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arXiv 2209.06508astro-ph.SR
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过膨胀主导的日冕物质抛射形成与射电爆发

Overexpansion-dominated Coronal Mass Ejection Formation and Induced Radio Bursts

B. T. Wang, X. Cheng, H. Q. Song, M. D. Ding

摘要:

目的。日冕物质抛射(CME)是太阳系中最迷人的爆炸;然而,它们的形成仍然没有完全了解。方法.在这里,我们调查了2021年5月2007日观测良好的CME,显示出典型的三分量结构,并通过SDO/AIA(0--1.3 Rsun),PROBA 2/SWAP(0--1.7 Rsun)和MLSO/K-Cor(1.05--3 Rsun)的组合从0到3 Rsun连续观测。此外,我们还比较了CME白光亮核和EUV斑点的形态差异。最后,我们探讨了与CME过膨胀和附近流注相互作用密切相关的各种射电爆发的起源。结果一个有趣的发现是CME前沿和亮核的高度增加都是由CME形成过程中的过度膨胀所决定的。CME气泡和亮核的纵横比,量化了过度膨胀,发现随着SO/STIX 4- 10 keV和GOES 1- 8 A软X射线通量在峰值附近的增加,CME气泡和亮核的纵横比减小,表明耀斑重联在第一次过度膨胀中起重要作用。CME气泡甚至发生了第二次过膨胀,虽然相对较弱,这是密切相关的压缩与附近的流光,并可能来自一个理想的MHD过程。此外,发现CME EUV斑点比CME白光亮核相对较低和较宽,可能对应于不断增长的CME通量绳的底部。CME和流光之间的相互作用导致两个II型射电爆发,一个正常漂移和一个固定的,这被推测是在两个不同的来源的CME驱动的冲击波阵面诱导。由一系列的“C形”III型爆发证明的双向电子表明,在CME和流注的相互作用过程中也涉及交换重联。

英文摘要:

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.

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