Effect of temporal variation rate of cross polar cap potential on the equatorial ionospheric vertical drift: A statistical study

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• 作者：Wen Xiong (1)
  JiSheng Xu (1) jsxu@whu.edu.cn
  Hui Wang (1)
  Liang Xu (1)
• 关键词：equatorial ionosphere &#8211 ; temporal variation rate of cross polar cap potential &#8211 ; electric field penetration &#8211 ; ion vertical drift &#8211 ; time delay
• 刊名：SCIENCE CHINA Technological Sciences
• 出版年：2012
• 出版时间：May 2012
• 年：2012
• 卷：55
• 期：5
• 页码：1217-1223
• 全文大小：852.4 KB
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• 作者单位：1. School of Electronic Information, Wuhan University, Wuhan, 430079 China
• 刊物类别：Engineering
• 刊物主题：Chinese Library of Science
  Engineering, general
  
• 出版者：Science China Press, co-published with Springer
• ISSN：1869-1900

文摘

Based on the equatorial vertical ion drift measured by DMSP and cross polar cap potential (φ _cpc) from AMIE output during 2001 to 2003, this paper investigates the relationship of φ _cpc and its temporal variation rate (Δφ _cpc) with the disturbed ion velocity (ΔV _x ) which is the difference between the disturbed days (Kp⩾4) and quiet days (Kp<2). The statistical analysis shows: (1) The ΔV _x correlates better with Δφ _cpc than with ϕ _cpc, indicating that the electric field penetration is more easily to occur when solar wind input rapidly varies with time. (2) The optimal delay time of electric field penetration from the high-latitude magnetosphere to equatorial ionosphere has local time dependence which is longer on the nightside than on the dayside. It may be due to more complicated electrodynamic process on the nightside. (3) With the linear relationship between Δϕ _cpc and Δϕ V _x , it is obtained that the penetration efficiency is about 4.5%&#8211;13.9% at day and 31%&#8211;42% at night, coinciding well with former studies.