Estimation of magnetospheric plasma ion composition for 1956–1975 by using high time resolution geomagnetic field data created from analog magnetograms

DOI Web Site Web Site 参考文献35件
  • K. Yamamoto
    Department of Geophysics, Graduate School of Science Kyoto University Kyoto Japan
  • M. Nosé
    Data Analysis Center for Geomagnetism and Space Magnetism, Graduate School of Science Kyoto University Kyoto Japan
  • N. Mashiko
    Kakioka Magnetic Observatory Japan Meteological Agency Ibaraki Japan
  • K. Morinaga
    Kakioka Magnetic Observatory Japan Meteological Agency Ibaraki Japan
  • S. Nagamachi
    Kakioka Magnetic Observatory Japan Meteological Agency Ibaraki Japan

書誌事項

公開日
2016-06
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/2016ja022510
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>This study addresses the ion composition in the magnetosphere before the satellite era. We estimate the plasma ion mass for 1956–1975 from the period of low‐latitude Pi2 pulsations found in digital geomagnetic field data that are created from analog magnetograms at Kakioka. The period of investigation covers most of solar cycle 19 and the whole solar cycle 20. To consider long‐term variation, the moving average of the estimated plasma ion mass is calculated with a 1 year time window. We find that 1 year moving average of the plasma ion mass changed by a factor of ∼2 during one solar cycle (i.e., between ∼1.1 amu and ∼2.4 amu for solar cycle 19 and between ∼1.1 amu and ∼2.0 amu for solar cycle 20). The correlation coefficient between the 1 year moving average of the plasma ion mass and that of the <jats:italic>F</jats:italic><jats:sub>10.7</jats:sub> index is 0.86. This result supports the idea that in long‐term variation, solar radiation increases the density and the temperature of O<jats:sup>+</jats:sup> ions in the ionosphere, leads to the outflow of O<jats:sup>+</jats:sup> ions, and contributes to the enhancement of the plasma ion mass in the nightside magnetosphere. The digital data created from analog magnetograms provide an important clue to know the space environment in old days and are advantageous for studies of the space weather and space climate.</jats:p>

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