The Interaction Between Dipolarization Front and the Ambient Plasma

Dipolarization front (DF), usually observed at the front of bulk bursty flows (BBFs), could carry strong current and modify the current system in the near-Earth magnetotail. Understanding the physical explanation of the currents associated with DFs is important in discovering the mystery of the formation of substorm current wedge, considering that the interactions between BBFs/DFs and the ambient plasma may lead to the reduction/disruption of cross-tail currents. Magnetic decrease ahead of DF, named as magnetic dip, usually considered as the consequence of the interaction between DF and the ambient plasma. This work devotes to understand the physical explanation of the current evolution in the magnetic dip region based on THEMIS satellites. The understanding of the magnetic dip currents is vitally important for people to investigate the role of the interaction between DF and the ambient plasma in changing the magnetotail current system.