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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Simulation of magnetic cloud erosion during propagation
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Simulation of magnetic cloud erosion during propagation

机译：模拟磁云在侵蚀传播

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We examine a three-dimensional (3-D) numerical magnetohydrodynamic (MHD) simulation describing a very fast interplanetary coronal mass ejection (ICME) propagating from the solar corona to 1 AU. In conjunction with its high speed, the ICME evolves in ways that give it a unique appearance at 1 AU that does not resemble a typical ICME. First, as the ICME decelerates far from the Sun in the solar wind, filament material at the back of the flux rope pushes its way forward through the flux rope. Second, diverging nonradial flows in front of the filament transport poloidal flux of the rope to the sides of the ICME. Third, the magnetic flux rope reconnects with the interplanetary magnetic field (IMF). As a consequence of these processes, the flux rope partially unravels and appears to evolve to an entirely unbalanced configuration. At the same time, filament material at the base of the flux rope moves forward and comes in direct contact with the shocked plasma in the CME sheath. We find evidence that such remarkable behavior has actually occurred when we examine a very fast CME that erupted from the Sun on 2005 January 20. In situ observations of this event near 1 AU show very dense cold material impacting the Earth following immediately behind the CME sheath. Charge state analysis shows this dense plasma is filament material. Consistent with the simulation, we find the poloidal flux (Bz) to be entirely unbalanced, giving the appearance that the flux rope has eroded. The dense solar filament material and unbalanced positive IMF Bz produced a number of anomalous features in a moderate magnetic storm already underway, which are described in a companion paper by Kozyra et al. (2014).
机译：我们检查一个三维(3 d)的数值磁流体动力(磁流体动力)模拟描述非常快的星际日冕物质抛射从日冕(ICME)传播1 AU。ICME结合其高速度发展的方式,给它一个独特的外观1非盟这并不像一个典型的ICME。首先,随着ICME减慢远离太阳在太阳风,灯丝的材料通量绳推动其前进的道路通量绳。前面的灯丝交通极向通量绳子ICME的两侧。重新连接时,磁通量绳子行星际磁场(IMF)。这些过程的结果,通量绳部分拆解,似乎演变完全不平衡的配置。时间,灯丝材料的底部通量绳前进和直接接触在芝加哥商品交易所震惊等离子体鞘。找到证据表明这种非凡的行为实际发生当我们检查一个非常快的芝加哥商品交易所从太阳爆发于2005年1月20日。1 AU显示附近的原位观察的事件非常密集的冷物质影响地球后立即在CME鞘。分析显示这稠密等离子体电荷状态灯丝的材料。模拟,我们发现极向通量(Bz)完全不平衡,给的样子通量绳已不复存在。灯丝材料和不平衡的积极的国际货币基金组织(IMF)产生的异常特征中等磁暴已经展开,同伴的一篇论文中描述了Kozyra等

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