Abstract
Designed as the first mission to explore the ultra-high energy universe from space, JEM-EUSO observes the Earth’s atmosphere at night to record the ultraviolet tracks generated by the extensive air showers. We present the expected geometrical aperture and annual exposure in the nadir and tilt modes for ultra-high energy cosmic rays observation as a function of the altitude of the International Space Station.
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Notes
Hereafter, Earth’s surface is referred to as the assumed Earth’s ellipsoid model and the altitude is measured from this level.
It is defined by the condition in which the geometrical aperture is > 0.8 ⋅ S ⋅ Ω for the area S and solid angle acceptance Ω defined by specific geometrical cuts.
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Acknowledgments
This work was partially supported by Basic Science Interdisciplinary Research Projects of RIKEN and JSPS KAKENHI Grant (22340063, 23340081, and 24244042), by the Italian Ministry of Foreign Affairs - General Direction for the Cultural Promotion and Cooperation, by the Deutsches Zentrum fuer Luft- und Raumfahrt, by the ‘Helmholtz Alliance for Astroparticle Physics HAP’ funded by the Initiative and Networking Fund of the Helmholtz Association (Germany), and by Slovak Academy of Sciences MVTS JEM-EUSO as well as VEGA grant agency project 2/0076/13.
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The JEM-EUSO Collaboration., Adams, J.H., Ahmad, S. et al. JEM-EUSO observational technique and exposure. Exp Astron 40, 117–134 (2015). https://doi.org/10.1007/s10686-014-9376-3
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DOI: https://doi.org/10.1007/s10686-014-9376-3