English title

The space environment consists mainly of high-energy charged particles, such as protons, electrons and heavy ions. They are originating from several sources including galactic cosmic radiation, solar flares and van Allen belts. High energy electromagnetic radiation and neutrons have also been measured on spacecraft. Although shielding can reduce the effect of space radiation it cannot be eliminated completely. So the proper evaluation is the key to improve the system performance in space environment. In this paper, the space environment analysis and evaluation for High Altitude Satellites reported with an emphasis on radiation analysis as being the most significant source of space product failures. When there is no shielding, the forecasted value of Total Ionizing Dose (TID) is 10⁹ rads (Si) and non-ionizing Displacement Damage Dose (DDD) is 10¹⁴ MeV/g(Si) for 18-year mission lifetime of high altitude  satellite.