Power spectra of the vertical velocity at z = 1.4 Mm from numerical simulations with waves excited by a broadband driver and various magnetic field strengths. The vertical magnetic field strength is 0 (black line, Simulation 3.4.1), 10 G (violet line, Simulation 3.4.2), 250 G (dark blue, Simulation 3.4.3), 500 G (light blue, Simulation 3.4.4), 1000 G (dark green, Simulation 3.4.5), 1500 G (light green, Simulation 3.4.6), 2000 G (orange, Simulation 3.4.7), and 2500 G (red line, Simulation 3.4.8). Solid lines indicate simulations with the base of the corona located at 2.0 Mm. Dashed lines indicate simulations without transition region or corona, with a vertical magnetic field strength of 0 (black line, bottom panel, 3.4.10) and 2500 G (red lines, both panels, Simulation 3.4.9). All the power spectra are normalized to the same value used for the normalization of the power spectra illustrated in Fig. 6.