Modelling large solar proton events with the shock-and-particle model - Extraction of the characteristics of the MHD shock front at the cobpointJens Pomoell, Angels Aran, Carla Jacobs, Rosa Rodríguez-Gasén, Stefaan Poedts and Blai SanahujaJ. Space Weather Space Clim., 5 (2015) A12DOI: https://doi.org/10.1051/swsc/2015015