Figure 8: Images of the gas entropy (red is higher than the equilibrium value, blue is lower) illustrate
the instability of a spherical standing accretion shock. This model has and is perturbed by
placing overdense rings into the infalling preshock gas. The shock is kept stalled by using a cooling
function. Note that with the scaling for a realistic supernova model, the last image on the right
corresponds to 300 ms. These simulations are axisymmetric, forcing a reflection symmetry about the
vertical axis. (Figure 6 of [21]; used with permission.)
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