The time-dependent flow structure of a galactic wind up to 1   Mpc at seven different times at 3.7 × 10⁷, 1.1 × 10⁸, 2.3 × 10⁸, 3.7 × 10⁸, 5.3 × 10⁸, 7.7 × 10⁸, and 1.0 × 10⁹   years. At t = 0 the gas and cosmic ray pressure has been increased by a factor of 10 at the inner boundary of the flux tube, simulating a series of violent SN-explosions within a short time interval. In Panel a) the development of the density structure is plotted, where both the forward and the reverse shocks become visible. The velocity in  [km   s^-1]  is depicted in panel b) where the particle acceleration broadens the shock fronts in time. In panels c) and d) the curves correspond to the gas and the cosmic ray pressure, together with the wave pressure (dashed lines), respectively. The velocities of the propagating features are also plotted in Figs. 4 and 6 (see text for more details).