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《Chinese Journal of Geophysics》 2000-01
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SU SHOU-JUN; WANG SHUI (Department of Earth and Spaces Sciences, University of Science andTechnology of China. Hpfei 230026, China)  
Using a two-dimensional, time-dependent, compressible magnetohydrodynamic simulation, magnetic reconnection driven by an emerging of magnetic flux in abipole-monopole magnetic field is studied numerically. The results show that anupward cold and dense plasmoid forms by reconnection of magnetic lines betweenbipole and monopole fields. The evolution of magnetic field leads to a whipconfiguration. The upward plasmoid falls and diffuses after reaching its maximumheight. The maximum of plasmoid velocity reaches 0.14VA and the maximum ofupward plasma velocity is about 0.27VA, where VA is the Alfven velocity at bottomboundary. The upward velocity of plasmoid increases and the process of magneticreconnection is faster when the amplitude of emerging magnetic flux increases. Thedensity enhancement in plasmoid is larger for smaller background plasma β1 (β1 isthe ratio between plasma and magnetic pressures). The effects of magnetic Lundquistnumber S between 103-106 on plasma velocity and density enhancement are notobvious. Comparing with spontaneous reconnection caused by the resistive tearinginstability, the emerging of magnetic flux is more effective to drive magneticreconnection in bipole-monopole field and leads the formation of Hα surges and X rayjets in the corona.
【Fund】: 国家自然科学基金!49774243,49830026;;国家科学技术部攀登项目
【CateGory Index】: P353
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1 ZHENG Human; SU Shoujun; WANG Shui(Department of Earth and Space Science, University of Science and Technology of China, Hefei 230026)S.T. Wu(University of Alabama in Huntsville);MAGNETOHYDRODYNAMIC SIMULATION ON FORMATION OF CORONAL SURGES[J];CHINESE JOURNAL OF SPACE SCIENCE;2000-01
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