The Electron Proton Helium INstrument as an example for a Space Weather Radiation InstrumentPatrick Kühl, Bernd Heber, Raúl Gómez-Herrero, Olga Malandraki, Arik Posner and Holger SierksJ. Space Weather Space Clim., 10 (2020) 53DOI: https://doi.org/10.1051/swsc/2020056