Brief Communication: The double layer in the separatrix region during magnetic reconnection
- 1School of Mathematics and Physics, Qingdao University of Science and Technology, Qingdao, Shandong 266061, China
- 2Sate Key Laboratory of Space Weather, Chinese Academy of Sciences, Beijing 100190, China
Abstract. With two-dimensional (2-D) particle-in-cell (PIC) simulations we investigate the evolution of the double layer (DL) driven by magnetic reconnection. Our results show that an electron beam can be generated in the separatrix region as magnetic reconnection proceeds. This electron beam could trigger the ion-acoustic instability; as a result, a DL accompanied with electron holes (EHs) can be found during the nonlinear evolution stage of this instability. The spatial size of the DL is about 10 Debye lengths. This DL propagates along the magnetic field at a velocity of about the ion-acoustic speed, which is consistent with the observation results.