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Plasmoid-like structures in multiple X line Hall MHD reconnection
Liu, C. X.; Jin, S. P.; 魏奉思.; Lu, Q. M.; Yang, H. A.; 北京8701信箱
Source PublicationJournal of Geophysical Research-Space Physics
KeywordFlux Rope Geotail Observations Driven Reconnection Magnetic-field Evolution Simulation Substorm
AbstractDriven by a waveform inflow, multiple X line reconnection is initiated in a long current layer, and the plasmoids are bound between two neighboring reconnection sites. We investigate the behaviors of the plasmoid-like structures in the absence and presence of an initial guide field B-y0 normalized by B-0 (B-0 is the initial intensity of B-x field at the top and bottom boundaries of the simulation domain) using a Hall magnetohydrodynamic (MHD) code. For the case with B-y0 = 0 the profiles of the out-of-plane B-y component are the bipolar signature or the bipolar wavelike signature which is caused by Hall effect and independent of the external mechanism. Such B-y features are in line with the observed signature of a closed-loop-like plasmoid in the magnetotail. The bipolar and fluctuation signatures of B-y have an asymmetric feature in the presence of a small B-y0(= 0.1), and the B-y profile becomes a positive signature as B-y0 reaches or exceeds 0.3. In the case of B-y0 = 0.5, a B-y bulge appears in the B-y signature when the enhanced B-y regions caused by Hall effect take place in the plasmoid. The B-y bulge evolves into a peaking signature, whose maximum (B-y vertical bar(max)) is quickly raised and approaches the lobe magnetic field strength. Such a significant enhancement of the B-y component in the central region of the plasmoid might be representative of the observed strong core field in the magnetic flux rope. The present results indicate the following implications: (1) Hall effect and a preexisting cross-tail component B-y are two important factors controlling the occurrence of various plasmoid-like structures in the magnetotail. (2) In the later phase the nonlinear interaction between Hall effect and the B-y flux added by the plasma inflow makes a most important contribution to the growth of the core B-y field.
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
Liu, C. X.,Jin, S. P.,魏奉思.,et al. Plasmoid-like structures in multiple X line Hall MHD reconnection[J]. Journal of Geophysical Research-Space Physics,2009,114:A10208.
APA Liu, C. X.,Jin, S. P.,魏奉思.,Lu, Q. M.,Yang, H. A.,&北京8701信箱.(2009).Plasmoid-like structures in multiple X line Hall MHD reconnection.Journal of Geophysical Research-Space Physics,114,A10208.
MLA Liu, C. X.,et al."Plasmoid-like structures in multiple X line Hall MHD reconnection".Journal of Geophysical Research-Space Physics 114(2009):A10208.
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