FIRST HIGH-RESOLUTION SPECTROSCOPIC OBSERVATIONS OF AN ERUPTING PROMINENCE WITHIN A CORONAL MASS EJECTION BY THE INTERFACE REGION IMAGING SPECTROGRAPH (IRIS)
FIRST HIGH-RESOLUTION SPECTROSCOPIC OBSERVATIONS OF AN ERUPTING PROMINENCE WITHIN A CORONAL MASS EJECTION BY THE INTERFACE REGION IMAGING SPECTROGRAPH (IRIS)
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DOI：
10.1088/0004-637x/803/2/85
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
Wei Liu;B. Pontieu;J. Vial;A. Title;M. Carlsson;H. Uitenbroek;T. Okamoto;T. Berger;P. Antolin
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文献类型：
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作者：
Wei Liu;B. Pontieu;J. Vial;A. Title;M. Carlsson;H. Uitenbroek;T. Okamoto;T. Berger;P. Antolin
光谱观测日珥爆发与日冕物质抛射（CME），虽然相对罕见，可以提供有价值的等离子体和三维几何诊断。我们报告了2014年5月9日界面区域成像光谱仪使命对一次壮观的快速CME/日珥爆发的首次观测，该爆发与一次相当于X1.6的耀斑有关。喷发的最大天平面速度和多普勒速度分别为1200 km s − 1和460 km s−1。在多普勒速度上，有两个喷发分量相隔约200 km s−1：一个明亮的主分量和一个微弱的次分量，表明物质呈中空而非实心的锥形分布。喷发涉及一个左旋螺旋结构，它经历逆时针（自上而下）的解旋运动。有一个时间的演变，从向上喷发到向下回落小于自由落体的速度和减少非热谱线宽度。我们发现了一个广泛的Mg II K/H线强度比（小于1.02预期的光学薄的热发射）：有史以来最低的中位值1.17发现的回落材料，一个高的值1.63附近的日冕雨，和中间值1.53和1.41的两个喷发组件。回退材料表现出强（> 5）？> k/h比值与多普勒速度和谱线强度呈线性相关。我们证明，多普勒调光散射色球发射的喷发物质可以潜在地解释这样的特点。
Spectroscopic observations of prominence eruptions associated with coronal mass ejections (CMEs), although relatively rare, can provide valuable plasma and three-dimensional geometry diagnostics. We report the first observations by the Interface Region Imaging Spectrograph mission of a spectacular fast CME/prominence eruption associated with an equivalent X1.6 flare on 2014 May 9. The maximum plane-of-sky and Doppler velocities of the eruption are 1200 and 460 km s−1, respectively. There are two eruption components separated by ∼200 km s−1 in Doppler velocity: a primary, bright component and a secondary, faint component, suggesting a hollow, rather than solid, cone-shaped distribution of material. The eruption involves a left-handed helical structure undergoing counterclockwise (viewed top-down) unwinding motion. There is a temporal evolution from upward eruption to downward fallback with less-than-free-fall speeds and decreasing nonthermal line widths. We find a wide range of Mg ii k/h line intensity ratios (less than ∼2 expected for optically-thin thermal emission): the lowest ever reported median value of 1.17 found in the fallback material, a comparably high value of 1.63 in nearby coronal rain, and intermediate values of 1.53 and 1.41 in the two eruption components. The fallback material exhibits a strong ( > 5 ) ?> linear correlation between the k/h ratio and the Doppler velocity as well as the line intensity. We demonstrate that Doppler dimming of scattered chromospheric emission by the erupted material can potentially explain such characteristics.