Fig. 4.

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Kink wave transverse velocity (vx) at the loop centre (x = y = 0) as a function of altitude and time. The velocity is shown for four 3D simulations with different driver periods P0, after an initial settling time of 2P0 (for P0 = 200 s, 335 s, and 700 s), or 0.42P0 (for P0 = 2000 s). The dashed black lines represent a propagation at the kink speed (see Eq. (13)), and are independent of the driver period.
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