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High-frequency Oscillations in the Atmosphere above a Sunspot Umbra
Wang, Feng1,2; Deng, Hui1; Li, Bo3; Feng, Song1,2; Bai, Xianyong4; Deng LH(邓林华)5; Yang, Yunfei2; Xue ZK(薛志科)5; Wang R(王瑞)5; Feng, Song, Email: feng.song@astrolab.cn
发表期刊ASTROPHYSICAL JOURNAL LETTERS
2018-03-20
卷号856期号:1
DOI10.3847/2041-8213/aab4f3
产权排序第5完成单位
收录类别SCI
关键词Magnetohydrodynamics (Mhd) - Sunspots Supporting Material Animation
摘要We use high spatial and temporal resolution observations, simultaneously obtained with the New Vacuum Solar Telescope and Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory, to investigate the high-frequency oscillations above a sunspot umbra. A novel time-frequency analysis method, namely, the synchrosqueezing transform (SST), is employed to represent their power spectra and to reconstruct the high-frequency signals at different solar atmospheric layers. A validation study with synthetic signals demonstrates that SST is capable of resolving weak signals even when their strength is comparable to the high-frequency noise. The power spectra, obtained from both SST and the Fourier transform, of the entire umbral region indicate that there are significant enhancements between 10 and 14 mHz (labeled as 12 mHz) at different atmospheric layers. Analyzing the spectrum of a photospheric region far away from the umbra demonstrates that this 12 mHz component exists only inside the umbra. The animation based on the reconstructed 12 mHz component in AIA 171 angstrom illustrates that an intermittently propagating wave first emerges near the footpoints of coronal fan structures, and then propagates outward along the structures. A time-distance diagram, coupled with a subsonic wave speed (similar to 49 km s(-1)), highlights the fact that these coronal perturbations are best described as upwardly propagating magnetoacoustic slow waves. Thus, we first reveal the high-frequency oscillations with a period around one minute in imaging observations at different height above an umbra, and these oscillations seem to be related to the umbral perturbations in the photosphere.
项目资助者National Natural Science Foundation of China(11463003, 11503080, 11761141002, 41474149, 41674172) ; NSFC(U1531132, U1531140, U1631129) ; National Key Research and Development Program of China(U1531132, U1531140, U1631129, 2016YFE0100300) ; CAS Key Laboratory of Solar Activity of National Astronomical Observatories(KLSA201715)
语种英语
学科领域天文学
文章类型Article
ISSN2041-8205
URL查看原文
WOS记录号WOS:000428392300007
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
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被引频次:1[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/12309
专题抚仙湖太阳观测站
通讯作者Feng, Song, Email: feng.song@astrolab.cn
作者单位1.School of Physics and Electronic Engineering, Guangzhou University, Guangzhou 510006, People's Republic of China
2.Yunnan Key Laboratory of Computer Technology Application/Faculty of Information Engineering and Automation, Kunming University of Science and Technology, Kunming 650500, People's Republic of China
3.Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, People's Republic of China
4.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing 100012, People's Republic of China
5.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People's Republic of China
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Wang, Feng,Deng, Hui,Li, Bo,et al. High-frequency Oscillations in the Atmosphere above a Sunspot Umbra[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,856(1).
APA Wang, Feng.,Deng, Hui.,Li, Bo.,Feng, Song.,Bai, Xianyong.,...&Feng, Song, Email: feng.song@astrolab.cn.(2018).High-frequency Oscillations in the Atmosphere above a Sunspot Umbra.ASTROPHYSICAL JOURNAL LETTERS,856(1).
MLA Wang, Feng,et al."High-frequency Oscillations in the Atmosphere above a Sunspot Umbra".ASTROPHYSICAL JOURNAL LETTERS 856.1(2018).
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