Total Poynting flux through a plane perpendicular to B₀ as a function of the interaction strength for different Alfvén Mach numbers M_A = 0.04, M_A = 0.4 and M_A = 0.66. The solid lines shows the solution of the full nonlinear expression (53) and the dashed lines the approximations given by (55). The background magnetic field B₀ and the incident plasma flow v₀ are assumed to be perpendicular, i.e. Θ = 0.