Mesa, Utah, United States at one of the Telescope Array fluorescence detectors in March 2013 (first observations in 2015). The experiment was on-going in 2018. The experiment has detected some UHECR-events (Ultra High Energy Cosmic Ray). EUSO-Balloon: a balloon-based EUSO telescope meant to further validate the technology. The balloon flight took place in 2014 in Canada and lasted 5 hours. The telescope observed laser-simulated cosmic ray events. EUSO-SPB (EUSO-Super Pressure Balloon): a high-altitude heavy-lift balloon EUSO telescope. Launched in 2017 from New Zealand (EUSO-SPB1-mission). The flight took 13 days, but was cut substantially shorter than the planned 100 days. Second mission (EUSO-SPB2) is planned for 2021. TUS (Tracking Ultraviolet Setup): a Russian mission on board the Lomonosov-satellite (launched 2016); included in the EUSO program as of 2018 (originally was not part of EUSO program). Mini-EUSO: an ultraviolet telescope operated at the ISS. The telescope serves as a pathfinder mission for UCHER-missions in space and maps the ultraviolet background produced by Earth atmosphere. The mapping of the UV-background is important for the follow-up missions K-EUSO and JEM-EUSO. The mission started as a co-operation between Italian Space Agency and Russian Space Agency. The Mini-EUSO telescope was launched to ISS on 22 August 2019. K-EUSO (KLYPVE-EUSO; KLYPVE is a Russian acronym for extreme energy cosmic rays): a Russian Space Agency project to place an UHECR telescope in the Russian segment of ISS. The project builds upon the TUS-experiment of the Russian Lomonosov-satellite. In 2017, the launch was scheduled for 2022. JEM-EUSO (Japanese Experiment Module-EUSO): the final goal of the JEM-EUSO program is to have the JEM-EUSO telescope installed into ISS. POEMMA (Probe Of Multi-Messenger Astrophysics): a dedicated satellite mission (2 satellites) to observe UHECR-events in the atmosphere. As of 2018, it is a NASA-sponsored concept study. References External links JEM-EUSO webpage ESA EUSO webpage High energy particle telescopes Components of the International Space Station International Space Station experiments Space telescopes