In situ data observed by ACE. From top to bottom: proton density, proton bulk speed, proton temperature, pitch angle distribution of ∼272 eV electrons, magnitude, components and ϕ angle of the magnetic field, and the O⁷⁺/O⁶⁺ and C⁶⁺/C⁵⁺ charge state ratios of oxygen and carbon. The proton density is combined with 1 min resolution data (black line) and 12 min resolution data (red). The pink shaded bar in the low density region and the solid line represents the interface, as in Fig. 2.