Compressible turbulence in Hall Magnetohydrodynamics
2007 (English)In: Planetary and Space Science, ISSN 0032-0633, E-ISSN 1873-5088, Vol. 55, no 15, 2239-2243 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2007. Vol. 55, no 15, 2239-2243 p.
space plasma physics, turbulence, interplanetary physics, Magnetohydrodynamics and plasmas
IdentifiersURN: urn:nbn:se:uu:diva-150962DOI: 10.1016/j.pss.2007.05.023ISI: 000251814900005OAI: oai:DiVA.org:uu-150962DiVA: diva2:409497