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SHEAR-DRIVEN INSTABILITIES IN HALL-MAGNETOHYDRODYNAMIC PLASMAS
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita).ORCID-id: 0000-0002-7304-021X
2011 (Engelska)Ingår i: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 737, nr 2, s. 62-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

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.

Ort, förlag, år, upplaga, sidor
2011. Vol. 737, nr 2, s. 62-
Nyckelord [en]
instabilities, magnetohydrodynamics (MHD), plasmas
Nationell ämneskategori
Naturvetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-68292DOI: 10.1088/0004-637X/737/2/62ISI: 000294013600016OAI: oai:DiVA.org:su-68292DiVA, id: diva2:477975
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authorCount :3Tillgänglig från: 2012-01-15 Skapad: 2012-01-03 Senast uppdaterad: 2022-03-09Bibliografiskt granskad

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Brandenburg, Axel

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Institutionen för astronomiNordiska institutet för teoretisk fysik (Nordita)
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