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arXiv 2004.07687astro-ph.SR
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高分辨率观测中本影点的物理特征

Physical Characteristics of Umbral Dots Derived from a High Resolution Observation

Ali Kilcik, Volkan Sarp, Vasyl Yurchyshyn, Jean-Pierre Rozelot, Atila Özgüc

摘要:

本研究的目的是利用最新的高分辨率观测资料重新研究本影点的物理参数,为科学认识其形成和演化做出贡献。在这项研究中,我们应用了一种粒子跟踪算法来检测2015年6月14日由古德太阳望远镜(GST)观测到的NOAA AR 12384中的UD。我们分析了平均位置分布,位置依赖性,和检测到的总2892 UD的一般属性分别在其生命周期和周期性行为,只有选定的10个长寿的UD。我们发现,i)最亮、最大、最快和最椭圆的UD倾向于位于本影-半影边界处,而它们的寿命不显示任何有意义的位置依赖性,ii)所有检测到的UD的平均动态速度约为(0.76 km/s),iii)从寿命最长的354个UD获得的轨迹显示它们通常具有向内运动,iv)选择的10个长寿命UD通常具有相似的周期性行为,显示8.5-32、3.5-4.1、1.5-1.9和1.1-1.3分钟的周期性,v)通常,检测到的UD具有椭圆形状,平均偏心率为0.29,标准偏差为0.11,vi)较大的UD往往更椭圆且更动态。

英文摘要:

The aim of this study is revisit the physical parameters of umbral dots (UDs) with the latest high resolution observations and contribute to the scientific understanding of their formation and evolution. In this study, we applied a particle tracking algorithm for detecting UDs in NOAA AR12384 observed on June 14, 2015 by the Goode Solar Telescope (GST). We analyzed average position distributions, location dependencies, and general properties of detected total 2892 UDs separately during their life time and the periodic behavior of only selected 10 long living UDs. We found; i) brightest, largest, fastest and most elliptic UDs tend to be located at the umbra-penumbra boundary while their lifetime does not display any meaningful location dependency, ii) average dynamic velocity of all detected UDs is about twice (0.76 km/s) of the previously reported average values, iii) obtained trajectories from the longest living 354 UDs show that they have generally inward motion, iv) chosen 10 long living UDs generally have similar periodic behavior showing 8.5-32, 3.5-4.1, 1.5-1.9, and 1.1-1.3 minutes periodicities, v) generally, detected UDs have an elliptical shape with the averaged eccentricity of 0.29, with a 0.11 standard deviation, vi) larger UDs tend to be more elliptic and more dynamic.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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