Comparison of the thin flux tube approximation with 3D MHD simulations

3D MHD Simulations of Laboratory Plasma Jets

Jets and outflows are thought to be an integral part of accretion phenomena and are associated with a large variety of objects. In these systems, the interaction of magnetic fields with an accretion disk and/or a magnetized central object is thought to be responsible for the acceleration and collimation of plasma into jets and wider angle flows. In this paper we present three-dimensional MHD si...

Approximation of the trajectory attractor of the 3D MHD System

We study the connection between the long-time dynamics of the 3D magnetohydrodynamicα model and the exact 3D magnetohydrodynamic system. We prove that the trajectory attractor Uα of the 3D magnetohydrodynamic-α model converges to the trajectory attractor U0 of the 3D magnetohydrodynamic system (in an appropriate topology) when α approaches zero.

Nonlinear Mhd Simulations of Wave Dissipation in Flux Tubes

The phase-mixing and resonant dissipation of Alfv en waves is studied in both thèclosed' magnetic loops and thèopen' coronal holes observed in the hot solar corona. The resulting energy transfer from large to small length scales contributes to the heating of these magnetic structures. The nonlinear simulations show that the periodically varying shear ows that occur in the resonant layers are un...

3D MHD simulations of subsurface convection in OB stars

During their main sequence evolution, massive stars can develop convective regions very close to their surface. These regions are caused by an opacity peak associated with iron ionization. Cantiello et al. (2009) found a possible connection between the presence of subphotospheric convective motions and small scale stochastic velocities in the photosphere of early-type stars. This supports a phy...

3D MHD Simulations of Radio Galaxies Including Nonthermal Electron Transport