Could the collision of CMEs in the heliosphere be super‒elastic? Validation through three‒dimensional simulations
Could the collision of CMEs in the heliosphere be super‒elastic? Validation through three‒dimensional simulations
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DOI：
10.1002/grl.50336
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发表时间：
2013-04
影响因子：
5.2
通讯作者：
F. Shen;C. Shen;Yuming Wang;Xueshang Feng;C. Xiang
中科院分区：
文献类型：
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作者：
F. Shen;C. Shen;Yuming Wang;Xueshang Feng;C. Xiang
虽然日冕物质抛射（CME）是磁化的完全电离的气体，但最近对2008年11月CME碰撞事件的观测研究表明，它们在日球层中的行为就像弹性球，它们的碰撞可能是超弹性的[C]。沈等，2012]。如果这是真的，这一发现对空间天气预报有明显的影响，因为日冕物质抛射的方向和速度可能会改变。为了验证这一点，我们通过三维MHD模拟对该事件进行了数值研究。通过比较两种情况来检验日冕物质抛射碰撞的性质。在一种情况下，两个日冕物质抛射会像观测到的那样发生碰撞，但在另一种情况下，它们不会发生碰撞。结果表明，碰撞导致两次日冕物质抛射的初始动能增加3-4%的额外动能。它有力地证明了日冕物质抛射的碰撞可能是超弹性的。
Though coronal mass ejections (CMEs) are magnetized fully ionized gases, a recent observational study of a CME collision event in 2008 November has suggested that their behavior in the heliosphere is like elastic balls, and their collision is probably superelastic [C. Shen et al., 2012]. If this is true, this finding has an obvious impact on the space weather forecasting because the direction and velocity of CMEs may change. To verify it, we numerically study the event through three‒dimensional MHD simulations. The nature of CMEs' collision is examined by comparing two cases. In one case, the two CMEs collide as observed, but in the other, they do not. Results show that the collision leads to extra kinetic energy gain by 3–4% of the initial kinetic energy of the two CMEs. It firmly proves that the collision of CMEs could be superelastic.