中文摘要：

二维的 particle-in-cell 模拟被执行在无碰撞的磁性的连接调查电子密度弄空的形成。在反平行的连接， out-of-plane 磁场的四极结构被形成，并且四对称的电子密度弄空层能由于 magetic 的效果沿着 separatrices 被发现镜子。随起始的指南域的增加， out-of-plane 磁场和电子密度弄空层的对称被弄歪。当起始的领队域足够地大时，沿着更低的左、上面的正确 separatrices 的电子密度弄空层消失。在指南域连接的平行电场被发现处于良好的竟技状态电子密度弄空层的如此的结构起一个重要作用。out-of-plane 磁场由和电子弄空层在的结构反平行并且领队域连接被发现在 separatrix 区域与电子流动或在里面飞机电流有关。在反平行的连接，电子沿着 separatrices 向 X 线流动，并且就在 separatrices 内沿着磁场线被指导离开 X 线。在指南地连接，电子能仅仅由于平行电场的存在沿着上面的左、更低的正确 separatrices 向 X 线流动在这些区域。

英文摘要：

Two-dimensional particle-in-cell simulations are performed to investigate the formation of electron density depletions in collisionless magnetic reconnection. In anti-parallel reconnection, the quadrupole structures of the out-of-plane magnetic field are formed, and four symmetric electron density depletion layers can be found along the separatrices due to the effects of magetic mirror. With the increase of the initial guide field, the symmetry of both the out-of-plane magnetic field and electron density depletion layers is distorted. When the initial guide field is sufficiently large, the electron density depletion layers along the lower left and upper right separatrices disappear. The parallel electric field in guide field reconnection is found to play an important role in forming such structures of the electron density depletion layers. The structures of the out-of-plane magnetic field By and electron depletion layers in anti-parallel and guide field reconnection are found to be related to electron flow or in-plane currents in the separatrix regions. In anti-parallel reeonnection, electrons flow towards the X line along the separatrices, and are directed away from the X line along the magnetic field lines just inside the separatrices. In guide field reconnection, electrons can only flow towards the X line along the upper left and lower right separatrices due to the existence of the parallel electric field in these regions.