The JEM-EUSO Project: Observing Extremely High Energy Cosmic Rays and Neutrinos from the International Space Station

Ebisuzaki, Toshikazu; Uehara, Yuriko; Ohmori, Hitoshi; Kawai, K.; Kawasaki, Y.; Sato, M.; Takizawa, Y.; Bertaina, M.; Kajino, F.; Sawabe, Tomoaki; Inoue, K.; Sasaki, Akiyuki; Sakata, M.; Yamamoto, Y.; Nagano, M.; Inoue, N.; Shibata, T.; Sakaki, N.; Uchihori, Y.; Takahashi, Yoshiyuki; Shimizu, Hideyuki; Arai, Y.; Kurihara, Y.; Fujimoto, H.; Yoshida, Shigeru; Mizumoto, Y.; Inoue, Susumu; Asano, Katsuaki; Sugiyama, T.; Watanabe, J.; Ikeda, Hirokazu; Suzuki, M.; Imamura, Takeshi; Yano, H.; Murakami, T.; Yonetoku, Daisuke; Itow, Y.; Taguchi, Makoto; Nagata, M.; Nagataki, Shigehiro; Abe, Shinsuke; Tajima, T.; Adams, J. H.; Mitchell, S.; Christl, M. J.; Watts, J. W.; English, A.; Pitalo, K.; Hadaway, James B.; Geary, J.; Readon, P.; Crawford, H. J.; Pennypacker, C.; Arisaka, K.; Cline, D.; Gorodetsky, P.; Salin, P.; Patzark, T.; Maurissen, A.; Valentin, M.

doi:10.1016/j.nuclphysbps.2007.11.005

Cited by 28 publications

(8 citation statements)

References 2 publications

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“…Large statistics can also reduce the uncertainty of estimated n s (E) significantly (Takami & Sato 2008). Future large UHECR experiments to target UHECRs above 10 20 eV such as Extreme Universe Space Observatory (JEM-EUSO) (Ebisuzaki et al 2008) and the Northern site of the Pierre Auger Observatory (Blümer & the Pierre Auger Collaboration 2010) will give important information to constrain the properties of transient UHECR sources.…”

Section: Uhecr Burst Rate and Apparent Source Densitymentioning

confidence: 99%

The Role of Structured Magnetic Fields on Constraining Properties of Transient Sources of Ultra-High-Energy Cosmic Rays

Takami

Murase

2012

ApJ

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We study how the properties of transient sources of ultra-high-energy cosmic rays (UHECRs) can be accessed by exploiting UHECR experiments, taking into account the propagation of UHECRs in magnetic structures which the sources are embedded in, i.e., clusters of galaxies and filamentary structures. Adopting simplified analytical models, we demonstrate that the structured extragalactic magnetic fields (EGMFs) play crucial roles in unveiling the properties of the transient sources. These EGMFs unavoidably cause significant delay in the arrival time of UHECRs as well as the Galactic magnetic field, even if the strength of magnetic fields in voids is zero. Then, we show that, given good knowledge on the structured EGMFs, UHECR observations with high statistics above 10 20 eV allow us to constrain the generation rate of transient UHECR sources and their energy input per burst, which can be compared with the rates and energy release of known astrophysical phenomena. We also demonstrate that identifying the energy dependence of the apparent number density of UHECR sources at the highest energies is crucial as a clue to such transient sources. Future UHECR experiments with extremely large exposure are required to reveal the nature of transient UHECR sources.

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Section: Uhecr Burst Rate and Apparent Source Densitymentioning

confidence: 99%

The Role of Structured Magnetic Fields on Constraining Properties of Transient Sources of Ultra-High-Energy Cosmic Rays

Takami

Murase

2012

ApJ

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“…JEM-EUSO will yield a large aperture of approximately 2×10 5 km 2 sr [2]. Hence, it will improve the statistics in the ultra high energy regime of the cosmic ray spectrum with several hundred events > 5 × 10 19 eV [3]. At the same time, its lower energy threshold at 3 × 10 19 eV allows for cross-calibration with nowadays UHECR observatories.…”

Section: The Jem-euso Missionmentioning

confidence: 99%

The Angular Resolution of the JEM-EUSO Mission: an updated view

Mernik¹,

Guzmán²,

Santangelo³

et al. 2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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for the JEM-EUSO CollaborationThe Extreme Universe Observatory onboard the Japanese Experiment Module (JEM-EUSO) is a mission being developed to observe ultra high energy cosmic rays (UHECRs) from space. JEM-EUSO consists of a wide field of view UV-telescope, assisted by an atmospheric monitoring system, designed to be mounted oboard the International Space Station. JEM-EUSO will observe the extensive air showers (EAS) induced by UHE cosmic particles with energies above 3 × 10 19 eV by using the earth's atmosphere as a large detector. Due to the amount of monitored target volume JEM-EUSO is expected to reach an effective aperture of approx. 2 × 10 5 km 2 sr. During its lifetime, the mission will measure several hundred events with E > 5 × 10 19 eV significantly improving the statistics of the most energetic part of the spectrum above the observed cut-off. In the context of the JEM-EUSO Collaboration different mission profiles are being explored. A configuration actively investigated is a telescope, mainly based on the same technologies already employed in the baseline instrument, which can be launched with the SpaceX Falcon 9 rocket and transported to the ISS by the Dragon spacecraft. This new mission configuration allows a circular design of the optics which improves the performances. In this paper we present a brief study of the expected angular resolution of this new configuration.

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“…Its primary objective is the observation of UHECR induced air showers from space by taking advantage of the earth's atmosphere. Due to the large target volume monitored, JEM-EUSO will be able to measure cosmic rays with energies around the GZK cut-off [1,2] to a sufficient extent. The detector itself collects the fluorescence and Cherenkov photons that are emitted from the developing showers in the wavelength range between 300 to 400 nm (Fig.…”

Section: The Jem-euso Missionmentioning

confidence: 99%

“…To analyse how the signal changes when we tilt the telescope by 20 • and by 40 • from the nadir direction, we simulated air showers with a fixed energy (10 20 eV) and zenith angle (Θ=60 • ) to use it as a standard candle. The simulations are done with the ESAF software 1 . The brightness of these showers is well defined when we use a parametrised shower simulation approach combination with a parametrised photon propagator in the atmosphere.…”

Section: Tilted Mode Studies 21 Signal Behaviourmentioning

confidence: 99%

The Expected Angular Resolution Performance of the Tilted JEM-EUSO Instrument

Mernik

Cabrera²,

Santangelo³

et al. 2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

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JEM-EUSO (The Extreme Universe Observatory onboard the Japanese Experiment Module) is a space borne UV-telescope for the observation of UHECR induced extensive air showers (EAS). Currently in the development phase it will be attached to the ISS (International Space Station) to use the earth's atmosphere as a large detector. Due to the large target volume it gains an effective aperture of approx. 2 × 10 5 km 2 sr-sufficient for the CR observation above an energy of 3 × 10 19 eV. During the mission lifetime, JEM-EUSO will observe several hundred of events above E = 5 × 10 19 eV, significantly improving the statistics in this part of the UHECR spectrum. The default operation mode of the instrument is envisaged to be along its nadir direction. However, in a later stage of the mission, a tilting of the telescope, away from its nadir direction, is discussed as a potential strategy to further increase the exposure at the highest energies. In the tilted mode operation the exposure would significantly increase. Hence, the regime of extreme energies above 10 20 eV could be explored in a reasonable amount of time. Naturally, in this setup the angular resolution of the instrument is expected to decrease. In the scope of this work we evaluate the expected angular resolution performance of the JEM-EUSO instrument in dependence of the tilting angle.

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The JEM-EUSO Project: Observing Extremely High Energy Cosmic Rays and Neutrinos from the International Space Station

Cited by 28 publications

References 2 publications

The Role of Structured Magnetic Fields on Constraining Properties of Transient Sources of Ultra-High-Energy Cosmic Rays

The Role of Structured Magnetic Fields on Constraining Properties of Transient Sources of Ultra-High-Energy Cosmic Rays

The Angular Resolution of the JEM-EUSO Mission: an updated view

The Expected Angular Resolution Performance of the Tilted JEM-EUSO Instrument

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