On the source of the polar wind in the polar topside ionosphere: First results from the EISCAT Svalbard radar

DOI Web Site Web Site 被引用文献5件 参考文献33件 オープンアクセス
  • Y. Ogawa
    National Institute of Polar Research Tachikawa Japan
  • I. Häggström
    EISCAT Scientific Association Kiruna Sweden
  • S. C. Buchert
    Swedish Institute of Space Phyics Uppsala Sweden
  • K. Oksavik
    Arctic Geophyisic UNIS Longyearbyen Norway
  • S. Nozawa
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya Japan
  • M. Hirahara
    Department of Physics Rikkyo University Tokyo Japan
  • A. P. van Eyken
    EISCAT Scientific Association Longyearbyen Norway
  • T. Aso
    National Institute of Polar Research Tokyo Japan
  • R. Fujii
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya Japan

書誌事項

公開日
2009-12
資源種別
journal article
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2009gl041501
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We present quantitative radar observations of both hydrogen ion (H<jats:sup>+</jats:sup>) and oxygen ion (O<jats:sup>+</jats:sup>) upflow in the topside polar ionosphere using measurements that were recently carried out with the EISCAT Svalbard Radar and the Reimei satellite. H<jats:sup>+</jats:sup> upflow was clearly observed equatorward of the cusp above 500 km altitude. Within the cusp the H<jats:sup>+</jats:sup> density was very low, and the upflow was dominated by O<jats:sup>+</jats:sup> ions, but on closed field lines the H<jats:sup>+</jats:sup> became the larger contributor to the upward flux above about 550 km. The total flux seemed to be conserved, and so below 550 km altitude O<jats:sup>+</jats:sup> (with a small upward velocity of ∼50 m s<jats:sup>−1</jats:sup>) appeared to determine the upward flux which was then maintained by H<jats:sup>+</jats:sup> in the topside ionosphere. We also found that the H<jats:sup>+</jats:sup> density in the topside polar ionosphere was several times higher than current predictions of ionospheric models like IRI2001.</jats:p>

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