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《Chinese Journal of Geophysics》 1994-03
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NUMERICAL SIMULATION OF TURBULENT RECONNECTION AT THE MAGNETOPAUSE

FU SUI-YAN ; PU ZU-YIN(Department of Geophysics and Center for Nonlinear Science,Peking University,Beijing 100871)LIU ZHEN-XING(Center for Space Science and Application Research,Academia Sinica,Beijing, 100080)  
A 2-D MHD simulation model is presented to study turbulent reconnectlon at the magnetopause. A new turbulent reconnection model is proposed.Numerical simulation shows that, if(1) a sheared flow and a current sheet simultaneously exist at the magnetopause,(2) the magnetopause current sheet Is an open system, and(3)the Reynolds and magnetic Reynolds number(R and Rm) in the transition region are greater than some critical values,the reconnection process possesses a strong turbulent feature,leading to the appearance of irregular meso and small-scale structures (IMSSSs). The larger Rm and R are,the more IMSSSs are produced.The stronger the velocity is, the quicker IMSSSs occur. Large and meso-scale structures can break into meso and small-scale ones as Rm and R are substantially increased. Based on our simulation results, we expect that quasi-steady state reconnection,transient and patchy reconnection,and turbulent reconnection may all take place at the magntopause;large,meso and small-scale structures may all be found there. Turbulent reconnection and meso andsmall-scale structures may play an important role in energy,momentum and mass transport from the solar wind to the magnetosphere.
【Fund】: 国家自然科学基金 国家科委攀登计划"非线性科学"亦给予部分资助
【CateGory Index】: P183.5
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