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Study on galactic cosmic-ray transport in outer heliosphere

Research Project

Project/Area Number 11694068
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Space and upper atmospheric physics
Research InstitutionShinshu University

Principal Investigator

YASUE Shin-ichi  Shinshu University, Faculty of Science, Physics Department, Lecturer, 理学部, 講師 (80020668)

Co-Investigator(Kenkyū-buntansha) FUJII Zenjiro  Nagoya University, STE Lab., Assistant Professor, 太陽地球環境研究所, 助手 (10022724)
KATO Chihiro  Shinshu University, Faculty of Science, Physics Department, Assistant Professor, 理学部, 助手 (50252060)
MUNAKATA Kazuoki  Shinshu University, Faculty of Science, Physics Department, Professor, 理学部, 教授 (40221618)
TANAKA Takashi  Communication Research Institute, Space Science Div., Head Researcher, 宇宙科学部, 主任研究員
WASHIMI Haruichi  Shonan Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (60023686)
藤本 和彦  名古屋大学, 太陽地球環境研究所, 助手 (10022617)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥4,700,000 (Direct Cost: ¥4,700,000)
Fiscal Year 2000: ¥2,600,000 (Direct Cost: ¥2,600,000)
Fiscal Year 1999: ¥2,100,000 (Direct Cost: ¥2,100,000)
Keywordsgalacticcosmic ray modulation / sidereal anisotropy / cosmic ray transport inheliosphere / air shower observation / cosmic ray muon detector network / 外部太陽圏 / MHDシミュレーション / 銀河宇宙線 / 太陽圏尾部 / 宇宙線観測 / 南北両半球
Research Abstract

Calculations of cosmic-ray orbits in a MHD model heliosphere showed that almost all particles with energy around 500GeV are arriving at the earth from the heliotail with their orbits significantly deflected at the magnetic wall formed in the region between the solar wind termination shock and heliopause. We also analyzed the sidereal daily variation of 10TeV cosmic-ray intensity observed by a high-count air shower ( AS ) experiment at Tibet and confirmed that the "Tail-in" component anisotropy doesn't exist in 10TeV region and diminishes with, increasing energy above 1TeV. The daily variation observed at Tibet was quite consistent with the result by the AS experiment at Mt. Norikura over 15 years, both were consistent with the "Loss-cone" component anisotropy. There was no significant energy dependence seen in the "Loss-cone" anisotropy. Tibet AS experiment also recorded a significant seasonal change in the magnitude of sidereal daily variation. This seasonal change, possibly due to earth's revolution suggests a influence of large scale solar magnetic field on cosmic-ray orbits.
Aiming to develop a new cosmic-ray muon detector, we constructed a narrow angle multidirectional telescope using 88 proportional counters in four layers and evaluated the performance. A new recording system, in which a computer determines the incident direction of every muon event, is confirmed to be enough useful for our network observation. We have also been collecting data of the stability of the system performance.
By installing a prototype multidirectional muon detector at Sao Martinho in Brazil, we extended the longitudinal coverage of the present network. The new network with the detector in Brazil, which covers a full range of pitch angle of primary cosmic-rays, is now observing precursors of geomagnetic storms.

Report

(3 results)
  • 2001 Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report
  • Research Products

    (31 results)

All Other

All Publications (31 results)

  • [Publications] K.Munakata et al.: "Enhanced sidereal diurnal variation of galactic cosmic rays observed by the two-hemisphere network of surface level muon telescopes"J. Geophys. Res.. Vol.104,No.A2. 2,511-2,519 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] D.L.Hall et al.: "Gaussian analysis of two hemisphere observations of galactic cosmic ray sidereal anisotropies"J. Geophys. Res.. Vol.104,No.A4. 6,737-6,749 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T Tanaka et al.: "Solar cycle dependence of the heliospheric shape deduced from a global MHD simulation of the interaction between a nonuniform time-dependent solar wind and the local interstellar medium"J.Geophys. Res.. Vol.104,No.A6. 12,605-12,616 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Munakata et al.: "Long term variation of cosmic ray latitude gradient in the heliosphere"Advances in Space Research. Vol.23,No.3. 459-462 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] D.L.Hall et al.: "Sidereal daily variation of galactic cosmic rays"Advances in Space Research. Vol.23,No.3. 483-486 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H.Washimi et al.: "MHD structure of the heliosphere and its response to the 11-year solar cycle variations"Advances in Space Research. Vol.23,No.3. 551-560 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Munakata et al.: "Sidereal daily variation of〜1OTeV cosmic-ray intensity observed by the Tibet air shower array"Advances in Space Research. Vol.23,No.3. 599-602 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Munakata et al.: "Gaussian analysis of two hemisphere observations of galactic cosmic ray sidereal anisotropies"Solar Wind Nine, AIP Conf. Proc. edited by S. R. Habbal, R. Esser, J. V. Hollweg, and P. A. Isenberg. Vol.471. 573-576 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Munakata et al.: "Precursors of geomagnetic storms observed by the muon detector network"J.Geophys. Res.. Vol.105,No.A12. 27,457-27,468 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] H Washimi et al.: "A V-shaped gutter on the nose-cone surface of the heliopause caused by MHD processes"Advances in Space Research. Vol.27,No.3. 509-515 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Z.Fujii et al.: "Radial diffusion coefficients and the distance to the modulation boundary for galactic and anomalous cosmic rays"Advances in Space Research. Vol.27,No.3. 559-564 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Munakata,K. et al.: "Enhanced sidereal diurnal variation of galactic cosmic rays observed by the two-hemisphere network of surface level muon telescopes"J. Geophys. Res.. 104, No. A2. 2511-2519 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hall,D.L. et al.: "Gaussian analysis of two hemisphere observations of galactic cosmic ray sidereal anisotropies"J. Geophys. Res.. 104, No. A4. 6737-6749 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Tanaka,T. et al.: "Solar cycle dependence of the hellospheric shape deduced from a global MHD simulation of the interaction between a nonuniform time-dependent solar wind and the local interstellar medium"J. Geophys. Res.. 104, No. A6. 12605-12616 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Munakata et al.: "Long term variation of cosmic ray latitude gradient in the heliosphere"Advances in Space Research. 23, No. 3. 459-462 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Hall,D.L. et al.: "Sidereal daily variation of galactic cosmic rays"Advances in Space Research. 23, No. 3. 483-486 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Washimi,H. et al.: "MHD structure of the heliosphere and its response to the 11-year solar cycle variations"Advances in Space Research. 23, No. 3. 551-560 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Munakata,K. et al.: "Sidereal daily variation of 〜10TeV cosmic-ray intensity observed by the Tibet air shower array"Advances in Space Research. 23, No. 3. 599-602 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Munakata,K. et al.: "Gaussian analysis of two hemisphere observations of galactic cosmic ray sidereal anisotropies"Solar Wind Nine, AIP Conf. Proc., Vol.471, edited by S. R. Habbal, R. Esser, J. V. Hollweg, and P. A. Isenberg. 471. 573-576 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Munakata,K. et al.: "Precursors of geomagnetic storms observed by the muon detector network"J. Geophys. Res.. 105, No. A12. 27457-27468 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Washimi,H. et al.: "A V-shaped gutter on the nose-cone surface of the heliopause caused by MHD processes"Advances in Space Research. 27, No. 3. 509-515 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Fujii,Z. et al.: "Radial diffusion coefficients and the distance to the modulation boundary for galactic and anomalous cosmic rays"Advances in Space Research. 27, No. 3. 559-564 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] D.L.Hall et al.: "Gaussian analysis of two hemisphere observations of galactic cosmic ray sidereal anisotropies"J.Geophys.Res.. Vol.104,No.A4. 6737-6749 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Tanaka et al.: "Solar cycle dependence of the heliospheric shape deduced from a global MHD simulation of the interaction between a nonuniform time-denpdent solar wind and the local interstellar medium"J.Geophys.Res.. Vol.104,No.A6. 12605-12616 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Munakata et al.: "Long term variation of cosmic ray latitude gradient in the heliosphere"Advances in Space Research. Vol.23,No.3. 459-462 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Washimi et al.: "MHD structure of the heliosphere and its response to the 11-year solar cycle variations"Advances in Space Research. Vol.23,No.3. 551-560 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Munakata et al.: "Sidereal daily variation of〜10TeV cosmic-ray intensity observed by the Tibet ait shower array"Advances in Space Research. Vol.23,No.3. 599-602 (1999)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Munakata et al.: "Precursors of geomagnetic storms observed by the muon detector network"J.Geophys.Res.. Vol.105,No.A12. 27457-27468 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] K. Munakata, D.L. Hall 他9名: "Gaussian Analysis of Two Hemisphere Observations of Galactic Cosmic Ray Anisotropies"Solar Wind Nine. 573-576 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S. Yasue, K. Munakata 他3名: "Influence of the Solar Activity on the Correlation Dimension of Underground Muon Time Series."Adv. Space Res.. 23・3. 595-598 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] K. Fujimoto, J. Okada 他4名: "Observation of Forbush Decrease by the Narrow Angle Telescope at Mt. Norikura"Proc. Int. Cosmic Ray Conf.. Vol.6. 484-487 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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