitatively assess the role of the Hall effect on its development and evolution. © 2011 The American Astronomical Society. All rights reserved. Fil:Bejarano, C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Gómez, D.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2011 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v737_n2_p_Bejarano http://hdl.handle.net/20.500.12110/paper_0004637X_v737_n2_p_Bejarano
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description The large-scale dynamics of plasmas is well described within the framework of magnetohydrodynamics (MHD). However, whenever the ion density of the plasma becomes sufficiently low, the Hall effect is likely to become important. The role of the Hall effect has been studied in several astrophysical plasma processes, such as magnetic reconnection, magnetic dynamo, MHD turbulence, or MHD instabilities. In particular, the development of small-scale instabilities is essential to understand the transport properties in a number of astrophysical plasmas. The magneto-rotational instability (MRI), which takes place in differentially rotating accretion disks embedded in relatively weak magnetic fields, is just one example. The influence of the large-scale velocity flows on small-scale instabilities is often approximated by a linear shear flow. In this paper, we quantitatively study the role of the Hall effect on plasmas embedded in large-scale shear flows. More precisely, we show that an instability develops when the Hall effect is present, which we therefore term as the Hall magneto-shear instability. As a particular case, we recover the so-called MRI and quantitatively assess the role of the Hall effect on its development and evolution. © 2011 The American Astronomical Society. All rights reserved.
author Bejarano, Cecilia Soledad
Gomez, Daniel Osvaldo
spellingShingle Bejarano, Cecilia Soledad
Gomez, Daniel Osvaldo
Shear-driven instabilities in hall-magnetohydrodynamic plasmas
author_facet Bejarano, Cecilia Soledad
Gomez, Daniel Osvaldo
author_sort Bejarano, Cecilia Soledad
title Shear-driven instabilities in hall-magnetohydrodynamic plasmas
title_short Shear-driven instabilities in hall-magnetohydrodynamic plasmas
title_full Shear-driven instabilities in hall-magnetohydrodynamic plasmas
title_fullStr Shear-driven instabilities in hall-magnetohydrodynamic plasmas
title_full_unstemmed Shear-driven instabilities in hall-magnetohydrodynamic plasmas
title_sort shear-driven instabilities in hall-magnetohydrodynamic plasmas
publishDate 2011
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v737_n2_p_Bejarano
http://hdl.handle.net/20.500.12110/paper_0004637X_v737_n2_p_Bejarano
work_keys_str_mv AT bejaranoceciliasoledad sheardriveninstabilitiesinhallmagnetohydrodynamicplasmas
AT gomezdanielosvaldo sheardriveninstabilitiesinhallmagnetohydrodynamicplasmas
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