Si ii1206 Å线耀斑诱导多普勒频移的观测

IF 2.4 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Luke H. Majury, Ryan O. Milligan
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引用次数: 0

摘要

在太阳耀斑期间色球和过渡区线的多普勒频移常被解释为色球凝结或蒸发。然而,已经提出了多普勒移发射的其他来源,如长丝喷发、喷流或色球泡。我们分析了来自SORCE/SOLSTICE的高节奏扫描,它提供了过渡区Si iii (1206 Å, \(\textrm{T} = 10^{4.6}\,\textrm{K}\))线的一分钟分辨率剖面。在这些扫描中观察到11个X级、M级和c级事件,并确定了明显的脉冲相Si iii增强。通过减去安静太阳剖面和拟合高斯剖面到Si iii线,测量了耀斑引起的多普勒频移。在校正了这些随太阳经度变化的系统趋势后,发现11个事件中有两个表现出显著的多普勒频移,一个是\(201.36\pm 21.94\;\textrm{km\,s}^{-1}\)红移,另一个是\(-39.75\pm 11.00\;\textrm{km\,s}^{-1}\)蓝移。有趣的是,SDO/AIA 304 Å和1600 Å的成像显示明亮的喷发与蓝移同时发生,这表明蓝移可能是由喷发而不是蒸发引起的。我们的结果强调Si iii作为一种有用的诊断在温度下的燃烧动力学,迄今为止受到有限的关注。未来将这些观测结果与辐射流体动力学模拟进行比较,以及来自最先进的光谱仪(如SOLAR-C/EUVST和MUSE)的新观测结果,将阐明本研究中观测到的变化背后的机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observations of Flare Induced Doppler Shifts in the Si iii 1206 Å Line

Doppler shifts in chromospheric and transition-region lines during solar flares are often interpreted as chromospheric condensation or evaporation. However, alternative sources of Doppler-shifted emission have been suggested, such as filament eruptions, jets or chromospheric bubbles. We analyse high-cadence scans from SORCE/SOLSTICE, which provide one-minute resolution profiles of the transition-region Si iii (1206 Å, \(\textrm{T} = 10^{4.6}\,\textrm{K}\)) line. 11 X-, M-, and C-class events observed during these scans with clear impulsive phase Si iii enhancements were identified. By subtracting a quiet-Sun profile and fitting Gaussian profiles to the Si iii line, measurements of flare-induced Doppler shifts were made. After correcting for a systematic trend in these shifts with solar longitude, two of the 11 events were found to exhibit a significant Doppler shift, one with a \(201.36\pm 21.94\;\textrm{km\,s}^{-1}\) redshift and the other with a \(-39.75\pm 11.00\;\textrm{km\,s}^{-1}\) blueshift. Intriguingly, SDO/AIA 304 Å and 1600 Å imaging revealed a bright eruption coincident with the event that exhibited a blueshift, suggesting the shift may have resulted from the eruption rather than evaporation alone. Our results highlight Si iii as a useful diagnostic of flaring dynamics at a temperature that has received limited attention to date. Future comparisons of these observations with radiative hydrodynamic simulations, along with new observations from state-of-the-art spectrometers such as SOLAR-C/EUVST and MUSE, should clarify the mechanisms behind the observed shifts in this study.

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来源期刊
Solar Physics
Solar Physics 地学天文-天文与天体物理
CiteScore
5.10
自引率
17.90%
发文量
146
审稿时长
1 months
期刊介绍: Solar Physics was founded in 1967 and is the principal journal for the publication of the results of fundamental research on the Sun. The journal treats all aspects of solar physics, ranging from the internal structure of the Sun and its evolution to the outer corona and solar wind in interplanetary space. Papers on solar-terrestrial physics and on stellar research are also published when their results have a direct bearing on our understanding of the Sun.
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