GSEP event with time profiles of various physical quantities. (a) Solar Orbiter SIS 1 hr H, ³He, ⁴He, O, and Fe intensity at 0.23–0.32 MeV nucleon⁻¹. The H PSP curve is a combination of 1 hr H count rates (s⁻¹) from 14 energy bins between 0.023 MeV and 0.187 MeV from PSP IS⊙IS EPI-Lo. (b) Solar Orbiter SIS 3 h ⁴He/H and Fe/O ratios at 0.23–0.32 MeV nucleon⁻¹. The horizontal lines mark ⁴He/H and Fe/O in GSEP events (Reames 1995). (c) Solar Orbiter SIS mass vs. time at 0.4–10 MeV nucleon⁻¹. (d) Solar Orbiter SIS 1/(ion speed) vs. arrival times of 10–70 AMU ions. The measurements are from both SIS telescopes and averaged together. The vertical dashed line indicates the first appearance of the CME in the STEREO-A/COR2 coronagraph. Sloped lines mark arrival times for particles traveling along the nominal Parker field line without scattering. The horizontal color bar on the top shows IMF polarity at Solar Orbiter. Red is negative, green is positive, and yellow is an ambiguous polarity.