Survey on the Magnetic Structure of the Neutral Sheets in Earth's Magnetotail  

作　　者：XIAO Chao SHEN Chao CHENG Guosheng ZHANG Hua ZHANG Ting CARR C M 

机构地区：[1]Institute of Space Weather,School of Mathematics and Statistics,Nanjing University of Information Science and Technology [2]School of Science,Harbin Institute of Technology [3]School of Atmospheric Sciences,Nanjing University of Information Science and Technology [4]Imperial College of Science,Technology and Medicine

出　　处：《空间科学学报》2016年第6期837-848,共12页Chinese Journal of Space Science

基　　金：Supported by the National Natural Science Foundation of China(41231066);Ministry of Science and Technology of China(2011CB811404);the Specialized Research Fund for State Key Laboratories of the CAS;the Scientific Research Staring Foundation for Nanjing University of Information Science and Technology(2013x030)

摘　　要：Based on the multipoint magnetic observations of Cluster from 2001 to 2004,the magnetic field structure in magnetotail Neutral Sheet(NS) is statistically surveyed.The results are as follows.In NS,a cubic function is selected to reveal the relation between y(GSM) and positional parameter z.The relation between y and magnetic field values indicates that the magnetic field is weak at midnight region and strengthens gradually at the duskside and dawnside.The relation between y and curvature radius is expressed by a quadratic function.And R_c of flattened CS is less than that of the normal CS.B_y determines the orientation of MFLs' configuration.The polar angle of the curvature vector is affected by the NS configuration.In addition,the correlation between the polar angle of the curvature vector and z is higher.The polar angle of the normal of the osculating plane is uncertain in the center area.The relation between the azimuthal angles of the curvature vector(the normal of the osculating plane) and y is negatively correlated.An empirical model applied to yz plane of the three-dimensional structure of the magnetic field lines in the NS are developed,and it is represented as a function of the positional parameter y.Finally,the current density is also statistically surveyed.Based on the multipoint magnetic observations of Cluster from 2001 to 2004,the magnetic field structure in magnetotail Neutral Sheet（NS） is statistically surveyed.The results are as follows.In NS,a cubic function is selected to reveal the relation between y（GSM） and positional parameter z.The relation between y and magnetic field values indicates that the magnetic field is weak at midnight region and strengthens gradually at the duskside and dawnside.The relation between y and curvature radius is expressed by a quadratic function.And R_c of flattened CS is less than that of the normal CS.B_y determines the orientation of MFLs＇ configuration.The polar angle of the curvature vector is affected by the NS configuration.In addition,the correlation between the polar angle of the curvature vector and z is higher.The polar angle of the normal of the osculating plane is uncertain in the center area.The relation between the azimuthal angles of the curvature vector（the normal of the osculating plane） and y is negatively correlated.An empirical model applied to yz plane of the three-dimensional structure of the magnetic field lines in the NS are developed,and it is represented as a function of the positional parameter y.Finally,the current density is also statistically surveyed.

关 键 词：Magnetic structure Statistical survey Neutral sheet Developing model 

分 类 号：P353[天文地球—空间物理学]