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题名: Vertical Oscillation of a Coronal Cavity Triggered by an EUV Wave
作者: Zhang, Q. M.; Ji, H. S.
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2018
卷号: 860, 期号:2, 页码:113
英文摘要: In this paper, we report our multiwavelength observations of the vertical oscillation of a coronal cavity on 2011 March 16. The elliptical cavity with an underlying horn-like quiescent prominence was observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. The width and height of the cavity are 150 '' and 240 '', and the centroid of cavity is 128 '' above the solar surface. At similar to 17: 50 UT, a C3.8 two-ribbon flare took place in active region 11169 close to the solar western limb. Meanwhile, a partial halo coronal mass ejection erupted and propagated at a linear speed of similar to 682 km s(-1). Associated with the eruption, a coronal extremeultraviolet (EUV) wave was generated and propagated in the northeast direction at a speed of similar to 120 km s(-1). Once the EUV wave arrived at the cavity from the top, it pushed the large-scale overlying magnetic field lines downward before bouncing back. At the same time, the cavity started to oscillate coherently in the vertical direction and lasted for similar to 2 cycles before disappearing. The amplitude, period, and damping time are 2.4-3.5 Mm, 29-37 minutes, and 26-78 minutes, respectively. The vertical oscillation of the cavity is explained by a global standing MHD wave of fast kink mode. To estimate the magnetic field strength of the cavity, we use two independent methods of prominence seismology. It is found that the magnetic field strength is only a few Gauss and less than 10 G.
语种: 英语
WOS记录号: WOS:000435654900003
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/18052
Appears in Collections:太阳活动的多波段观测研究团组_期刊论文

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