a) Angular distribution function of accelerated downstream electrons for a perpendicular wavy shock in an arbitrarily chosen downstream point (thin solid line). The direction of the magnetic field B₂ is shown. The shock is located opposite to this direction. The distribution function is rotationally symmetric around B₂. It is a polar graph, where the polar angle corresponds to the pitch angle α and the radial distance (in a logarithmic scale) to a value of the distribution function f(v,α) of accelerated downstream electrons. The velocity v is constant here and its value corresponds to the energy of 3 keV. The dashed circle labelled 1 ×  represents the value of the initial distribution function f_i(v) from (19). For comparison, the thick solid line shows the angular distribution function of transmitted electrons through a perpendicular plane shock wave. b) The same as in a), but the thin solid line shows the angular distribution averaged along the shock front.