Project of auroral X-ray image observations using two-dimentional array of Si(Li) semiconductor detectors oleh Atsushi Nakamoto, Hiroyuki Murakami, Kiyoaki Okudaira, Yo Hirasima, Takamasa Yamagami, Shigeo Ohta, Michiyoshi Namiki, Jun Nishimura, Masahiro Kodama, Hiroshi Miyaoka, Natsuo Sato, Ryoichi Fujii