论文标题
在ICME-HSS相互作用区域观察Alfven波
Observation of Alfven wave in ICME-HSS interaction region
论文作者
论文摘要
Alfvén波（AW）是从太阳发出的太阳风中最常见的波动。此外，已经观察到多次观察到星际冠状质量射血（ICME）和高速流（HSS）之间的相互作用。但是，这种互动可以产生AW吗？在这种情况下，AW的本质仍然是一个悬而未决的问题。为了回答这一点，我们研究了1999年10月21日在Wind Spacecraft在1 AU观察到的ICME-HSS交互事件。我们已经使用Walén测试来识别AW和估计的Elsasser变量，以找到AWS的特征。我们明确地发现，ICME在Sunward AWS上占主导地位，而尾随的HSS具有强大的反肺AW。我们建议ICME-HSS相互作用变形ICME的MC，从而导致MC内的AWS。此外，ICME早期阶段内的重新连接的存在也可能是其内部AW起源的主要原因。
The Alfvén wave (AW) is the most common fluctuation present within the emitted solar wind from the Sun. Moreover, the interaction between interplanetary coronal mass ejection (ICME) and high-speed stream (HSS) has been observed on several occasions. However, can such interaction generate an AW? What will be the nature of AW in such a scenario remains an open question. To answer it, we have investigated an ICME-HSS interaction event observed on 21st October 1999 at 1 AU by Wind spacecraft. We have used the Walén test to identify AW and estimated Elsasser variables to find the characteristics of the AWs. We explicitly find that ICME were dominant with Sunward AWs, whereas the trailing HSS has strong anti-Sunward AW. We suggest that the ICME-HSS interaction deforms the MC of the ICME, resulting in the AWs inside the MC. In addition, the existence of reconnection within the ICME early stage can also be the leading cause of the origin of AW within it.
