The study of nonlinear phenomena observed in the arrival time series of cosmic rays

• Project/Area Number: 19540301
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kochi University
• Principal Investigator: OHMORI Nobuharu Kochi University, 教育研究部自然科学系, 教授 (10117004)
• Co-Investigator(Kenkyū-buntansha): HONDA Ken 山梨大学, 医学工学総合研究部, 教授 (10115321) ; NAKAMURA Tooru 高知大学, 教育研究部自然科学系, 准教授 (90243815)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2008: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2007: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
• Keywords: 宇宙線 / 時系列解析 / 非線形現象 / 国際研究者交流 / ボリビア国 / 国際研究者交流 ボリビア国

Research Abstract

The existence of groups of cosmic rays, whose arrival time distribution shows chaotic character, has been reported. To confirm the existence of such phenomena ,we analyzed high frequency air shower data with more rigorous energy criterion and more suitable non-linear method As the result, we could not find the chaotic ones and all sequences of cosmic rays seems to be random ones ,except few candidates with fractal behavior. But, this conclusion depends only on data observed with a single air shower array, and is not free from analytical methods. Our new experiment, two separated air shower arrays which observe cosmic rays at the same time, will find the clear evidence of such group of cosmic rays with non-linear characters.

Research Products

• [Journal Article] Hybrid experiments with air-shower array and emulsion chamber at high mountains (2009)
  • Author(s): S.P. Besshapov, K.V. Cherdintseva, A.P. Chubenko, N.M. Nesterova, N.M. Nikolskaya, V.P. Pavluchenko, S.B. Shaulov, R.A. Nam, V.V. Piskal, N.G. Vildanov, L.I. Vildanova, J.K. Janseitova, H. Aoki, K. Honda, N. Inoue, N. Kawasumi, N. Martinic, N. Ochi, N. Ohmori
  • Journal Title: Nuclear Physics B 196巻 Pages: 118-121
  • Peer Reviewed
• [Journal Article] Hybrid experiments with air-shower array and emulsion chamber at high mountains (2009)
  • Author(s): S.P.Besshapov
  • Journal Title: Nuclear Physics B (Proc.Suppl.) 196巻 Pages: 118-121
  • Peer Reviewed
• [Journal Article] Cosmic ray nuclear interactions and EAS-triggerd families observed by the Chacaltaya hybrid experiment (2007)
  • Author(s): H. Aoki, K. Honda, N. Inoue, T. Ishii, N. Kawasumi, N. Martinic, N. Ochi, N. Ohmori
  • Journal Title: Nuclear Physics B 175巻 Pages: 174-177
  • Peer Reviewed
• [Journal Article] Cosmic ray nuclear interactions and EAS-triggerd families observed by the Chacaltaya hybrid experiment (2007)
  • Author(s): H.Aoki, K.Honda, N.Inoue, T.Ishii, N.Kawasumi, N.Martinic, N.Ochi, N.Ohmori, A.ohsawa, M.Tamada and R.Ticona
  • Journal Title: Nuclear Physics B 175 Pages: 174-177
  • Peer Reviewed
• [Presentation] チャカルタヤで観測された空気シャワー時系列の非線形解析 (2008)
  • Author(s): 大盛信晴
  • Organizer: 日本物理学会
  • Place of Presentation: 山形大小白川キャンパス
  • Year and Date: 2008-09-21
• [Presentation] チャカルタヤで観測された空気シャワー時系列の非線形解析 (2008)
  • Author(s): 大盛信晴, 日名子政人, 本田建, 川隅典雄, 井上直也, 玉田雅宣, 越智信彰, 大沢昭則, 青木宏
  • Organizer: 日本物理学会
  • Place of Presentation: 山形大学小白川キャンパス
  • Year and Date: 2008-09-21
• [Presentation] Air showers accompanied by high energy atmospheric families observed by Chacaltaya hybrid experiment (2007)
  • Author(s): H.Aoki, K.Honda, N.Inoue, T.Ishii, N.Kawasumi, N.Martinic, N.Ochi, N.Ohmori, A.ohsawa, M.Tamada, R.Ticona
  • Organizer: 30th International Cosmic Ray Conference
  • Place of Presentation: Merida, Mexico
  • Year and Date: 2007-07-03