Observations of the HCS crossing on September 27, 2023. (a) Pitch-angle distribution of 433 eV suprathermal electrons. (b) Magnetic field magnitude |B|, with red arrows marking four enhancement events. (c) Radial magnetic field component B_R, with the horizontal double-sided red arrow indicating the interval of main interest. (d) Tangential (B_T, blue) and normal (B_N, red) magnetic field components. (e) Radial component of the solar wind velocity V_R. (f) Proton number density N_p. (g) Expanded view of the magnetic field data during the ∼2.2-minute interval marked in panel c, showing the four enhancement events in detail.