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HIGH RESOLUTION He I 10830 angstrom NARROW-BAND IMAGING OF AN M-CLASS FLARE. I. ANALYSIS OF SUNSPOT DYNAMICS DURING FLARING
Wang, Ya1,2; Su, Yingna1; Hong, Zhenxiang1,2; Zeng, Zhicheng3; Ji KF(季凯帆)4; Goode, Philip R.3; Ca, Wenda3; Ji, Haisheng1,3; Wang, Y
发表期刊ASTROPHYSICAL JOURNAL
2016-12-20
卷号833期号:2
DOI10.3847/1538-4357/833/2/250
产权排序第4完成单位
收录类别SCI
关键词Line: Formation Sunspots Sun: Atmosphere Sun: Flares
摘要In this paper, we report our first-step results of high resolution He I 10830 angstrom narrow-band imaging (bandpass: 0.5 angstrom) of an M1.8 class two-ribbon flare on 2012 July 5. The flare was observed with the 1.6 m aperture New Solar Telescope at Big Bear Solar Observatory. For this unique data set, sunspot dynamics during flaring were analyzed for the first time. By directly imaging the upper chromosphere, running penumbral waves are clearly seen as an outward extension of umbral flashes; both take the form of absorption in the 10830 angstrom narrow-band images. From a space-time image made of a slit cutting across a flare ribbon and the sunspot, we find that the dark lanes for umbral flashes and penumbral waves are obviously broadened after the flare. The most prominent feature is the sudden appearance of an oscillating absorption strip inside the ribbon when it sweeps into the sunspot's penumbral and umbral regions. During each oscillation, outwardly propagating umbral flashes and subsequent penumbral waves rush out into the inwardly sweeping ribbon, followed by a return of the absorption strip with similar speed. We tentatively explain the phenomena as the result of a sudden increase in the density of ortho-helium atoms in the area of the sunspot being excited by the flare's extreme ultraviolet illumination. This explanation is based on the observation that 10830 angstrom absorption around the sunspot area gets enhanced during the flare. Nevertheless, questions are still open and we need further well-devised observations to investigate the behavior of sunspot dynamics during flares.
项目资助者NSFC(11333009, 10428309, 11473071, 11573012) ; One Hundred Talent Program of the Chinese Academy of Sciences ; AFOSR-FA(9550-15-1-0322) ; NJIT ; US NSF(AGS 1250818) ; NASA(NNX13AG14G) ; CAS(XDB09000000) ; Korea Astronomy and Space Science Institute ; Seoul National University
语种英语
学科领域天文学
文章类型Article
ISSN0004-637X
URL查看原文
WOS记录号WOS:000391169600125
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]SOLAR TELESCOPE ; TRANSITION REGION ; HELIUM ; OSCILLATIONS ; SPECTROGRAPH ; CORONA ; LINE ; NM
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/9877
专题抚仙湖太阳观测站
通讯作者Wang, Y
作者单位1.Key Laboratory of DMSA, Purple Mountain Observatory, CAS, Nanjing, 210008, China
2.University of CAS, Beijing 100049, China
3.Big Bear Solar Observatory, 40386 North Shore Lane, Big Bear City, CA 92314, USA
4.Yunnan Astronomical Observatories, Kunming 650011, China
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Wang, Ya,Su, Yingna,Hong, Zhenxiang,et al. HIGH RESOLUTION He I 10830 angstrom NARROW-BAND IMAGING OF AN M-CLASS FLARE. I. ANALYSIS OF SUNSPOT DYNAMICS DURING FLARING[J]. ASTROPHYSICAL JOURNAL,2016,833(2).
APA Wang, Ya.,Su, Yingna.,Hong, Zhenxiang.,Zeng, Zhicheng.,Ji KF.,...&Wang, Y.(2016).HIGH RESOLUTION He I 10830 angstrom NARROW-BAND IMAGING OF AN M-CLASS FLARE. I. ANALYSIS OF SUNSPOT DYNAMICS DURING FLARING.ASTROPHYSICAL JOURNAL,833(2).
MLA Wang, Ya,et al."HIGH RESOLUTION He I 10830 angstrom NARROW-BAND IMAGING OF AN M-CLASS FLARE. I. ANALYSIS OF SUNSPOT DYNAMICS DURING FLARING".ASTROPHYSICAL JOURNAL 833.2(2016).
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