Two-and-one-half-dimensional magnetohydrodynamic simulations of the plasma sheet in the presence of oxygen ions: The plasma sheet oscillation and compressional Pc 5 waves
Two-and-one-half-dimensional magnetohydrodynamic simulations of the plasma sheet in the presence of oxygen ions: The plasma sheet oscillation and compressional Pc 5 waves
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DOI：
10.1063/1.1432697
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发表时间：
2002-01
影响因子：
2.2
通讯作者：
Li Lu;Zhen-xing Liu;Jinbin Cao
中科院分区：
文献类型：
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作者：
Li Lu;Zhen-xing Liu;Jinbin Cao
给出了含磁方程中速度旋度项的多组分等离子体片的二维和半维磁流体动力学模拟。仿真结果表明：(1)等离子体片存在周期约为400 s （pc5范围）的振荡；(2)地磁赤道是磁场扰动的节点；(3)磁能积分与内能积分反相变化；(4)扰动波向地传播速度约为10 km/s；(5)氧离子丰度影响等离子体片振荡的振幅、周期和耗散。在靠近磁赤道的等离子体层中观测到的压缩pc5波可能是由等离子体层振荡引起的，也可能是等离子体层振荡与来自外磁层的某些pc5扰动波共振产生的。
Two-and-one-half-dimensional magnetohydrodynamic simulations of the multicomponent plasma sheet with the velocity curl term in the magnetic equation are represented. The simulation results can be summarized as follows: (1) There is an oscillation of the plasma sheet with the period on the order of 400 s (Pc 5 range); (2) the magnetic equator is a node of the magnetic field disturbance; (3) the magnetic energy integral varies antiphase with the internal energy integral; (4) disturbed waves have a propagating speed on the order of 10 km/s earthward; (5) the abundance of oxygen ions influences amplitude, period, and dissipation of the plasma sheet oscillation. It is suggested that the compressional Pc 5 waves, which are observed in the plasma sheet close to the magnetic equator, may be caused by the plasma sheet oscillation, or may be generated from the resonance of the plasma sheet oscillation with some Pc 5 perturbation waves coming from the outer magnetosphere.