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Published online by Cambridge University Press: 14 May 2003
Taylor and Cargill (2001) presented a general theory of expansion waves in MHD flows. On page 243 we defined the magnetic field in the $r$-$\theta$ plane as ${\bf B}=(B_{r}(\theta), B_{\theta}(\theta), B_{z}(\theta))$, and ${\bf V}=(V_{r}(\theta), V_{\theta}(\theta), 0)$. It has been pointed out to us that this assumption is in general inconsistent with the z-component of the momentum equation.