Alfvénic wake of the pulsar’s companion body seen from above the equatorial plane. The velocity of the source regions V_s is assumed to be along the Alfvén wings. The thick grey lines represent the cones in which emitted radio waves are focussed. We call them the angular emission patterns. The observer’s frame related to the upper wing on the figure (making an angle δ₊ with the wind) is indicated by the Ox and Oz axes. It is fixed relative to the pulsar companion. The two stars mark the region of the angular emission patterns of highest wave intensity (see Sect. 4).