Detailed analysis of fan-shaped jets in three dimensional numerical simulation  

作　　者：Rong-Lin Jiang K.Shibata H.Isobe Cheng Fang 

机构地区：[1]Department of Astronomy,Nanjing University,Nanjing 210093,China [2]Kwasan and Hida Observatories,Kyoto University,Yamashina,Kyoto 607-8471,Japan [3]Unit of Synergetic Studies for Space,Kyoto University,Yamashina,Kyoto 607－8471,Japan [4]Key Laboratory of Modern Astronomy and Astrophysics（Nanjing University）,Ministry of Education,Nanjing 210093,China

出　　处：《Research in Astronomy and Astrophysics》2011年第6期701-724,共24页天文和天体物理学研究（英文版）

基　　金：Supported by the National Natural Science Foundation of China (NSFC,Grant Nos. 10878002,10610099,10933003 and10673004);a grant from the National Basic Research Program of China (973 project,No. 2011CB811402);support and under the auspices of the NIFS Collaboration Research program (NIFS07KTBL005);performed with the KDK system of the Research Institute for Sustainable Humanosphere (RISH) at Kyoto University, as a collaborative research project

摘　　要：We performed three dimensional resistive magnetohydrodynamic simulations to study the magnetic reconnection using an initially shearing magnetic field configuration（force free field with a current sheet in the middle of the computational box）.It is shown that there are two types of reconnection jets：the ordinary reconnection jets and fan-shaped jets,which are formed along the guide magnetic field.The fan-shaped jets are significantly different from the ordinary reconnection jets which are ejected by magnetic tension force.There are two driving forces for accelerating the fan-shaped jets.One is the Lorentz force which initially dominates the motion of fluid elements,and then the gas pressure gradient force accelerates the fluid elements in the later stage.The dependence on magnetic reconnection angle and resistivity value has also been studied.The formation and evolution of these jets provide a new understanding of dynamic magnetohydrodynamic jets.We performed three dimensional resistive magnetohydrodynamic simulations to study the magnetic reconnection using an initially shearing magnetic field configuration（force free field with a current sheet in the middle of the computational box）.It is shown that there are two types of reconnection jets：the ordinary reconnection jets and fan-shaped jets,which are formed along the guide magnetic field.The fan-shaped jets are significantly different from the ordinary reconnection jets which are ejected by magnetic tension force.There are two driving forces for accelerating the fan-shaped jets.One is the Lorentz force which initially dominates the motion of fluid elements,and then the gas pressure gradient force accelerates the fluid elements in the later stage.The dependence on magnetic reconnection angle and resistivity value has also been studied.The formation and evolution of these jets provide a new understanding of dynamic magnetohydrodynamic jets.

关 键 词：MAGNETOHYDRODYNAMICS MHD-methods NUMERICAL 

分 类 号：O123[理学—数学] TU457[理学—基础数学]