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The origin and nature of Ultra-High Energy Cosmic Rays (UHECRs) remain unsolved in contemporary astroparticle physics. A cutoff in the cosmic ray energy spectrum clearly appears at ∼ 1020 eV in the data of HIRES, Telescope Array and Auger on ground experiments. It is well known that the detection of events with energy ≥ 1020eV is challenged by the GZK effect, which limits the highest detectable energy at ∼ 1020 eV due to photopion production in the interaction of UHECR on the microwave fossil radiation of the Big Bang, as suggested also by the HIRES and Telescope Array data, or by nuclei photodisintegration as indicated by the Auger results. However, the possibility that the cutoff at  ∼ 1020eV can be intrinsic to the acceleration power of the astrophysics cosmic ray sources remains alive. Moreover, indications of sources or excesses in the arrival direction distribution of UHECRs have been claimed by Telescope Array, in the Northern Hemisphere, and by Auger, in the Southern Hemisphere. To give an answer to these questions is rather challenging because of the extremely low flux of a few per km2 per century at extreme energies such as E > 5 × 1019eV.

The objective of the JEM-EUSO program, Joint Experiment Missions for Extreme Universe Space Observatory, is the realization of a space mission devoted to scientific research of cosmic rays of highest energies. Its super-wide-field telescope will look down from space onto the night sky to detect UV photons emitted from air showers generated by UHECRs in the atmosphere. 

More than 250 researchers from 16 countries are collaborating in JEM-EUSO, with the support  of the most important International and National Space Agencies and research funding institutions.

Overview

Meetings

The 26th JEM-EUSO International Collaboration Meeting

December 2 - 6, 2019 @RIKEN, Wako, Japan

The 25th JEM-EUSO International Collaboration Meeting

June 10 - 14, 2019 @Lodz, Poland

The 24th JEM-EUSO International Collaboration Meeting

December 3 - 7, 2018 @Kobe, Hyogo, Japan

The 23rd JEM-EUSO International Collaboration Meeting

June 11 - 15, 2018 @Mürren, Switzerland

The 22nd JEM-EUSO International Collaboration Meeting

December 4 - 8, 2017 @RIKEN, Wako, Japan

The 35th International Cosmic Ray Conference (ICRC2017)

July 12 - 20, 2017 @Busan, South Korea

The 21st JEM-EUSO International Collaboration Meeting

June 19 - 24, 2017 @University of Chicago, Chicago, USA

The 20th JEM-EUSO International Collaboration Meeting

December 12 - 16, 2016 @RIKEN, Wako, Japan

The 19th JEM-EUSO International Collaboration Meeting

June 20 - 24, 2016 @APC, Paris, France

The 18th JEM-EUSO International Collaboration Meeting

December 7 - 11, 2015 @Stockholm, Sweden

The 34th International Cosmic Ray Conference (ICRC2015)

July 30 - August 6, 2015 @Hague, The Netherlands

The 17th JEM-EUSO International Collaboration Meeting

June 22 - 26, 2015 @RIKEN, Wako, Japan

News

Mini-EUSO

Launched on Soyuz MS-13 on August 22nd, 2019. Soyuz successfully docked to ISS on August 26.

K-EUSO

Conceptual design stage has ended in 2019.

EUSO-Balloon

Launched in August 2014. Data analysis in progress.

EUSO-SPB1

Launched in April 2017. Data analysis in progress.

EUSO-SPB2

Launch is planned in 2022. Design and fabrication in progress.

EUSO-TA

Upgrade of the DAQ electronics is planned in 2019/2020. Data analysis in progress.