1. Facluty of Engineering, Kanagawa University, Yokohama
2. Research Institute for Science and Engineering, Waseda University, Tokyo
3. Department of Electronic Information Systems, Shibaura Institute of Technology, Saitama
4. National Institute of Radiological Sciences, Chiba
5. Institute of Space and Astronautical Science, JAXA, Kanagawa
6. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, China
7. National Institute of Polar Research, Tokyo
8. Department of Physics, Yokohama National University, Kanagawa
9. Department of Physics and Mathematics, Aoyama Gakuin University, Kanagawa
10. Kanagawa Univ. of Human Services, Kanagawa
11. Department of Physics, Saitama University, Saitama
12. Department of Physics, Rikkyo University, Tokyo
13. Institute for Cosmic Ray Research, University of Tokyo, Chiba