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Distribution of ionospheric O+ ion in synchronous altitude region

  • Jiankui Shi 
  • Zhenxing Liu 
  • Zhang T. L. 
  • Jianshan Guo 
  • Manlian Zhang 
  • Sheping Shang 
  • Xigui Luo 
Article

Abstract

Based on satellite observation data, using dynamics equation, the ionospheric O+ ion’s distribution in the synchronous altitude region for different geomagnetic activity indexK p is studied by theoretical modeling and numerical analyzing, and semi-empirical models for the O+ ion’s density and flux versus longitude in the synchronous altitude region for differentK p are given. The main results show that in the synchronous altitude region: (i) The O+ ion’s density and flux in day-side are larger than those in nightside. (ii) With longitude changing, the higher the geomagnetic activity indexK p is, the higher the O+ ion’s density and flux, and their variation amplitude will be. The O+ ion’s density and flux whenK p 6 will be about ten times as great as that whenK p = 0. (iii) WhenK p = 0 orK p 6, the O+ ion’s density reaches maximum at longitudes 120° and 240° respectively, and minimum in the magnetotail. WhenK p = 3−5, the O+ ion’s density gets to maximum at longitude 0°, and minimum in the magnetotail. However, the O+ ion’s flux reaches maximum at longitude 120° and 240° respectively, and minimum in the magnetotail for anyK p value.

Keywords

ionospheric O+ ion synchronous altitude longitude distribution features 

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Copyright information

© Science in China Press 2003

Authors and Affiliations

  • Jiankui Shi 
    • 1
  • Zhenxing Liu 
    • 1
  • Zhang T. L. 
    • 2
  • Jianshan Guo 
    • 1
  • Manlian Zhang 
    • 1
  • Sheping Shang 
    • 1
  • Xigui Luo 
    • 1
  1. 1.Center for Space Science and Applied ResearchChinese Academy of SciencesBeijingChina
  2. 2.Space Research InstituteAustrian Academy of SciencesGraz

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