The effect of the guide field on energy conversion during collisionless magnetic reconnection  

作　　者：Hui Xiao ZhiHong Zhong Meng Zhou YongYuan Yi LiangJin Song Ye Pang XiaoHua Deng 

机构地区：[1]School of Physics and Materials Science,Nanchang University,Nanchang 330031,China [2]Institute of Space Science and Technology,Nanchang University,Nanchang 330031,China [3]School of Resources and Environment,Nanchang University,Nanchang 330031,China

出　　处：《Earth and Planetary Physics》2023年第4期436-444,共9页地球与行星物理（英文版）

基　　金：supported by the National Natural Science Foundation of China (NSFC) under Grants 42074197, 42130211, 42104156, and 41774154;the China Postdoctoral Science Foundation under Grant 2021M691395

摘　　要：Magnetic reconnection is well known as an efficient mechanism for transferring magnetic energy into plasma energy.However,how the energy conversion and partition between different species is influenced by the shear angle of the reconnecting magnetic component(i.e.,the guide field strength)is not well understood.Using 2.5-dimensional particle-in-cell simulations,we investigated the energy conversion in reconnection with different guide fields.We found that the overall energy conversion first decreases steeply and then increases slowly when the guide field increases fromB_(g)=0 toB_(g)=4.The increase in energy conversion in the large guide field regime is due to the electron energy gain through the perpendicular channelJ_(⊥)·E_(⊥).The overall energy conversion is predominantly contributed byJ_(⊥)·E_(⊥) rather thanJ||E||.We further find that energy conversion mainly occurs within the reconnection front and the flux pileup region.However,the contribution from the fore reconnection front becomes important in large guide field regimes(3<B_(g)≤4)because of the enhanced electron energy gain.

关 键 词：collisionless magnetic reconnection energy conversion guide field particle-in-cell simulation 

分 类 号：P352[天文地球—空间物理学]