Magnetic reconnection triggered in a localized region across the current sheet in the magnetotail

Magnetic reconnection is found to be initiated by the electron dynamics recently in the magnetotail. As the electron current layer is generated, it is still unclear when and where the reconnection will be triggered. In this talk, I will show one example of such an evolving process of the electron current layer. It is found that the reconnection is triggered in a localized area away from the current sheet center where the reconnection is supposed to be triggered based on the strong energy dissipation, electron crescent distribution. Furthermore, the lower hybrid waves are detected in the location where the reconnection is triggered and cause the strong energy dissipation. The observations indicate that the reconection is triggered by the lower hybrid waves.