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磁重联是能量转换的非常重要的基本等离子体物理过程之一.过去磁场重联的理论、数值模拟和观测研究,大多是集中在二维模型下进行,而实际的磁场重联涉及三维非线性过程,对于三维情况下磁场重联及其相关的奇异结构的基本性质现在还未完全解决.通过高斯积分引入Poincaré指数,将其离散化,利用Cluster四颗卫星所测得的磁场,研究了磁场重联扩散区中磁零点结构,通过计算零点位置和轨迹,估算了其运动速度和轨迹,并结合零点附近电流的特征将观测与零点重联模型进行了比较和讨论.
Magnetic reconnection is one of the most important basic plasma physics processes for energy conversion.In the past, theories, numerical simulations and observations of magnetic field reconnection mostly focused on two-dimensional models, but actual magnetic reconnection involves three-dimensional Linear process, the basic properties of the magnetic field reconnection and its related singular structure in the three-dimensional case are not yet completely solved. By introducing the Poincaré index by Gaussian integration and discretizing it, and using the magnetic field measured by the four satellites of Cluster, The magnetic zero-point structure in the reconnection region of the magnetic field is rewritten. By calculating the position and trajectory of the zero point, the velocity and the trajectory of the zero point are estimated. Based on the characteristics of the current around the zero point, the observation and the zero-point reconnection model are compared and discussed.