Semi-annual variation of the geomagnetic field

• Malin S. R. C.

  Bogaziçi University, Kandilli Observatory and Earthquake Research Institute

• Winch D. E.

  School of Mathematics and Statistics, University of Sydney

• Iskara A. M.

  Bogaziçi University, Kandilli Observatory and Earthquake Research Institute

抄録

Nighttime hourly mean values of D, H and Z (or X, Y and Z in a fewcases) from 113 observatories for the interval 1964.0 to 1966.0 have been analyzed to determine the semi-annual variation. Results from the 84 observatories with dip latitudes between ±60°have been subjected to spherical harmonic analysis to determine the coefficients of the internal and external parts. Only those coefficients that are found to be significantly different from zero at the 5 per cent level have been included. One of the main objectives is to obtain a reliable estimate, with confidence limits, of the internal/external ratio at a very low frequency for constraining estimates of the deep conductivity of the mantle. It is shown that a model that includes only the principal P01 term can lead to a seriously misleading internal/external ratio.

収録刊行物

• Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ

  Ｅａｒｔｈ，　Ｐｌａｎｅｔｓ　ａｎｄ　Ｓｐａｃｅ 51 (5), 321-328, 1999

  地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

キーワード

• Space and Planetary Science
• Geology

詳細情報

• CRID: 1390282681486812032
• NII論文ID: 10002792221
• NII論文ID: 130003955993
• NII書誌ID: AA11211921
• DOI: 10.1186/bf03352236
• ISSN: 18805981
• ISSN: 13438832
• NDL書誌ID: 4796091
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I4796091
• Web Site: https://link.springer.com/content/pdf/10.1186/BF03352236.pdf
• Web Site: https://link.springer.com/article/10.1186/BF03352236/fulltext.html
• Web Site: http://link.springer.com/content/pdf/10.1186/BF03352236
• 本文言語コード: en
• データソース種別:
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  • NDL
  • Crossref
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