标题： 从太空观测超高能宇宙粒子：SEUSO，超级极端宇宙空间天文台任务 显示英文标题

标题： Observing Ultra High Energy Cosmic Particles from Space: SEUSO, the Super Extreme Universe Space Observatory Mission

摘要： 在已知能量谱末端，从$E\sim 10^{19}$电子伏特到超过$E\sim 10^{20}$电子伏特的超高能宇宙信使的实验搜寻，为我们提供了一个探索宇宙未知方面的绝佳机会。 主要的科学目标包括确定超高能粒子的源、测量它们的能谱以及研究银河系和局部星系际磁场。 超高能粒子也可能携带未知物理或早期宇宙中奇异粒子遗迹的证据。 为应对这一挑战，需要显著提高综合观测时间。 这意味着需要一类新的具有更大视场且能很好地理解系统不确定性的实验。 基于空间的天文台可以达到系统探索超高能宇宙所需的瞬时视场和综合观测时间。 本文首先简要总结了该任务的科学背景，然后描述了SEUSO概念的科学目标和要求。 接着介绍了SEUSO的观测方法，并描述了主要仪器和任务特性。 最后讨论了该任务预期的性能。 显示英文摘要

摘要： The experimental search for ultra high energy cosmic messengers, from $E\sim 10^{19}$ eV to beyond $E\sim 10^{20}$ eV, at the very end of the known energy spectrum, constitutes an extraordinary opportunity to explore a largely unknown aspect of our universe. Key scientific goals are the identification of the sources of ultra high energy particles, the measurement of their spectra and the study of galactic and local intergalactic magnetic fields. Ultra high energy particles might, also, carry evidence of unknown physics or of exotic particles relics of the early universe. To meet this challenge a significant increase in the integrated exposure is required. This implies a new class of experiments with larger acceptances and good understanding of the systematic uncertainties. Space based observatories can reach the instantaneous aperture and the integrated exposure necessary to systematically explore the ultra high energy universe. In this paper, after briefly summarising the science case of the mission, we describe the scientific goals and requirements of the SEUSO concept. We then introduce the SEUSO observational approach and describe the main instrument and mission features. We conclude discussing the expected performance of the mission.