High energy electron observation by polar patrol balloon flight in Antarctica

Shoji Torii, Tadahisa Tamura, Kenji Yoshida, Hisashi Kitamura, Takamasa Yamagami, Hiroyuki Murakami, Nobuhito Tateyama, Jun Nishimura, Yoshitaka Saito, Shigeo Ohta, Michiyoshi Namiki, Yukihiko Matsuzaka, Issei Iijima, Masaki Ejiri, Hisao Yamagishi, Akira Kadokura, Makio Shibata, Yusaku Katayose, Katsuaki Kasahara, Kohei MizutaniTadashi Kobayashi, Yoshiko Komori, Toshinori Yuda, Jin Chang

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We accomplished a balloon observation of the high-energy cosmic-ray electrons in 10-1000 GeV to reveal the origin and the acceleration mechanism. The observation was carried out for 13 days at an average altitude of 35km by the Polar Patrol Balloon (PPB) around Antarctica in January 2004. The detector is an imaging calorimeter composed of scintillating-fiber belts and plastic scintillation counters sandwiched between lead plates. The geometrical factor is about 600 cm 2sr, and the total thickness of lead absorber is 9 radiation lengths. The performance of the detector has been confirmed by a test flight at the Sanriku Balloon Center and by an accelerator beam test using the CERN-SPS (Super Proton Synchrotron at CERN). The new telemetry system using the Iridium satellite, the power system supplied by solar panels and the automatic flight level control operated successfully during the flight. We collected 5.7 × 10 3 events over 100 GeV, and selected the electron candidates by a preliminary data analysis of the shower images. We report here an outline of both detector and observation, and the first result of the electron energy spectrum over 100 GeV obtained by an electronic counter.

Original languageEnglish
Pages (from-to)52-62
Number of pages11
JournalAdvances in Polar Upper Atmosphere Research
Issue number20
Publication statusPublished - 2006 Aug
Externally publishedYes


  • Antarctica
  • Balloon observation
  • Cosmic ray
  • High energy electron

ASJC Scopus subject areas

  • Atmospheric Science
  • Earth-Surface Processes


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