Effect of solar wind variation on low‐energy O<sup>+</sup> populations in the magnetosphere during geomagnetic storms: FAST observations

DOI Web Site Web Site 被引用文献5件
  • Y. Yao
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya, Aichi Japan
  • K. Seki
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya, Aichi Japan
  • Y. Miyoshi
    Solar‐Terrestrial Environment Laboratory Nagoya University Nagoya, Aichi Japan
  • J. P. McFadden
    Space Sciences Laboratory University of California Berkeley California USA
  • E. J. Lund
    Space Science Center University of New Hampshire Durham New Hampshire USA
  • C. W. Carlson
    Space Sciences Laboratory University of California Berkeley California USA

書誌事項

公開日
2008-04
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2007ja012681
公開者
American Geophysical Union (AGU)

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説明

<jats:p>The relationship between solar wind conditions and variations in low‐energy (<28 keV) O<jats:sup>+</jats:sup> ions during magnetic storms was investigated based on Fast Auroral Snapshot (FAST) observations. We selected four magnetic storms in 2000 using the following criteria: 1. the time profile of the <jats:italic>Dst</jats:italic> is simple (no multiple main phase), 2. the FAST orbit has a good coverage in the midnight and/or dusk side sector, and 3. middle‐latitude (ILAT > 45°) particle data are available. For each orbit in the course of the four magnetic storms, the simultaneous solar wind data are compiled and the effects of each solar wind parameter such as the dynamic pressure, the dawn‐dusk electric field, the velocity, and the density are investigated. The results indicate a strong correlation between the pressure and density of low‐energy O<jats:sup>+</jats:sup> ions in the ring current region and the storm intensity, which is consistent with previous studies on high‐energy (>50 keV) O<jats:sup>+</jats:sup> ions. The solar wind dynamic pressure also plays an important role in O<jats:sup>+</jats:sup> pressure and density enhancement in the ring current and plasma sheet regions.</jats:p>

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