Spatial distribution of spacecraft and their magnetic connectivity at 09:45 UT on 13 May 2024, along with SEP observations from multiple spacecraft. (a) The spacecraft constellation was produced using the Solar-MACH tool (Gieseler et al. 2023), which is accessible online https://doi.org/10.5281/zenodo.7016783. The solar wind speeds applied at various positions are derived from a combination of in situ measurements and estimated values, as detailed in the main text. (b) Proton intensities near 22 MeV recorded by the different spacecraft are shown. The orange vertical line marks the time of the flare’s soft X-ray peak (around 09:44 UT), which is associated with the observed SEP event.