Sources of UHECRs in view of the TUS and JEM-EUSO experiments
N. N. Kalmykov, B. A. Khrenov, G. V. Kulikov, M. Yu. Zotov

TL;DR
This paper reviews astrophysical models of ultra-high-energy cosmic ray origins and discusses how upcoming orbital experiments TUS and JEM-EUSO can provide data to resolve this longstanding scientific puzzle.
Contribution
It offers a comprehensive overview of models and highlights the potential of new orbital experiments to identify UHECR sources.
Findings
Upcoming experiments can distinguish between different astrophysical models.
New data may identify specific sources of UHECRs.
Orbital experiments will enhance understanding of cosmic ray origins.
Abstract
The origin of ultra-high-energy cosmic rays (UHECRs) is one of the most intriguing problems of modern cosmic ray physics. We briefly review the main astrophysical models of their origin and the forthcoming orbital experiments TUS and JEM-EUSO, and discuss how the new data can help one solve the long-standing puzzle.
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