Plasma properties around the short excursion of the magnetic field from the sunward (B_R < 0) to the antisunward. From top to bottom: magnetic field, protons bulk velocity, protons density with the magnetic field magnitude, and proton velocity distribution functions (VDF) in the plane containing vectors V and B. The horizontal axis V_X in the VDF panels is an axis in the {V, B} plane maximally parallel to the spacecraft X axis. The vertical axis V_P is perpendicular to V_X in the plane. The horizontal bars in the panel of proton’s number density show the time intervals of antiparallel strahl electrons in green and the intervals of the positive V_αp (V_He + + > V_H+) in red. The gray part of the strahl bar shows the bi-directional PAD. The blue bar shows the negative V_αp (V_He++ ≤ V_H+).