Light Flashes Observations On Board Mir And ISS WithSileye Experiments

In this work we present measurements of cosmic ray nuclear abundances above 100 MeV/n inside Mir and the International Space Station (ISS). Observations inside Mir Space Station were performed with SilEye-2 experiment, a 6 plane silicon strip detector telescope designed to measure environmental radiation and investigate on the Light Flash (LF) phenomenon. A total of 100 sessions comprising more than 1000 hours of observation was performed in the years 1998- 2000. ISS data have been taken in 2002 with Sileye-3/Alteino (an 8 plane, 32 strip silicon detector) device during the Soyuz-34 flight. We report on SilEye-3/Alteino relative abundances from Boron to Silicon measured in Pirs module of ISS and on the comparison with Sileye-2 results.