The magnetic field and energetic ions at ACE (located at L1). Top panel: magnetic field magnitude (black) and three magnetic field components in RTN (blue: B_R, green: B_T, pink: B_N). The following panels give the energetic ions observations for four energy ranges (P1p−P4p with energies shown in each panel). The units are cm⁻² sr⁻¹ s⁻¹ MeV⁻¹. The shock is shown by the vertical black line and the magnetic cloud leading edge by the red solid line.