Observation of solar particle events from CREDO and MPTB during the current solar maximum

Data obtained from the Microelectronics and Photonics Test Bed (MPTB) since July 2000 show a large number of solar particle events. Measurements from the Cosmic Radiation Environment Dosimetry (CREDO) Experiment show that the relative importance of proton and heavy ion fluxes varies greatly from event to event and even with time during an event. Single-event upsets in the analog-to-digital converter experiment are compared with calculations based on the measured fluxes; this demonstrates the importance of both contributions. Three major events show that the CREME96 worst-day model can be equaled in ions and exceeded in protons.