As panels II (through the apex) and III (between arcades) in Fig. 6 for the τ_DC (top row) and τ_AC (bottom row) simulations with a truncated time axis between approximately 450 s and 1200 s. The solid lines are the expected signatures of an Alfvén wave excited on the lower boundary at approximately t = 800 s. These are calculated along a single magnetic field line (black: right hand panels) and taking multiple magnetic field lines into account (green: left hand panels).