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《Chinese Journal of Geophysics》 1994-02
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NUMERICAL STUDIES FOR MAGNETIC RECONNECTION IN A GRAVITATIONAL FIELD(I).FORMATION AND MERGING OF THE MAGNETIC ISLANDS

WANG SHUI; LI SHUO-JUN; ZHBNG HUI-NAN (Department of Earth and Space Science, University of Science and Technology of China, Hefei 230026)  
In this paper,a magnetic reconnection caused by the resistance tearing instability in a gravitational field has been studied numerically.The results show that the magnetic reconnection with two X lines existed near the two ends of the current sheet, which has the length L-1H and the half-width δ-H/24,occured,and the magnetic island and the plasmoid with high temperature and high density formed.The magnetic island width increases with the time.A t≈55τA the magnetic island width approaches the saturation and the maximum width is about 4δ.At the same time , from t≈37τA the center position Of magnetic island dropes gradually, and at t≈57τA the coalescence instsbility happened. This leads to the merging of magnetic island with the closed region of magnetic field near the bottom of computational domain,and causes the annihilation of magnetic field and the rapid release of magnetic energy.On the other hand, due to the effects of the gravitational field and the plasma nonuniform, the plasma upflow velocity,which inCreases with the time, reaches 1.14VA∞ near the top of computational domain. domain. The maximum, of plasma downward velocity in the magnetic islang approches 1.14VA∞.It is larger than the local Sound Speed, and the fast Shock may be formed in front of magnetic island.These results may explain the formation of post-flare loops for the two-ribbon flares, the annihilation of magnetic field and the release of magnetic energy, and the red shift observed in the Doppler velocity map.
【Fund】: 国家自然科学基金
【CateGory Index】: P315.1
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