Radial and θ velocity components and the plasma density as functions of θ at fixed radius at (a) ﹩\Delta \Phi =0.5﹩, 1.0, and 1.5 and (b) ﹩\Delta \Phi =1.5﹩, 2.0. These plots are for the ﹩n=1﹩ self‐similar field configuration with a uniform initial density distribution (﹩p=0﹩). Time is measured in units of ﹩1/ \Delta \Omega ﹩. The critical twist angle ﹩\Delta \Phi _{c}﹩ is attained at ﹩t_{c}=2.036﹩.