非对称磁场重联电子扩散区附近的能量通量分析  

Analysis of the Energy Flux Density near Electron Diffusion Region of Asymmetric Magnetic Field Reconnection

作　　者：王俊[1,2] 周猛[1,2] 庞烨 邓晓华[2] WANG Jun;ZHOU Meng;PANG Ye;DENG Xiaohua(School of Physics and Materials,Nanchang University,Nanchang 330031;Institute of Space Science and Technology,Nanchang University,Nanchang 330031)

机构地区：[1]南昌大学物理与材料学院,南昌330031 [2]南昌大学空间科学与技术研究院,南昌330031

出　　处：《空间科学学报》2023年第5期795-806,共12页Chinese Journal of Space Science

基　　金：国家自然科学基金重点项目(42130211);国家自然科学基金项目(42074197,41774154)共同资助。

摘　　要：磁场重联是等离子体中非常重要的能量转换过程,研究该过程中的能量转化形式及其分配十分重要。目前有很多关于对称重联中的能量通量的研究,而磁层顶的非对称重联的研究却很少,特别是多事件的统计研究。因此挑选了MMS卫星观测到的10个经过电子扩散区的磁层顶重联事件对其进行分析,结果表明在不同的事件中能量通量的分配情况不一样,但在大多数事件中,离子焓通量占主导地位,其次是坡印廷通量,离子热通量略小于坡印廷通量,离子动能通量、电子焓通量和电子热通量占比在10%以下。通过对事件进行归一化处理,得到了L方向和M方向的不同能量通量随L方向的磁场和离子速度的关系图,并分析了每种能量通量的分布特征。Magnetic reconnection is a crucial energy conversion process in plasmas,and it is important to study the forms of energy conversion and their distribution in this process.Previous research has focused mainly on the energy fluxes in symmetric reconnection,while the study of asymmetric reconnection at the Earth’s magnetopause,especially in terms of statistical analysis of multiple events,has been limited.Therefore,10 magnetic reconnection events at the magnetopause observed by MMS satellite that passed through the electron diffusion region were used for analysis.Found that the energy flux distribution varies among different events.However,in most of the events,the ion enthalpy flux is the dominant,followed by the Poynting flux.The ion heat flux is slightly smaller than the Poynting flux,and the ion kinetic energy flux,electron enthalpy flux and electron heat flux account for less than 10%of the total energy flux.By normalizing the events,obtained the relationship diagram of different energy fluxes in the L and M directions with the magnetic field and ion velocity in the L direction,and analyze the characteristic distribution of each energy flux.

关 键 词：空间等离子体 非对称磁场重联 能量通量 电子扩散区 出流区 

分 类 号：P354[天文地球—空间物理学]