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Properties of Local Oscillations in the Lower Sunspot Atmosphere
Sych, Robert1; Zhugzhda, Yuzef2; Yan XL(闫晓理)3
发表期刊ASTROPHYSICAL JOURNAL
2020-01-10
卷号888期号:2页码:11
DOI10.3847/1538-4357/ab5a78
产权排序第3完成单位
收录类别SCI
关键词sunspot groups
摘要

We present a study of wave processes in the sunspot region NOAA 12670 on 2017 August 10 observed by the Goode Solar Telescope in the TiO 7057 A and H alpha 6563 A spectral lines. To study the distribution of power oscillations and their dynamics, we applied the pixelized wavelet filtering technique. For the first time, we obtained the spatial structure of oscillation sources as the footpoints of fine magnetic tubes, anchored in the sunspot umbra. We found that at the chromosphere level, the variation of emission is a combination of numerous independent oscillations located in the sources with small angular size. Their spatial shape varies from dots and cells in the umbra to filaments in the penumbra. Each narrow spectral harmonic corresponds to its source, without global correlation among themselves. There is a weak background as low-frequency oscillations distributed over the whole umbra. At the photosphere level we found regions with co-phased broadband oscillations of the whole umbra. Their spectrum includes the similar to 3 minutes harmonic, whose maximal value is localized in umbral dots, and the low-frequency part near a period of similar to 5 minutes. It is shown that the oscillation sources are displaced at different heights with increasing angular size. We assume that the observed spatial distribution of wave sources indicates the existence of a slow subphotospheric resonator with a vertical magnetic field in the umbra and a wave cutoff frequency due to inclination of the magnetic field line in the penumbra.

资助项目Ministry of Education and Science of the Russian Federation ; FR program II.16, RAS[KP19-270] ; Russian Foundation for Basic Research (RFBR)[17-52-80064 BRICS-a] ; NJIT ; US NSF[AGS1821294] ; Korea Astronomy and Space Science Institute ; CAS[XDB09000000] ; Seoul National University
项目资助者Ministry of Education and Science of the Russian Federation ; FR program II.16, RAS[KP19-270] ; Russian Foundation for Basic Research (RFBR)[17-52-80064 BRICS-a] ; NJIT ; US NSF[AGS1821294] ; Korea Astronomy and Space Science Institute ; CAS[XDB09000000] ; Seoul National University
语种英语
学科领域天文学 ; 太阳与太阳系 ; 太阳物理学
学科门类理学::天文学
文章类型Article
出版者IOP PUBLISHING LTD
出版地TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
ISSN0004-637X
URL查看原文
WOS记录号WOS:000520514600001
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]PHOTOELECTRIC OBSERVATIONS ; PHOTOSPHERIC OSCILLATIONS ; UMBRAL OSCILLATIONS ; AUTOMATED DETECTION ; WAVES ; POLARIZATION ; ASSOCIATION ; PROPAGATION ; ABSORPTION ; TELESCOPE
引用统计
被引频次:8[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/114a53/21626
专题抚仙湖太阳观测和研究基地
通讯作者Sych, Robert
作者单位1.Institute of Solar-Terrestrial Physics SB RAS, Irkutsk 664033, Russia
2.Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation RAS, Troitsk 108840, Russia
3.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650011, People's Republic of China
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GB/T 7714
Sych, Robert,Zhugzhda, Yuzef,Yan XL. Properties of Local Oscillations in the Lower Sunspot Atmosphere[J]. ASTROPHYSICAL JOURNAL,2020,888(2):11.
APA Sych, Robert,Zhugzhda, Yuzef,&Yan XL.(2020).Properties of Local Oscillations in the Lower Sunspot Atmosphere.ASTROPHYSICAL JOURNAL,888(2),11.
MLA Sych, Robert,et al."Properties of Local Oscillations in the Lower Sunspot Atmosphere".ASTROPHYSICAL JOURNAL 888.2(2020):11.
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