Abstract
JEM-EUSO, the Extreme Universe Space Observatory, on-board the Japanese Experiment Module of the ISS (International Space Station), is expected, within this decade, to explore the ultra-high energy (UHE) Universe with unprecedentedly large effective area and uniform exposure. In this paper, we summarize the scientific context of the mission and its scientific requirements. We then report: 1) on the status of the instrument, describing the most recent technical developments; and 2) on the mission aspects of the observatory. In addition, we will present the current programmatic status.
Highlights
In any post- Pierre Auger Observatory scenario, observations of Ultra High Energy Cosmic Rays (UHECRS) from space are likely to be essential
We summarize the scientific context of the mission and its scientific requirements
UHECRs space observatories naturally provide a 4 sky coverage, and assuming a duty cycle ∼ 20%, the currently expected trigger efficiencies, and an operation time of about five years, they can reach an exposure of Aexp ∼ 106 km2 sr yr
Summary
In any post- Pierre Auger Observatory scenario, observations of Ultra High Energy Cosmic Rays (UHECRS) from space are likely to be essential. “SOCRAS” generated the Orbiting Wide-angle Light collector concept (OWL) in the US and the AIRWATCH program in Europe, which after a few years led to the Extreme Universe Space Observatory (EUSO) mission concept. The mission was designed for the ESA’s Columbus module onboard the International Space Station (ISS) and was characterized by an Aexp ∼ (1.3 ÷ 3.2) ×105 km2sr yr. EUSO was found technically ready to proceed into phase B, ESA did not continue the mission mainly due to programmatic uncertainties related to the ISS. In 2004, the EUSO mission concept was reoriented in order to be accommodated on the Exposed facility of the Japanese Experiment module (JEM) of the ISS, known as KIBO (in English Hope).
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