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Proceedings Paper

The LAAS network observation for studying time correlations in extensive air showers
Author(s): 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
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Paper 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.

Paper Details

Date Published: 3 March 2003
PDF: 12 pages
Proc. SPIE 4858, Particle Astrophysics Instrumentation, (3 March 2003); doi: 10.1117/12.458539
Show Author Affiliations
Nobuaki Ochi, Okayama Univ. of Science (Japan)
A. Iyono, Okayama Univ. of Science (Japan)
Hitoomi Kimura, Okayama Univ. of Science (Japan)
Takeharu Konishi, Kinki Univ. (Japan)
Toru Nakamura, Kochi Univ. (Japan)
Takao Nakatsuka, Okayama Shoka Univ. (Japan)
Soji Ohara, Nara Univ. of Industry (Japan)
Nobuharu Ohmori, Kochi Univ. (Japan)
Katsuhiko Saito, Ashikaga Institute of Technology (Japan)
Nobusuke Takahashi, Hirosaki Univ. (Japan)
Shuhei Tsuji, Kawasaki Medical School (Japan)
Tomonori Wada, Okayama Univ. (Japan)
Isao Yamamoto, Okayama Univ. of Science (Japan)
Yoshihiko Yamashita, Okayama Univ. (Japan)
Yukio Yanagimoto, Okayama Univ. (Japan)

Published in SPIE Proceedings Vol. 4858:
Particle Astrophysics Instrumentation
Peter W. Gorham, Editor(s)

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