In situ magnetic field and plasma observations as well as SEP time profiles by (a) near-Earth spacecraft and (b) STEREO-A, together with (c) proton observations by JUICE. The panels in (a) and (b) from top to bottom: (i) magnetic field magnitude, (ii) magnetic field components (where RTN stands for radial-tangential-normal coordinates; e.g. Hapgood 1992), magnetic field (iii) latitudinal and (iv) azimuthal angles, θ_B-RTN and ϕ_B-RTN, (v) solar wind speed, (vi) proton density, (vii) proton temperature, (viii) plasma β, (ix) solar wind suprathermal electron PADs, and (x) energetic proton temporal profiles. The purple dashed line indicates the flare peak time (13 May 2024 at 09:44 UT). Solid gray vertical lines indicate the passage of IP shocks or shock-like structures, whilst shaded areas in alternating colours indicate magnetic ejecta. The panel in (c) shows the energetic proton temporal profiles (i) for JUICE, with the three marked magnetic ejecta regions being propagated from their corresponding passage times at STEREO-A. Further details are given in the main text.