Double-diffusive Magnetic Layering

Abstract Double-diffusive systems, such as thermosolutal convection, in which the density depends on two components that diffuse at different rates, are prone to both steady and oscillatory instabilities. Such systems can evolve into layered states, components, also density, adopt a “staircase” profile. Turbulent transport is enhanced significantly state. Here we exploit an analogy between magnetic buoyancy convection order demonstrate phenomenon of layering. We examine long-term nonlinear evolution vertically stratified horizontal field so-called “diffusive regime,” where linear instability operates. Motivated astrophysically, consider case viscous diffusivities much smaller than thermal diffusivity. diffusive layering occur even for subadiabatic temperature gradients. Magnetic may be relevant stellar radiative zones, with implications turbulent heat, field, chemical elements.