Estimation of SEU Threshold Energy from Kitsat-1 Data Using AP-8 Model

KITSAT-1, launched in 1992, passes through Inner Van Allen Radiation Belt in which high energy protons cause single event upsets(SEUs) in the main memory of KITSAT-1 OBC(On-Board Computer)186. The present paper compares SEU data from the OBC186 with the AP-8 model of NASA/NSSDC using the Chi-Square method to estimate the SEU threshold energy. Shielding effect by the satellite body has been taken into account to model the proton fluxes at the position of OBC186, and SEUs recorded during the high solar activities have been removed to avoid the spurious result. The result shows that the SEU threshold energy of the main memory of KITSAT-1 OBC186 is estimated to be about 110±10 MeV