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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, Kaifan4; Goode, Philip R.3; Ca, Wenda3; Ji, Haisheng1,3
2016-12-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume833Issue:2Pages:8
Corresponding AuthorWang, Ya()
AbstractIn 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.
Keywordline: formation sunspots Sun: atmosphere Sun: flares
DOI10.3847/1538-4357/833/2/250
WOS KeywordSOLAR TELESCOPE ; TRANSITION REGION ; HELIUM ; OSCILLATIONS ; SPECTROGRAPH ; CORONA ; LINE ; NM
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000391169600125
PublisherIOP PUBLISHING LTD
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23361
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Ya
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab DMSA, Nanjing 210008, Jiangsu, Peoples R China
2.Univ CAS, Beijing 100049, Peoples R China
3.Big Bear Solar Observ, 40386 North Shore Lane, Big Bear City, CA 92314 USA
4.Yunnan Astron Observ, Kunming 650011, Peoples R China
Recommended Citation
GB/T 7714
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):8.
APA Wang, Ya.,Su, Yingna.,Hong, Zhenxiang.,Zeng, Zhicheng.,Ji, Kaifan.,...&Ji, Haisheng.(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),8.
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):8.
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