Simultaneous observation of the radiation environment inside and outside the ISS Original Research Article

The low-Earth orbit (LEO) radiation environment has been directly observed by the Intra-Vehicular (IV) and Extra-Vehicular (EV) Charged Particle Directional Spectrometers (CPDS) aboard the International Space Station (ISS). The EV instrument is mounted on the S0 truss of the ISS and consists of three separate silicon detector telescopes which are oriented in different directions. The IV instrument is a single silicon detector telescope located inside the US Laboratory module of the ISS. We report on the current state of the data analysis for these instruments, which includes the proton stopping particle spectrum, relative carbon, nitrogen, and oxygen ion (CNO) abundances, and linear energy transfer (LET) spectra.