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Numerical study of asymmetric driven reconnection at dayside magnetopause

Science China(Technological Sciences) 2000年第2期43卷 129-145页

作者：金曙平沈俊太郝蕾胡先鹏 1. Department of Earth and Space Science University of Science and Technology of China 230026 Hefei China 2. Advanced Center for Earth Science and Astronomy University of Science and Technology of China Third World Academy of Science 230026 Hefei China

A two-dimensional compressible MHD code has been used to numerically study the asymmetric driven reconnection processes in the vicinity of the magnetopause. The initial magnetic field configuration is assumed to be in a mechanical equilibrium state. The cases with identical temperatures (T m0/T s0=1.0) and four different ratios of magnetic field strength (Q=B m0/B s0=1.0, 1.5, 2.0, 2.5), and the case withT m0/T s0=2.0 andQ=1.5 are investigated (B m0,T m0 andB s0,T s0 are the initial magnetic strength and temperature outside the current sheet on the magnetosphere and the magnetosheath, respectively). When the magnetic field on the magnetosheath side is set as southward, a recurrent formation of multiple magnetic bubbles with various scales occurs under the action of the inward plasma flow imposed at the left and right boundaries. In the simulation, some bubbles coalesce into a bigger one and then it is convected out of the simulation domain; the others are convected through the top boundary all alone. Thus, the plasmoid events with different scales and different time intervals take place intermittently and the impulsive features of magnetic reconnection are clearly shown. The multiple magnetic islands are all high-temperature and large-density regions in comparison with the ambient environment. The bipolar signatures or fluctuant variations of normal magnetic field component are generated by the formation of multiple magnetic islands. This result is similar to the FTEs signature.

关键词： compressible MHD code asymmetric driven reconnection dayside magnetopause.

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Ground Observations of Post-Noon Aurora: a Case Study

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Wuhan University Journal of Natural Sciences 2000年第4期5卷 441-446页

作者： Ai Yong, Wang Jing-fang, Liu Rui-yuan, Yang Hui-gen, Hu Hong-qiao, Sato Natsuo, Masayuki Kikuchi College of Electronic Information, Wuhan University, Wuhan 430072, China Polar Research Institute of China, Shanghai 200129, China National Institute of Polar Wuhan University College of Electronic Information Wuhan China (GRID:grid.49470.3e) (ISNI:***) Polar Research Institute of China Shanghai China (GRID:grid.418683.0) (ISNI:***) National Institute of Polar Research Tokyo Japan (GRID:grid.410816.a) (ISNI:***)

The characteristics of the post-noon aurora observed at Antarctic Zhongshan station on June 12, 1999, were discussed and analyzed. In the condition of the magnetic activity is not large (K p≈1), for post-noon 630.0 nm emissions, the total fluxes of soft precipitating particles were increasing from 10∶50 UT to 13∶35 UT and were decreasing from 13∶35 UT to 18∶00 UT in almost monotonous way. Away from noon, the 557.7 nm emissions increased gradually from 10∶50 UT to 17∶10 UT. The behaviors of the precipitating particles for exciting 630.0 nm aurora and 557.7 nm aurora were quite different. The peak intensity of 630.0 nm and 557.7 nm emissions appeared at about 13∶35 UT and 15∶40 UT respectively, the time difference of two peaks is about 2 h. The energy of precipitating electrons remained fairly steady until 15∶00 UT when it rose dramatically.

关键词： aurora dayside observation

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FORMATION AND STRUCTURE OF THREE DIMENSIONS OF FLUX TRANSFER EVENTS

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Chinese Science Bulletin 1988年第14期33卷 1166-1170页

作者：刘振兴胡一丁 Institute of Space Physics Academia Sinica Beijing

One of the most important finds observed by ISEE satellites (International Sun-Earth-Explorer) is the finding of the flux transfer events (FTE) at the dayside magnetopause region, which has had great influence upon the research in the couple between solar wind and the magnetosphere. Since 1978 when Russell and Elphic first published the observation results, many authors have worked on the

关键词： flux transfer events (FTE) vortex-Fesponse reconnection magnetic field reconnection dayside magnetopause magnetic vortex

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