Formation of electron depletion layer and parallel electric field in the separatrix region of anti-parallel magnetic reconnection

• 来源期刊: 中国物理B（英文版）
• 关键词: magnetic reconnection separatrix region electron depletion layer
• 年，卷（期）: 2019,（7）
• 页码范围: 376-382
• 页数: 7页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/7/075203

摘要

It is generally accepted that during collisionless magnetic reconnection, electrons flow toward the X line in the sepa-ratrix region, and then an electron depletion layer is formed. In this paper, with two-dimensional (2D) particle-in-cell (PIC) simulation, we investigate the characteristics of the separatrix region during magnetic reconnection. In addition to the electron depletion layer, we find that there still exists an electric field parallel to the magnetic field in the separatrix region. Because a reduced ion-to-electron mass ratio and light speed are usually used in PIC simulation models, we also change these parameters to analyze the characteristics of the separatrix region. It is found that the increase in the ion-to-electron mass ratio makes the electron depletion layer and the parallel electric field more obvious, while the influence of light speed is less pronounced.