|Multifluid Magnetohydrodynamic Turbulence in Weakly Ionised
|459, 6th International Conference of Numerical Modeling of Space Plasma Flows (ASTRONUM 2011)
|Downes, T. P.
|Initial results from simulations of 4-fluid MHD turbulence in molecular
clouds are presented. The species included in the simulations are ions,
electrons, negatively charged dust grains and neutrals. The results indicate
that, on length scales of a few tenths of a parsec, multifluid effects have a
significant impact on the properties of the turbulence. In particular,
the power spectra of the velocity and magnetic fields are significantly
softened, while the PDF of the densities of the charged and neutral
fluids are appreciably different. Indeed, the magnetic field strength
displays much less spatial structure on all lengthscales up to 1 pc
than in the ideal MHD case. The assumptions of ideal MHD
therefore appear to be inadequate for simulating turbulence in molecular
clouds at these length scales.