@article{oai:nipr.repo.nii.ac.jp:00006377,
 author = {Nakamura, Tomokazu and Ebihara, Yusuke and Ejiri, Masaki and Kadokura, Akira and Matsumoto, Naoki and Matsuzaka, Yukihiro and Mukai, Kenji and Murakami, Hiroyuki and Nakagawa, Michio and Namiki, Michiyoshi and Oshima, Naoya and Saito, Yoshitaka and Sato, Natsuo and Suzuki, Hiromu and Takahashi, Wataru and Uchida, Masami and Yamagami, Takamasa and Yamagishi, Hisao and Yamamoto, Mikio and Yamauchi, Makoto},
 journal = {Advances in polar upper atmosphere research},
 month = {Aug},
 note = {P(論文), In the Polar Patrol Balloon (PPB) project, two balloons named PPB-8 and -10 were launched in rapid succession to form a cluster of balloons during their flight on January 13, 2003, from Syowa Station, Antarctica. In order to make the two-dimensional images for auroral X-rays and to obtain the energy spectra of auroras with energy range from 30 keV to 778 keV, the same instruments for hard X-rays were installed on PPB-8 and -10, respectively. These detection systems observed several auroral X-ray events during the flight. In particularly on January 25, 2003, strong auroral events were detected at about 0919 UT by PPB-10 and at 0927 UT by PPB-8. The aurora observed by PPB-10 was observed after about 8 min by PPB-8 located a 650 km west of PPB-10. The energy spectra of the bright aurora at 0919 UT and 0927 UT for PPB-10 and -8 is obtained as E0 = (78+-5) keV and (70+-5) keV, respectively.},
 pages = {10--22},
 title = {Observations of hard X-rays of auroral origin with Polar Patrol Balloons No. 8 and 10},
 volume = {18},
 year = {2004}
}