论文标题
过度膨胀主导的冠状质量弹出形成和诱导的无线电爆发
Overexpansion-dominated Coronal Mass Ejection Formation and Induced Radio Bursts
论文作者
论文摘要
目标。冠状质量弹出（CME）是太阳系中最迷人的爆炸。但是，它们的形成仍然尚未完全理解。方法。在这里，我们研究了2021年5月7日观察到的CME，该CME显示了典型的三组分结构，并通过SDO/AIA（0--1.3 RSUN），Proba2/swap（0--1.7 rsun）和MLSO/K-COR（MLSO/K-COR（1.05--3 Rsun）的组合，从0到3 rsun不断观察到。此外，我们比较了CME白光明亮核心和EUV BLOB之间的形态差异。最后，我们探讨了与CME过度扩张与附近流媒体的相互作用密切相关的各种无线电爆发的起源。结果。一个有趣的发现是，CME领先前部和明亮核心的高度均由CME组中的过度扩张所主导。发现CME气泡和明亮的核心的纵横比量化过度膨胀，随着SO/Stix 4--10 KeV的降低，并获得1--8的1--8 A峰附近相关耀斑的软X射线通量增加，表明在第一个过度膨胀中，Flare重新连接的重要作用。 CME气泡甚至发生了第二次过度膨胀，尽管相对较弱，这与附近流媒体的压缩密切相关，并且很可能是由理想的MHD过程引起的。此外，发现CME EUV斑点比CME白色明亮核心相对较低且宽，可能对应于生长的CME通量绳的底部。 CME与流媒体之间的相互作用导致了两种II型无线电爆发，一种通常漂移和一个静止，据推测是在CME驱动的冲击阵线的两个不同来源诱导的。通过一系列“ C形” III型爆发证明的双向电子表明，在CME和流媒体的相互作用中，互换重新连接也涉及。
Aims. Coronal Mass Ejections (CMEs) are the most fascinating explosion in the solar system; however, their formation is still not fully understood. Methods. Here, we investigate a well-observed CME on 2021 May 07 that showed a typical three-component structure and was continuously observed from 0 to 3 Rsun by a combination of SDO/AIA (0--1.3 Rsun), PROBA2/SWAP (0--1.7 Rsun) and MLSO/K-Cor (1.05--3 Rsun). Furthermore, we compare the morphological discrepancy between the CME white-light bright core and EUV blob. In the end, we explore the origin of various radio bursts closely related to the interaction of the CME overexpansion with nearby streamer. Results. An interesting finding is that the height increases of both the CME leading front and bright core are dominated by the overexpansion during the CME formation. The aspect ratios of the CME bubble and bright core, quantifying the overexpansion, are found to decrease as the SO/STIX 4--10 keV and GOES 1--8 A soft X-ray flux of the associated flare increases near the peaks, indicating an important role of the flare reconnection in the first overexpansion. The CME bubble even takes place a second overexpansion although relatively weak, which is closely related to the compression with a nearby streamer and likely arises from an ideal MHD process. Moreover, the CME EUV blob is found to be relatively lower and wider than the CME white-light bright core, may correspond to the bottom part of the growing CME flux rope. The interaction between the CME and the streamer leads to two type II radio bursts, one normally drifting and one stationary, which are speculated to be induced at two different sources of the CME-driven shock front. The bidirectional electrons evidenced by series of "C-shaped" type III bursts suggest that the interchange reconnection be also involved during the interaction of the CME and streamer.
