Acceleration and deceleration of coronal mass ejections during propagation and interaction

Acceleration and deceleration of coronal mass ejections during propagation and interaction
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传播和相互作用过程中日冕物质抛射的加速和减速

DOI:
10.1029/2012ja017776
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发表时间:
2012-11
影响因子:
--
通讯作者:
Chin-Chun Wu
Chin-Chun Wu
中科院分区:
--
文献类型:
--
作者:
Fang Shen;S. T. Wu;Xueshang Feng;Chin-Chun Wu

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空间天气预报界面临的一个主要挑战是准确预测日冕物质抛射 (CME) 引起的地球环境中的冲击波到达时间 (SAT)。为了提高当前的精度,步骤之一是了解日冕物质抛射在日光层中传播的加速和减速的物理过程。我们利用之前对三维 (3D) 磁流体动力学 (MHD) 模拟的研究,对 2001 年 3 月 28 日至 31 日事件期间真实环境太阳风中两个相互作用的日冕物质抛射的演化进行了说明,以说明这些加速和减速过程。详细分析了引起加速和减速的力。引起加速度的力是洛伦兹力和压力梯度的磁压力项。另一方面,引起减速的力是空气动力阻力、太阳引力和磁场张力。此外,太阳风和移动的日冕物质抛射之间的动量交换会导致日冕物质抛射加速和减速,现在正在分析这一点。在 2001 年 3 月 28 日至 31 日这一特定的 CME 事件中,我们分析了在与另一个 CME 相互作用和不相互作用的情况下导致 CME 加速和减速的力。它表明这两个相互作用的日冕物质抛射之间存在显着的动量变化,从而导致加速和减速。
A major challenge to the space weather forecasting community is accurate prediction of Coronal Mass Ejections (CMEs) induced Shock Arrival Time (SAT) at Earth's environment. In order to improve the current accuracy, one of the steps is to understand the physical processes of the acceleration and deceleration of a CME's propagation in the heliosphere. We employ our previous study of a three-dimensional (3D) magnetohydrodynamic (MHD) simulation for the evolution of two interacting CMEs in a realistic ambient solar wind during the period 28-31 March 2001 event to illustrate these acceleration and deceleration processes. The forces which caused the acceleration and deceleration are analyzed in detail. The forces which caused the acceleration are the magnetic pressure term of Lorentz force and pressure gradient. On the other hand, the forces which caused the deceleration are aerodynamic drag, the Sun's gravity and the tension of magnetic field. In addition the momentum exchange between the solar wind and the moving CMEs can cause acceleration and deceleration of the CME which are now analyzed. In this specific CME event 28-31 March 2001 we have analyzed those forces which cause acceleration and deceleration of CME with and without interaction with another CME. It shows that there are significant momentum changes between these two interacting CMEs to cause the acceleration and deceleration.
使用磁化等离子体斑点模型对 2000 年 4 月 CME 事件及其诱发冲击的演化进行三维 MHD 模拟
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发表时间: 2011-04
影响因子: --
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发表时间: 2004-11
期刊: Solar Physics
影响因子: 2.8
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发表时间: 2003-10
影响因子: --
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DOI: 10.1029/2007ja012320
发表时间: 2007-11
影响因子: 2.8
作者:
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发表时间: 2012-02
期刊: The Astrophysical Journal
影响因子: --
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