HIGH RESOLUTION He I 10830 angstrom NARROW-BAND IMAGING OF AN M-CLASS FLARE. I. ANALYSIS OF SUNSPOT DYNAMICS DURING FLARING

	HIGH RESOLUTION He I 10830 angstrom NARROW-BAND IMAGING OF AN M-CLASS FLARE. I. ANALYSIS OF SUNSPOT DYNAMICS DURING FLARING
	Wang, Ya; Su, Yingna; Hong, Zhenxiang; Zeng, Zhicheng; Ji, Kaifan; Goode, Philip R.; Ca, Wenda; Ji, Haisheng
刊名	ASTROPHYSICAL JOURNAL
	2016
卷号	833 期号:2 页码:250
英文摘要	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.
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/17055]
专题	中国科学院紫金山天文台
推荐引用方式 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):250.
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),250.
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):250.