Diffusive alignment of the magnetic field in active regions of plasmas
Regions of high magnetic field within plasmas tend to keep this field aligned in a dominant direction. This occurs both in observed phenomena and in simulations of kinematic and nonlinear dynamos. Although most of this effect is due to the particular dynamics of each case, magnetic diffusion also plays an important role. It is shown here that the unitary magnetic field vector satisfies a certain estimate that bounds its possible variations. The dependence of the bound on the plasma parameters is analyzed.
Nunez
M
Departamento de Analisis Matematico, Universidad de Valladolid, 47005 Valladolid, Spain.