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Observations of Running Penumbral Waves Emerging in a Sunspot

文献类型：期刊论文

作者Priya, T. G.5,6; Robert, Erdelyi1,2; Deng Yuanyong5,6; Mao Xinjie3,6; Chen Jie6; Su Jiangtao5,6; Cao Wenda4
刊名ASTROPHYSICAL JOURNAL
出版日期2018
卷号852期号:1
关键词Sun: Chromosphere Magnetic Fields Sunspots
DOI10.3847/1538-4357/aa9c47
文献子类Article
英文摘要We present results from the investigation of 5 minute umbral oscillations in a single-polarity sunspot of active region NOAA 12132. The spectra of TiO, H alpha, and 304 angstrom are used for corresponding atmospheric heights from the photosphere to lower corona. Power spectrum analysis at the formation height of H alpha - 0.6 angstrom to the Ha center resulted in the detection of 5 minute oscillation signals in intensity interpreted as running waves outside the umbral center, mostly with vertical magnetic field inclination > 15 degrees. A phase-speed filter is used to extract the running wave signals with speed v(ph) >. 4 km s(-1), from the time series of H alpha - 0.4 angstrom images, and found twenty-four 3 minute umbral oscillatory events in a duration of one hour. Interestingly, the initial emergence of the 3 minute umbral oscillatory events are noticed closer to or at umbral boundaries. These 3 minute umbral oscillatory events are observed for the first time as propagating from a fraction of preceding running penumbral waves (RPWs). These fractional wavefronts rapidly separate from RPWs and move toward the umbral center, wherein they expand radially outwards suggesting the beginning of a new umbral oscillatory event. We found that most of these umbral oscillatory events develop further into RPWs. We speculate that the waveguides of running waves are twisted in spiral structures and hence the wavefronts are first seen at high latitudes of umbral boundaries and later at lower latitudes of the umbral center.
WOS关键词UMBRAL OSCILLATIONS ; PHOTOSPHERIC OSCILLATIONS ; MAGNETOACOUSTIC WAVES ; CHROMOSPHERIC SUNSPOT ; TIME-SERIES ; SOLAR ; VELOCITY ; ASSOCIATION
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000419103300004
资助机构National Basic Research Program of China(11427901 ; National Basic Research Program of China(11427901 ; NJIT ; NJIT ; US NSF(AGS-1250818) ; US NSF(AGS-1250818) ; NASA(NNX13AG14G) ; NASA(NNX13AG14G) ; Korea Astronomy and Space Science Institute ; Korea Astronomy and Space Science Institute ; Seoul National University ; Seoul National University ; strategic priority research program of CAS ; strategic priority research program of CAS ; CAS-TWAS Presidents PhD fellowship ; CAS-TWAS Presidents PhD fellowship ; (2016VMA045) ; (2016VMA045) ; 11773038 ; 11773038 ; 11373040 ; 11373040 ; 11303052 ; 11303052 ; 11303048) ; 11303048) ; National Basic Research Program of China(11427901 ; National Basic Research Program of China(11427901 ; NJIT ; NJIT ; US NSF(AGS-1250818) ; US NSF(AGS-1250818) ; NASA(NNX13AG14G) ; NASA(NNX13AG14G) ; Korea Astronomy and Space Science Institute ; Korea Astronomy and Space Science Institute ; Seoul National University ; Seoul National University ; strategic priority research program of CAS ; strategic priority research program of CAS ; CAS-TWAS Presidents PhD fellowship ; CAS-TWAS Presidents PhD fellowship ; (2016VMA045) ; (2016VMA045) ; 11773038 ; 11773038 ; 11373040 ; 11373040 ; 11303052 ; 11303052 ; 11303048) ; 11303048)
源URL[http://ir.bao.ac.cn/handle/114a11/20339]  
专题国家天文台_太阳物理研究部
作者单位1.Univ Sheffield, Sch Math & Stat, Solar Phys & Space Plasma Res Ctr, Hicks Bldg,Hounsfield Rd,POB 32, Sheffield S3 7RH, S Yorkshire, England
2.Eotvos Lorand Univ, Dept Astron, Pazmany P Setany 1-A, H-1518 Budapest, Hungary
3.Beijing Normal Univ, 19 XinJieKouWai St, Beijing 100875, Peoples R China
4.Big Bear Solar Observ, 40386 North Shore Lane, Big Bear City, CA 92314 USA
5.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
6.Chinese Acad Sci, Key Lab Solar Act, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式
GB/T 7714		 Priya, T. G.,Robert, Erdelyi,Deng Yuanyong,et al. Observations of Running Penumbral Waves Emerging in a Sunspot[J]. ASTROPHYSICAL JOURNAL,2018,852(1).
APA Priya, T. G..,Robert, Erdelyi.,Deng Yuanyong.,Mao Xinjie.,Chen Jie.,...&Cao Wenda.(2018).Observations of Running Penumbral Waves Emerging in a Sunspot.ASTROPHYSICAL JOURNAL,852(1).
MLA Priya, T. G.,et al."Observations of Running Penumbral Waves Emerging in a Sunspot".ASTROPHYSICAL JOURNAL 852.1(2018).

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来源：国家天文台

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