The probabilistic solar particle event forecasting (PROSPER) model Athanasios Papaioannou, Rami Vainio, Osku Raukunen, Piers Jiggens, Angels Aran, Mark Dierckxsens, Sotirios A. Mallios, Miikka Paassilta and Anastasios Anastasiadis J. Space Weather Space Clim., 12 (2022) 24 Published online: 28 June 2022 DOI: 10.1051/swsc/2022019