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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Acceleration and deceleration of coronal mass ejections during propagation and interaction
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Acceleration and deceleration of coronal mass ejections during propagation and interaction

机译：日冕物质抛射的加速和减速抛射在传播和互动

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摘要

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.
机译：空间天气预报的一个主要挑战社区是日冕物质的准确预测抛射(cme)诱导激波到达时间(坐)在地球环境。当前的准确性,的步骤之一理解的物理过程CME的加速和减速日球层中的传播。先前的研究的三维(3 d)磁流体动力(磁流体动力)模拟的两个相互作用的cme现实的进化环境太阳风28-31 3月期间2001事件说明这些加速度和减速过程。分析了加速和减速细节。洛伦兹力的磁压力项吗和压力梯度。部队造成减速气动阻力,太阳的引力和紧张的磁场。太阳风和之间的动量交换太阳风暴会导致加速和移动现在减速的芝加哥商品交易所进行了分析。我们在这个特定的CME事件28-31 2001年3月分析了这些部队造成CME和加速和减速与另一个芝加哥商品交易所没有交互。有显著的动量变化两者之间相互作用的太阳风暴造成的加速和减速。

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