Snapshots of the perturbations of the mass density ϱ (top left panel), the parallel component of the velocity (top right panel), the absolute value of the magnetic field  | B |  (bottom left panel) and the current density j (bottom right panel) in a propagating slow magnetoacoustic pulse. The pulse is shown at the time t = 67.5 s, after the reflection from the arcade footpoint. The results were obtained for T_a = 0.1T₀.