Technique for diagnosing the flapping motion of magnetotail current sheets based on single-point magnetic field analysis
作者单位：Key Laboratory of Earth and Planetary PhysicsInstitute of Geology and GeophysicsChinese Academy of Sciences Beijing National Observatory of Space EnvironmentInstitute of Geology and GeophysicsChinese Academy of Sciences Swedish Institute of Space Physics Space Research InstituteAustrian Academy of Sciences
会议名称：《中国科学院地质与地球物理研究所2015年度（第15届）学术年会》
会议日期：2016年
学科分类：070802[理学-空间物理学] 07[理学] 0708[理学-地球物理学]
基 金：supported by the Chinese State Scholarship Fund (201304910018) Chinese Academy of Sciences (KZZD-EW-01-2) National Key Basic Research Program of China (973 Program) grant 2011CB811405 the National Natural Science Foundation of China grant (41104114,41374180,41321003,and 41131066)
关 键 词：Technique is developed based on minimum variance analysis It is able to diagnose flapping type and propagation of kink-like flapping It might be invalid when the sheet surface is nearly horizontal or vertical
摘 要：The magnetotail current sheet is active and often flaps back and *** about the flapping motion of current sheet is essential to explore the related magnetotail dynamic processes,e.g.,plasma *** to the inability of single-point measurements to separate the spatial-temporal variation of magnetic field,the moving velocity of flapping current sheets cannot be revealed generally until the multipoint measurements are available,e.g.,the Cluster ***,currently,the flapping behaviors are hard to be resolved only relying on single-point magnetic field *** this study,with minimum variance analysis,we develop a technique based on single-point magnetic field measurement to qualitatively diagnose the flapping properties including the flapping type and the traveling direction of kink-like *** comparison with Cluster multipoint analysis via several case studies demonstrates that this technique is applicable;it should,however,be used with caution especially when the local sheet surface is either quasi-horizontal,or *** technique will be useful for the planetary magnetotail exploration where no multipoint observations are available.