Solar wind turbulence: Comparison of MHD and hybrid simulations.

We present 21/2D simulations of the evolution of a vortex in the solar wind in the form of a comparison of three models: (1) MHD with dissipation, (2) MHD with the dispersive Hall term but no dissipation, and (3) hybrid simulations which treat ions as particles and electrons as a fluid. At large scales all three models predict that the vortex distorts due to a pressure imbalance and forms shock-like structures within which the current and vorticity grow. In the MHD-Hall and hybrid simulations, short wavelength dispersive waves are generated in these structures. [ABSTRACT FROM AUTHOR]