氷床コアから復元される地磁気イベント時の宇宙線変動 Reconstruction of Cosmic Ray Variations during Geomagnetic Events from Polar Ice Core Studies

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著者

    • 阿瀬 貴博 AZE Takahiro
    • 東京工業大学大学院理工学研究科理学研究流動機構 Interactive Research Center of Science, Graduate School of Science and Engineering, Tokyo Institute of Technology

抄録

 Cosmogenic Radio Nuclides (CRNs) are produced by nuclear reactions induced by cosmic rays in the Earth's atmosphere. The production rate of CRNs varies because changes in geomagnetic field intensity and solar activity strongly influence galactic cosmic rays, especially the lower part of energy. CRNs are produced in the upper atmosphere and are deposited on ice sheets in both Greenland and Antarctica, hence, ice cores in the polar regions provide excellent records of past histories of cosmic rays because of their continuous and relatively simple depositional processes. In recent studies, high-resolution records of <sup>10</sup>Be flux from ice cores have been reported, and these revealed the continuity of 205-year solar cycles over the last glacial period. In particular, the changes induced in the production rate of CRNs by solar modulations increased during periods of low geomagnetic field intensity, such as the Laschamp geomagnetic excursion. The results obtained in this study suggest that it may be possible to obtain a better understanding of long-term solar activity through a high-resolution <sup>36</sup>Cl analysis of the polar ice sheet.

収録刊行物

  • 地學雜誌

    地學雜誌 119(3), 527-533, 2010-06-25

    公益社団法人 東京地学協会

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各種コード

  • NII論文ID(NAID)
    10030369567
  • NII書誌ID(NCID)
    AN00322536
  • 本文言語コード
    JPN
  • 資料種別
    REV
  • ISSN
    0022135X
  • NDL 記事登録ID
    10758149
  • NDL 雑誌分類
    ZM41(科学技術--地球科学)
  • NDL 請求記号
    Z15-169
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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