Figure 2

[Sub-case I(b)] (a) An “inverse” polarity shock wave (kink-soliton like profile) \(\Phi\) and (b) the associated electric field (E) are depicted in the \(\xi - \tau\) plane, for arbitrary fixed values \(A=-1\) and \(B=C=1\). Propagation towards the right (i.e. in the positive direction of the axis) is assumed.