Vertical cuts at x = 0 for the vertical velocity for the simulation P-b at two different times (note the changing axis scales). This can be compared with the weaker field strength case from Fig. 10, left panel. The equipartition height is shown by a vertical light blue dotted line located at z = 0.85 Mm in both panels. Right panel: the vertical dotted dark blue line located at z = 1.42 Mm indicates the reflection height of the fast component. The wave modes: upward fast (FU), slow (S), and downward fast (FD) present in each of the regions are indicated in the panels.