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OBSERVATIONS OF OPPOSITELY DIRECTED UMBRAL WAVEFRONTS ROTATING IN SUNSPOTS OBTAINED FROM THE NEW SOLAR TELESCOPE OF BBSO
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
2016-02-01
发表期刊ASTROPHYSICAL JOURNAL
卷号817期号:2
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.
文章类型Article
关键词Sun: Chromosphere Sun: Magnetic Fields Sun: Oscillations Sunspots
WOS标题词Science & Technology ; Physical Sciences
DOI10.3847/0004-637X/817/2/117
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
语种英语
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)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000369437900034
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/16137
专题太阳和太阳系等离子体研究团组
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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Su, J. T.,Ji, K. F.,Cao, W.,et al. OBSERVATIONS OF OPPOSITELY DIRECTED UMBRAL WAVEFRONTS ROTATING IN SUNSPOTS OBTAINED FROM THE NEW SOLAR TELESCOPE OF BBSO[J]. ASTROPHYSICAL JOURNAL,2016,817(2).
APA Su, J. T..,Ji, K. F..,Cao, W..,Banerjee, D..,Priya, T. G..,...&Ji, H. S..(2016).OBSERVATIONS OF OPPOSITELY DIRECTED UMBRAL WAVEFRONTS ROTATING IN SUNSPOTS OBTAINED FROM THE NEW SOLAR TELESCOPE OF BBSO.ASTROPHYSICAL JOURNAL,817(2).
MLA Su, J. T.,et al."OBSERVATIONS OF OPPOSITELY DIRECTED UMBRAL WAVEFRONTS ROTATING IN SUNSPOTS OBTAINED FROM THE NEW SOLAR TELESCOPE OF BBSO".ASTROPHYSICAL JOURNAL 817.2(2016).
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