The LAAS network observation for studying time correlations in extensive air showers

Nobuaki Ochi; A. Iyono; Hitoomi Kimura; Takeharu Konishi; Toru Nakamura; Takao Nakatsuka; Soji Ohara; Nobuharu Ohmori; Katsuhiko Saito; Nobusuke Takahashi; Shuhei Tsuji; Tomonori Wada; Isao Yamamoto; Yoshihiko Yamashita; Yukio Yanagimoto

doi:10.1117/12.458539

3 March 2003 The LAAS network observation for studying time correlations in extensive air showers

Nobuaki Ochi, A. Iyono, Hitoomi Kimura, Takeharu Konishi, Toru Nakamura, Takao Nakatsuka, Soji Ohara, Nobuharu Ohmori, Katsuhiko Saito, Nobusuke Takahashi, Shuhei Tsuji, Tomonori Wada, Isao Yamamoto, Yoshihiko Yamashita, Yukio Yanagimoto

Author Affiliations +

Proceedings Volume 4858, Particle Astrophysics Instrumentation; (2003) https://doi.org/10.1117/12.458539
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

The Large Area Air Shower (LAAS) group has been performing a network observation of extensive air showers (EAS) since 1996 in Japan. Ten compact EAS arrays are operating simultaneously at distant stations (up to ≈1000 km) and detecting EAS with mean energy of ≈10¹⁵ eV. Each station has 4--12 scintillation counters and a Global Positioning System (GPS), which provides time stamps of EAS triggers with an accuracy of 1μs. As a consequence of the comparable time stamps, uniformly-adjusted detectors and a standardized data format among all stations, we can treat the independent observations as a gigantic EAS detector system as a whole. The primary purpose of the network observation is to study large-scale correlations in ultra-high-energy cosmic rays. On the other hand, three nearby stations within 1~km distance at Okayama area have a possibility to detect extremely-high-energy EAS (≈10¹⁹ eV) as coincident triggers of the three stations. The present status of the network and some results from computer simulations are reported here.

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Nobuaki Ochi, A. Iyono, Hitoomi Kimura, Takeharu Konishi, Toru Nakamura, Takao Nakatsuka, Soji Ohara, Nobuharu Ohmori, Katsuhiko Saito, Nobusuke Takahashi, Shuhei Tsuji, Tomonori Wada, Isao Yamamoto, Yoshihiko Yamashita, and Yukio Yanagimoto "The LAAS network observation for studying time correlations in extensive air showers", Proc. SPIE 4858, Particle Astrophysics Instrumentation, (3 March 2003); https://doi.org/10.1117/12.458539

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