Figure 1

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