Longitudinal spacecraft constellation and magnetic connectivity at 05:58 UT on 2022 January 20 (left) along with multi-spacecraft SEP measurements (right). Left: Spacecraft configuration using the Solar-MACH tool (Gieseler et al. 2023), available online at https://doi.org/10.5281/zenodo.7100482. Right: The upper panel shows near-relativistic electron intensities and the lower panel ∼5 MeV proton intensities observed by the spacecraft indicated with the same colour code shown on the left panel. The blue vertical line indicates the time of the soft-X ray peak of the flare (∼05:58 UT) associated with the SEP event.