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A study of the solar activity variability in the past millennium by precise radiocarbon measurement

Research Project

Project/Area Number 14340071
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 素粒子・核・宇宙線
Research InstitutionNagoya University

Principal Investigator

MASUDA Kimiaki  Nagoya University, Solar-Terrestrial Environment Laboratory, Associate Professor, 太陽地球環境研究所, 助教授 (40173744)

Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥14,700,000 (Direct Cost: ¥14,700,000)
Fiscal Year 2004: ¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2003: ¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2002: ¥7,200,000 (Direct Cost: ¥7,200,000)
KeywordsRadiocarbon / Solar activity / Accelerator Mass spectrometry / Cosmic rays / The Maunder Minimum / The Spoerer Minimum / Little Ice Age / Climate change / 液体シンチレーション
Research Abstract

This project aimed to investigate variability of solar activity and structure of interplanetary magnetic field in the last millennium by radiocarbon in tree rings during grand minima of solar activity with accelerator mass spectrometry. For this purpose we prepared samples and measured radiocarbon content with great care on high precision and tried to find small change of radiocarbon content in the Spoerer and Maunder Minima. An accelerator mass spectrometer(AMS) of Nagoya University was used.
We took care how high precision measurement could be achieved in preparation of samples and also in operation of AMS. We could prepare samples with high quality and uniformity by using the system constructed in this project and showed that high precision of 0.2% is achievable by evaluation of standard samples. In actual measurement overall error is determined by statistical error depending on measurement time and stability of AMS. Although the machine maintenance made it difficult to try long measurements and large target current for high precision, repeat of measurement for the same tree ring samples could realize the high precision.
We measured radiocarbon content in tree ring samples from the Maunder Minimum and the Spoerer Minimum with high precision. Analysis of time sequential data gives knowledge on variation of cosmic ray flux during the solar activity minima. It was revealed that the 11-year variation of solar activity exists even in the grand minima, however, the 11-year variation could be weak in deep minima, the cycle length, which is normally 11 years, might be possibly longer in minima, and signs of reversal of solar magnetic field are seen. We also measure radiocarbon contentin the period of around AD1000. We found a periodic structure probably due to 11-year solar activity change and discussed a possibility of the effect of supernova explosion in AD1006.

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (19 results)

All 2005 2004 Other

All Journal Article (14 results) Publications (5 results)

  • [Journal Article] 樹木年輪中C-14で探るマウンダー極小期の太陽活動変動2005

    • Author(s)
      宮原ひろ子
    • Journal Title

      名古屋大学加速器質量分析計業績報告書 XVI(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 年輪中放射性炭素測定による過去の超新星爆発同定の可能性2005

    • Author(s)
      毛受弘彰
    • Journal Title

      名古屋大学加速器質量分析計業績報告書 XVI(印刷中)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Variation of solar activity during the Maunder Minimum deduced from radiocarbon content in tree rings2005

    • Author(s)
      H.Miyahara, K.Kuwana, H.Menjo, K.Masuda, Y.Muraki, T.Nakamura
    • Journal Title

      Summaries of Researches Using AMS at Nagoya University X VI(in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Possibility of supernova explosion detection with ^<14>C2005

    • Author(s)
      H.Menjo, K.Kuwana, H.Miyahara, K.Masuda, Y.Muraki, T.Nakamura
    • Journal Title

      Summaries of Researches Using AMS at Nagoya University(X VI) X VI(in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] 放射性炭素で探るマウンダー極小期の太陽活動変動2005

    • Author(s)
      宮原ひろ子
    • Journal Title

      名古屋大学加速器質量分析計業績報告書 XVI(印刷中)

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Variation of cosmic ray intensity during the Spoerer Minimum2004

    • Author(s)
      H.Miyahara
    • Journal Title

      Cosmic ray and dark matter (edited by Y.Muraki)(universal Academic Press, Tokyo)

      Pages: 49-54

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Variation of radiocarbon content in tree rings during the Spoerer Minimum2004

    • Author(s)
      H.Miyahara
    • Journal Title

      Radiocarbon 46

      Pages: 965-968

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Radiocarbon contents in tree rings during the Spoerer minimum2004

    • Author(s)
      H.Miyahara
    • Journal Title

      Nuclear Instruments and Methods B 223

      Pages: 655-659

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Cyclicity of solar activity during the Maunder Minimum deduced from radiocarbon content2004

    • Author(s)
      H.Miyahara
    • Journal Title

      Solar Physics 224

      Pages: 317-322

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Annual Research Report 2004 Final Research Report Summary
  • [Journal Article] Variation of cosmic ray intensity during the Spoerer Minimum2004

    • Author(s)
      H.Miyahara, K.Masuda, H.Furuzawa, H.Menjo, Y.Muraki, H.Kitagawa, T.Nakamura
    • Journal Title

      Cosmic rayand dark matter(edited by Y.Muraki)(Universal Academic Press, Tokyo)

      Pages: 49-54

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Variation of radiocarbon content in tree rings during the Spoerer Minimum2004

    • Author(s)
      H.Miyahara, K.Masuda, H.Furuzawa, H.Menjo, Y.Muraki, H.Kitagawa, T.Nakamura
    • Journal Title

      Radiocarbon 46

      Pages: 965-968

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Radiocarbon contents in tree rings during the Spoerer minimum2004

    • Author(s)
      H.Miyahara, K.Masuda, Y.Muraki, T.Uemura, M.Kato, H.Toyoizumi, H.Furuzawa, T.Nakamura, H.Kitagawa, E.Matsumoto
    • Journal Title

      Nucl.Instr.and Meth.B 223

      Pages: 655-659

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Cyclicity of solar activity during the Maunder Minimum deduced from radiocarbon content2004

    • Author(s)
      H.Miyahara, K.Masuda, Y.Muraki, H.Furuzawa, H.Menjo, T.Nakamura
    • Journal Title

      Solar Phys. 224

      Pages: 317-322

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Variation of cosmic ray intensity during the Spoerer Minimum2004

    • Author(s)
      H.Miyahara
    • Journal Title

      Cosmic ray and dark matter (edited by Y.Muraki) (Universal Academic Press.Tokyo)

      Pages: 49-54

    • Related Report
      2004 Annual Research Report
  • [Publications] H.Miyahara: "Variation of the radiocarbon content of tree rings during the Spoerer Minimum"Proc.28th Int.Cosmic Ray Conf.. 7. 4139-4142 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] K.Masuda: "Radiocarbon content in Japanese cedar during the Maunder Minimum"Proc.28th Int. Cosmic Ray Conf.. 7. 4143-4146 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 古澤秀樹: "太陽活動極小期における年輪中C炭素14濃度変動"名古屋大学加速器質量分析計業績報告書. XV(印刷中). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] H.Miyahara: "Radiocarbon contents in tree rings during the Spoerer minimum"Nucl Instr.and Meth.B. (In press). (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 宮原ひろ子: "シュペーラー極小期における太陽活動"名古屋大学加速器質量分析計業績報告書. XIV(未定). (2003)

    • Related Report
      2002 Annual Research Report

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Published: 2002-04-01   Modified: 2016-04-21  

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