Impact of the Trapped Proton Anisotropy on the Ionizing Dose at Low Earth Orbits

The trapped proton anisotropy is not commonly taken into account in the radiation hardness assurance process for Low Earth Orbit missions. In this study, the impact of considering this characteristic of the trapped proton population is evaluated for the TID, Total Ionizing Dose, risk assessment at electronic component level. A specific development has been made in the OMERE tool and the realistic 3-dimensional radiation model of the SAC-D satellite (660 km, 98°) has been used to take into account the shielding around the components. It is shown that considering the proton anisotropy has no important impact on the TID result.