1 min averaged solar wind magnetic field and plasma parameters as detected by the Wind spacecraft at L1. From top to bottom: bulk speed (v), proton number density (n_p), magnetic field magnitude (B), magnetic field components in GSE coordinates (B_x, B_y, B_z), proton temperature (T_p), magnetic field elevation (θ_B), and proton β (β_p). Bottom panel: 1 h Dst index. The duration of the sheath is indicated by the yellow area, while the duration of the magnetic ejecta is bounded by the blue area. The dashed blue line marks the start of the perturbation in the speed profile due to an approaching fast solar wind stream at the back of the CME. The temperature panel shows the comparison of the observed proton temperature, T_p, (in black) with the expected temperature, T_exp, calculated using the speed-temperature relation by Lopez & Freeman (1986; in red). In the β_p panel, the value β_p = 1 is indicated by the dashed grey line.