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Numerical study for the bursty nature of spontaneous fast reconnection
Hu YQ(呼延奇); Feng XS(冯学尚); 北京8701信箱
Source PublicationSolar Physics
KeywordFast Magnetic Reconnection Current-sheet System Computer Resistivity Evolution Dynamics Model Mhd Simulation
AbstractIn this paper, spontaneous fast reconnection in a neutral current sheet, which is initially perturbed by a localized resistivity, is studied by the newly developed Space-Time Conservation Element and Solution Element (CESE) method. After the initial perturbation is switched off, an anomalous resistivity is allowed to occur if a threshold of the local electron-ion drift velocity is exceeded. For a given threshold value, the amount of the reconnected magnetic flux introduced by the initial perturbation is very crucial for the onset of the anomalous resistivity. The numerical results indicate that fast reconnection can develop self-consistently with slow shocks extending between the diffusion region and a large-scale plasmoid-like structure, which is pushed forward by the reconnection outflow. A Petschek-like configuration is then built up, but it can not be sustained as a quasi-steady state. In fact, during the reconnection evolution, the diffusion region undergoes an elongation process so that after the dynamic process is nonlinearly saturated secondary tearing is subject to occur at the center of the system. This leads to enhanced and time-dependent reconnection. The reconnection evolution is further studied in various physical situations, also confirming the bursty nature of the spontaneous fast reconnection mechanism.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Hu YQ,Feng XS,北京8701信箱. Numerical study for the bursty nature of spontaneous fast reconnection[J]. Solar Physics,2006,238(2):329-345.
APA 呼延奇,冯学尚,&北京8701信箱.(2006).Numerical study for the bursty nature of spontaneous fast reconnection.Solar Physics,238(2),329-345.
MLA 呼延奇,et al."Numerical study for the bursty nature of spontaneous fast reconnection".Solar Physics 238.2(2006):329-345.
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