(a) Time–distance plot for normalized density, ρ. The density upstream of the gas-dynamic shock increases and propagating shocks are seen here, as with Figure 4. (b) The amplitude increase for the propagating secondary waves/shocks can be seen as a consequence of the Alfvén instability at z = 0.3. Panel (c) shows the downstream density at z = 0.99.

(Animations (a and b) of this figure are available.)

The video/animation of this figure is available in the online journal.