3D Simulations of Fluctuation Spectra in the Hall-MHD Plasma

Details 3D Simulations of Fluctuation Spectra in the Hall-MHD Plasma 3D Simulations of Fluctuation Spectra in the Hall-MHD Plasma

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009phrvl.102d5004s&link_type=abstract

Physical Review Letters, vol. 102, Issue 4, id. 045004

Astronomy and Astrophysics

Astrophysics

16

Magnetohydrodynamics, Two-Fluid And Multi-Fluid Plasmas, Plasma Turbulence, Laboratory Studies Of Space- And Astrophysical-Plasma Processes

Scientific paper

Turbulent spectral cascades are investigated by means of fully three-dimensional (3D) simulations of a compressible Hall-magnetohydrodynamic (H-MHD) plasma in order to understand the observed spectral break in the solar wind turbulence spectra in the regime where the characteristic length scales associated with electromagnetic fluctuations are smaller than the ion gyroradius. In this regime, the results of our 3D simulations exhibit that turbulent spectral cascades in the presence of a mean magnetic field follow an omnidirectional anisotropic inertial-range spectrum close to k-7/3. The latter is associated with the Hall current arising from nonequal electron and ion fluid velocities in our 3D H-MHD plasma model.

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