Observations of Running Penumbral Waves Emerging in a Sunspot

doi:10.3847/1538-4357/aa9c47

	Observations of Running Penumbral Waves Emerging in a Sunspot
	Priya, T. G.5,6; Robert, Erdelyi 1,2; Deng Yuanyong5,6 ; Mao Xinjie 3,6; Chen Jie6 ; Su Jiangtao5,6 ; Cao Wenda 4
刊名	ASTROPHYSICAL JOURNAL
	2018
卷号	852 期号:1
关键词	Sun: Chromosphere Magnetic Fields Sunspots
DOI	10.3847/1538-4357/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)
内容类型	期刊论文
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).