INTERNATIONAL STANDARD ISO TS 15391 Technical specification Version 2004 October ______________________________________________________________ Space Environment (Natural and Artificial) Probabilistic model for fluences and peak fluxes of solar energetic particles Part I Protons Memorandum Reference No. ISO 15391 SPACE ENVIRONMENT (NATURAL AND ARTIFICIAL) Probabilistic model for fluences and peak fluxes of solar energetic particles: Part I - protons 1 Memorandum-2004 (October) (Memorandum is compiled by