Compressible turbulence in Hall Magnetohydrodynamics

By direct numerical simulations we investigate the nonlinear dynamics of a compressible Hall Magnetohydrodynamic (MHD) plasma. At small scales, where the Hall effect dominates, we found an increase of the compressibility of the system and the breakdown of the strong link between velocity and magneti...

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Published inPlanetary and space science Vol. 55; no. 15; pp. 2239 - 2243
Main Authors Servidio, S., Carbone, V., Primavera, L., Veltri, P., Stasiewicz, K.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2007
Subjects
Fysik
Interplanetary physics
Magnetohydrodynamics and plasmas
NATURAL SCIENCES
NATURVETENSKAP
Physics
Space plasma physics
Turbulence
Turbulence
95.30.Qd
Magnetohydrodynamics and plasmas
94.05.Lk
Space plasma physics
96.50. - e
Interplanetary physics
94.05. - a
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Summary:By direct numerical simulations we investigate the nonlinear dynamics of a compressible Hall Magnetohydrodynamic (MHD) plasma. At small scales, where the Hall effect dominates, we found an increase of the compressibility of the system and the breakdown of the strong link between velocity and magnetic fields, typical of usual MHD. Moreover, we find that small-scale fluctuations are characterized by an anti-correlation between density and magnetic field intensity. These features characterize the excitation of a quasi-perpendicular magnetosonic turbulence that can be interpreted as the small-scale signature of the break-down of the MHD nonlinear energy cascade due to Hall effect. Fluctuations with the same properties, based on measurements by Cluster spacecraft in space plasma turbulence during different magnetopause crossings, have been recently observed.
Bibliography:ObjectType-Article-1
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content type line 23
ISSN:0032-0633
1873-5088
1873-5088
DOI:10.1016/j.pss.2007.05.023