Outgoing FMS wave luminosity injected by long-envelope Alfvén waves (see Figure 2) measured at r/R _* = 5 and normalized to the injected Alfvén wave energy E _inj. We vary the injection amplitude for a fixed numerical resolution. The inset plot shows the peak luminosity as a function of the wave amplitude b _eq, following a trend ﹩\propto {b}_{\mathrm{eq}}^{2}﹩.