Magnetic configuration in ion diffusion region

To put it simply, magnetic reconnection is characterized by the sharp change of magnetic configuration from anti-parallel shape to interconnected shape. However, the present of guide field before reconnection onset and Hall field during reconnection onset make the magnetic configuration related to reconnection more complicated. In this presentation, utilizing the 4-points Cluster magnetic measurements and applying the Magnetic Rotation Analysis (MRA), we investigate the spacial variaty of physical parameters reflecting how the magnetic field lines in ion diffusion region distribute and configure: magnetic gradient and direction, curvature direction and curvature radius. Based on the resulted parameters, for the first time, we recover the quantified map of magnetic configuration in ion diffusion regions. The behavior of particles in ion diffusion region can be reevaluated in the frame of the achieved magnetic configuration.