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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >A simulation study of dynamics in the distant Jovian magnetotail
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A simulation study of dynamics in the distant Jovian magnetotail

机译：遥远的动力学仿真研究木星的磁尾

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摘要

In late February 2007, the New Horizons spacecraft flew past Jupiter and repeatedly observed tailward moving plasma structures in Jupiter's distant ail (x > -2000 R_J). There were no solar wind observations in the outer solar system at this time. In this study, we have used a new magnetohydrodynamic model with a 1500 R_J long tail to investigate the propagation of these structures under different solar wind conditions. In the simulation we find that periodic plasmoid ejection from a reconnection line in Jupiter's plasma sheet can occur when the solar wind dynamic pressure is low and the IMF has a northward component along the dipole direction. In particular, periodic plasmoids which are similar to New Horizon observations are reproduced when the interplanetary magnetic field (IMF) was oscillating from northward to southward with a 10 h period similar to what would be expected for a rotating planetary magnetic field interacting with an IMF with only a y component. When the IMF had a southward component along the dipole direction, high-latitude reconnection can form plasmoid-like structures. As a result plasma structures moving tailward can be found over a large region of the tail, as is observed. Oscillations in the solar wind dynamic pressure lead to oscillations in the plasma sheet.
机译：在2007年2月底,新视野号宇宙飞船飞过去的木星,反复观察tailward等离子体结构在木星的移动遥远的苦恼(x > -2000 R_J)。风在太阳系外围观察这一次。长1500 R_J磁流体动力模型尾巴调查的传播在不同的太阳风条件下结构。在模拟我们发现周期性等离子粒团退出一个连接在木星的线当太阳风等离子体片可能发生动态压力较低,国际货币基金组织向北组件沿着偶极子方向。特别是,周期性的等离子粒团类似于新视野观察当行星际磁场重现(国际货币基金组织(IMF)振荡从北到南用10 h时期类似期待一个旋转的行星磁场与国际货币基金组织的交流只有一个y分量。当国际货币基金组织(IMF)向南组件沿偶极子方向,高纬度地区重新连接即可形成plasmoid-like结构。结构可以找到tailward越过大区域的尾巴,观察。动态压力振荡的太阳风导致等离子体振荡。

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