Schematic illustration of the propagation of the reverse shock (velocity vr ~ 1600 km s-1) into the smooth ejecta and through an ejecta clump. The reverse shock hitting the clump generates a cloud shock that propagates with velocity , where we assume χ = ncloud/nsmooth = 100 and ncloud = 100 cm-3, which leads to nsmooth ≡ n = 1 cm-3. Figure adapted from Micelotta (2013).
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