Stability of mixed Ekman-Hartmann boundary layers

In this paper we study the nonlinear stability of Ekman-Hartmann-type bound ary layers in a rotating magnetohydrodynamics flow in a half-space and betw een two planes. We prove rigorously that if the Reynolds number defined on boundary-layer characteristics is smaller than a critical value, the bounda ry layer is nonlinearly stable. It is shown that the normal component of th e magnetic field increases the critical Reynolds number for instability. AM S classification scheme numbers: 35Q35, 76U05, 76W05.