| 木星磁尾重联产生的磁通量管向内运动的数值模拟 |
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| 引用本文： | 蔡彬,陈出新.木星磁尾重联产生的磁通量管向内运动的数值模拟[J].地球物理学报,2019,62(5):1573-1581. |
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| 作者姓名： | 蔡彬 陈出新 |
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| 作者单位： | 中国科学技术大学 地球和空间科学学院, 合肥 230026 |
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| 基金项目： | 国家自然科学基金（41374179）资助. |
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| 摘 要： | 本文通过利用包含离心力的自洽、轴对称稳态木星磁层模型,以及等离子体细丝运动理论对磁尾重联产生的磁通量管向内输运进行研究.基于细丝运动理论模型,通过MHD数值模拟我们可以得到磁通量管随时间变化的许多特性.模拟结果表明,重联产生的磁通量管向内运动可到达10RJ以内,磁通量管赤道部分的速度可以达到350km·s-1左右,表现出很强的向行星方向的流动.初始磁通量管中的等离子体密度和压强均小于周围介质,随着它迅速向木星方向运动,它的等离子体密度由于体积压缩逐渐上升,等离子体压强则逐渐上升到与周围介质相当.磁通量管在电离层上足点向赤道方向的运动滞后于它在赤道面上向行星方向的运动.
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| 关 键 词： | 木星磁尾 等离子体径向输运 高速流 磁通量管 |
| 收稿时间： | 2018-09-10 |
Numerical simulation on the inward motion of magnetic flux tube produced by reconnection in Jupiter's magnetotail |
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| CAI Bin,CHEN ChuXin.Numerical simulation on the inward motion of magnetic flux tube produced by reconnection in Jupiter's magnetotail[J].Chinese Journal of Geophysics,2019,62(5):1573-1581. |
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| Authors: | CAI Bin CHEN ChuXin |
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| Institution: | School of Earth and Space Sciences, University of Science and Technology of China, Heifei 230026, China |
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| Abstract: | In this paper, through utilizing the self-consistent axisymmetric stationary model of the Jovian magnetosphere including the effect of centrifugal force, the inward motion of the flux tube generated by reconnection was studied via applying the "theory of thin filament motion". Based on the thin filament model, some properties of time development of magnetic flux tube can be obtained from the magnetohydrodynamic (MHD) numerical simulation. The results show that the flux tube generated by reconnection can reach within 10RJ, the velocity of the portion of the flux tube near the equator can reach 350 km·s-1, and the motion of the flux tube displays a strong planetward flow. Though the density and plasma pressure in the flux tube initially is lower than its neighbors, its density increases gradually owing to compression of volume and plasma pressure rises to values comparable to its neighbors as it moves quickly towards Jupiter. The equatorward motion of the ionospheric end of the flux tube is delayed relative to its motion toward Jupiter in the equatorial plane. |
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| Keywords: | Jupiter magnetotail Plasma radial transport High speed flow Magnetic flux tube |
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