The JEM-EUSO Program for UHECR Studies from Space

To take up the challenge of understanding origin ultra-high-energy cosmic rays (UHECRs), new observational means appear necessary. The JEM-EUSO Collaboration has undertaken to open space road UHECR studies. For more than a decade, it been developing realistic program measure UHECRs from with unprecedented aperture, together complementary scientific objectives in broader multidisciplinary context. Several intermediate missions have already completed (on ground: EUSO-TA; under stratospheric ballons: EUSO-Balloon and EUSO-SPB1; space: TUS, on-board ISS: MINI-EUSO), others are preparation for flight (EUSO-SPB2), review (K-EUSO: currently on hold), or proposed next decade (POEMMA). We report general status program, underlining that its technology now reached operational maturity, is ready actual cosmic-ray shower detection above.