Time-height diagram of (left) and (right) for three selected horizontal positions in the vertical periodic driver simulations. Upper row: x = 150 km, where the magnetic field is nearly vertical. Middle row: x = 3750 km, close to the center of the left arcade with a nearly horizontal magnetic field. Bottom row: x = 7500 km close to the null-point location. The color scale is the same as in Fig. 3.