Schematic of the correlation process of the Well-Connected SEP forecasting module of the UMASEP scheme. (a) UMASEP-10, which correlates the time derivative of soft X-ray flux with the time derivative of the differential proton fluxes in different energy channels observed by the GOES spacecraft (9–500 MeV). (b) UMASEP-10mw, which uses the microwave flux density instead of the soft X-ray derivative.