Notes. Regions 1 and 3 correspond to the drifting hydrogen plasmas, while region 2 is relative to the background hydrogen plasma at rest. is the mean free path relative to the collisions between drifting and ambient ions, while M_ms is the magnetosonic Mach number of the shock wave moving at speed v_s = 640km s⁻¹ in the ambient plasma characterized by a magnetosonic speed c_ms = 448km s⁻¹. We point out that the values relative to regions 1 and 3 refer only to the initial situation, before the shocks completely form, hence, they are not to be confused with the parameters of the downstream region at a certain time.