基于MHD模拟的地球磁层顶子午面特征研究
投稿时间: 2012-08-20  最后修改时间: 2012-08-20  点此下载全文
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作者单位E-mail
程国胜 南京信息工程大学数学与统计学院 chenggs@nuist.edu.cn 
朱琳玲 南京信息工程大学数学与统计学院  
顾斌 南京信息工程大学物理与光电工程学院  
周栋华 南京信息工程大学数学与统计学院  
基金项目:国家自然科学基金项目
中文摘要:磁层顶子午面曲线的位形特征及其随行星际条件的变化是空间天气学研究的难点之一。本文根据太阳风-磁层-电离层耦合系统的全球磁流体力学(MHD)模拟,运用电流密度判据确定磁层顶子午面位形,并研究其特征。研究发现对不同的行星际条件,径向电流密度极大值可能会出现在磁层的不同区域。我们以Boardsen2000经验模型为参照,选择不同径向磁层电流密度极值点,从而确定磁层顶的子午面结构。在此基础上,本文分析了子午面磁层顶日下点位置,极尖点高度和极尖区尾向倾角随太阳风动压及行星际磁场条件的变化规律。
中文关键词:子午面磁层顶  结构特征  磁流体力学模拟,电流密度判据
 
The study on the Characteristics of the meridian plane of magnetopause of earth based on MHD simulation
Abstract:The characteristics of the location and shape of the magnetopause in the noon-midnight meridian plane and its variations with interplanetary conditions are difficulties in space weather studies. Using the global magneto-hydrodynamics (MHD) simulations of the solar wind-magnetosphere-ionosphere system and combined with the current density criterion, the location and shape of the magnetopause in the noon-midnight meridian plane is studied in this paper. The results showed that the maximum of the current density in different radial direction may appear in different areas in magnetosphere at varying interplanetary conditions. To determine the magnetopause, the empirical model of Boardsen2000 is used as reference for the selection of the appropriate maximum points in different radial direction. In addition, we also analyze the variation of the subsolar point,the height of cusp point and the tail angle of cusp shape with the dynamic pressure of the solar wind and the interplanetary magnetic field.
keywords:Meridian plane of magnetopause, structure characteristics, MHD simulation, Current density criteria
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