Time evolution of cosmic-ray modified MHD shocks

We present initial simulation results for the time e volution of CR modified plane parallel shocks in magneto-hydrodynamical flows. The simulations utilize our new and very efficient "Coarse Grained finite Momentum Volume" (CGMV) transport scheme [6]. The simulations aim to explore nonlinear feedback among the particles, the wave turbulence and the bulk flows. The calculations incorporate self-consistent treatment of the momentum-dependent CR diffusion convection equation and will soon be coupled with wave action equations for resonantly scattering Alfven and fast mode waves, also treated through the CGMV scheme. Recent advances in MHD turbulence theory require a broadened outlook on scattering processes in CR modified shocks.