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题名: Simultaneous Transverse and Longitudinal Oscillations in a Quiescent Prominence Triggered by a Coronal Jet
作者: Zhang, Q. M.; Li, D.; Ning, Z. J.
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2017
卷号: 851, 期号:1, 页码:47
DOI: 10.3847/1538-4357/aa9898
英文摘要: In this paper, we report our multiwavelength observations of the simultaneous transverse and longitudinal oscillations in a quiescent prominence. The prominence was observed by the Global Oscillation Network Group and by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory on 2015 June 29. A GOES C2.4 flare took place in NOAA active region 12373, which was associated with a pair of short ribbons and a remote ribbon. During the impulsive phase of the flare, a coronal jet spurted out of the primary flare site and propagated in the northwest direction at an apparent speed of similar to 224 km s(-1). Part of the jet stopped near the remote ribbon. The remaining part continued moving forward before stopping to the east of the prominence. Once the jet encountered the prominence, it pushed the prominence to oscillate periodically. The transverse oscillation of the eastern part (EP) of prominence can be divided into two phases. In phase I, the initial amplitude, velocity, period, and damping timescale are similar to 4.5 Mm, similar to 20 km s(-1), similar to 25 minutes, and similar to 7.5 hr, respectively. The oscillation lasted for two cycles. In phase II, the initial amplitude increases to similar to 11.3 Mm, while the initial velocity halves to similar to 10 km s(-1). The period increases by a factor of similar to 3.5. With a damping timescale of similar to 4.4 hr, the oscillation lasted for about three cycles. The western part of prominence also experienced transverse oscillation. The initial amplitude is only similar to 2 Mm and the velocity is less than 10 km s(-1). The period (similar to 27 minutes) is slightly longer than that of the EP in phase I. The oscillation lasted for about four cycles with the shortest damping timescale (similar to 1.7 hr). To the east of prominence, a handful of horizontal threads experienced longitudinal oscillation. The initial amplitude, velocity, period, and damping timescale are similar to 52 Mm, similar to 50 km s(-1), similar to 99 minutes, and 2.5 hr, respectively. To our knowledge, this is the first report of simultaneous transverse and longitudinal prominence oscillations triggered by a coronal jet.
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17887
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