Effects of the interplanetary magnetic field clock angle on the shape of bow shock

作     者：WANG JiangYan HUANG ZhaoHui WANG Chi LIU ZiQian 

作者机构：State Key Laboratory of Space Weather Center for Space Science and Applied ResearchChinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2015年第58卷第7期

页      面：1228-1234页

核心收录：

学科分类：070802[理学-空间物理学] 07[理学] 08[工学] 080401[工学-精密仪器及机械] 0708[理学-地球物理学] 0804[工学-仪器科学与技术] 081102[工学-检测技术与自动化装置] 0811[工学-控制科学与工程] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41231067,41374172) the National Basic Research Program of China(Grant No.2012CB825602) the Specialized Research Fund for State Key Laboratories of China 

主　　题：IMF clock angle bow shock MHD simulations 

摘      要：Using the global magnetohydrodynamics(MHD) simulation model, we investigated the effects of the interplanetary magnetic field(IMF) clock angle on the shape of bow shock, including its rotational asymmetry and subsolar point. For general northward IMF( z component Bz 0), the rotational symmetry of the bow shock is broken by the effects of fast magnetosonic Mach number(Mms), and the cross-sectional line of the bow shock is an ellipse with the semi-major axis along the direction perpendicular to the IMF. The ratio or D-value between semi-major and semi-minor axis can be used to illustrate the extent of asymmetry of the bow shock. On the basis of the multiple parameters fitting, we obtain the changing relationship of both semi-axes with the clock angle and the distance away from the Earth. For general southward IMF(Bz 0, and decreases with the increasing IMF clock angle for Bz 0.