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题名: OBSERVATIONS OF OPPOSITELY DIRECTED UMBRAL WAVEFRONTS ROTATING IN SUNSPOTS OBTAINED FROM THE NEW SOLAR TELESCOPE OF BBSO
作者: Su, J. T.1; Ji, K. F.2; Cao, W.3; Banerjee, D.4; Priya, T. G.1; Zhao, J. S.5; Bai, X. Y.1; Chen, J.1; Zhang, M.1; Ji, H. S.6
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2016-02-01
卷号: 817, 期号:2
关键词: Sun: chromosphere ; Sun: magnetic fields ; Sun: oscillations ; sunspots
DOI: 10.3847/0004-637X/817/2/117
文章类型: Article
英文摘要: We study the umbral waves as observed by chromospheric imaging observations of two sunspots with the New Solar Telescope at the Big Bear Solar Observatory. We find that the wavefronts (WFs) rotate clockwise and form a one-armed spiral structure in the first sunspot, whereas two-and three-armed structures arise in the second sunspot where the WFs rotate anticlockwise and clockwise alternately. All the spiral arms display propagation outwards and become running penumbral waves once they cross the umbral boundaries, suggesting that the umbral and penumbral waves propagate along the same inclined field lines. We propose that the one-armed spiral structure may be produced by the WF reflections at the chromospheric umbral light bridge, and the multi-armed spirals may be related to the twist of the magnetic field in the umbra. Additionally, the time lag of the umbral oscillations in between the data of He I 10830 angstrom and H alpha -0.4 angstrom is similar to 17 s, and it is similar to 60 s for that in between the data of 304 angstrom and H alpha - 0.4 angstrom. This indicates that these disturbances are slow magnetoacoustic waves in nature, and that they propagate upward along the inclined lines with fast radial expansions causing horizontal velocities of the running waves.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: RUNNING PENUMBRAL WAVES ; VERTICAL MAGNETIC-FIELD ; REGION IMAGING SPECTROGRAPH ; ISOTHERMAL STRATIFIED ATMOSPHERE ; HIGH-RESOLUTION OBSERVATIONS ; CHROMOSPHERIC SUNSPOT ; PHOTOELECTRIC OBSERVATIONS ; MAGNETOACOUSTIC WAVES ; SHOCK FORMATION ; LIGHT BRIDGES
收录类别: SCI
项目资助者: CAS(XDB09000000) ; National Basic Research Program of China(2011CB8114001 ; NJIT ; US NSF(AGS-1250818) ; NASA(NNX13AG14G) ; Korea Astronomy and Space Science Institute and Seoul National University ; strategic priority research program of CAS ; XDB09040200 ; 11373040 ; 11373044 ; 11273034 ; 11303048 ; 11178005 ; 11573012 ; AGS-0847126 ; NSFC-1142830911427901)
语种: 英语
WOS记录号: WOS:000369437900034
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/16137
Appears in Collections:太阳和太阳系等离子体研究团组_期刊论文

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作者单位: 1.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
2.Kunming Univ Sci & Technol, Kunming 650093, Peoples R China
3.Big Bear Solar Observ, 40386 North Shore Lane, Big Bear City, CA 92314 USA
4.Indian Inst Astrophys, Bangalore 560034, Karnataka, India
5.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
6.Chinese Acad Sci, Key Lab Dark Matter & Space Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
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