Structure of the electromagnetic field in Hall MHD turbulence and relation to reconnection

Details Structure of the electromagnetic field in Hall MHD turbulence and relation to reconnection Structure of the electromagnetic field in Hall MHD turbulence and relation to reconnection

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41a1454d&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM41A-1454

Physics

7827 Kinetic And Mhd Theory, 7835 Magnetic Reconnection (2723, 7526), 7839 Nonlinear Phenomena (4400, 6944), 7863 Turbulence (4490)

Scientific paper

Numerical simulations of three-dimensional compressible Hall MHD turbulence are performed. The ratio of the ion skin depth to the macroscopic scale of the turbulence controls the influence of the Hall term in Ohm's law. The ion skin depth is set to be slightly larger than the dissipation lengthscale (controlled by the resistivity) for Hall MHD simulations, while it is set to zero for non-Hall MHD simulations. The system is let to evolve for a few turbulent characteristic times and the magnetic and electric fields are analyzed in real and wavenumber space. Distributions (histograms) of the fields are also computed. It is found that the turbulent magnetic field (as well as the velocity field) is almost unaffected by the presence of the Hall term, while the electric field is affected at scales smaller than the ion skin depth. The importance of each term in Ohm's law for the electric field is analyzed in wavenumber space. Reconnection-like zones (within a turbulent state) are identified, where the importance of each term in Ohm's law can be seen in real space.

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