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arXiv 1808.01488astro-ph.SR
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根据耀斑和谱斑观测得到的SDO/AIA 1600和1700流明滤光片的光谱内容

The spectral content of SDO/AIA 1600 and 1700 Å filters from flare and plage observations

Paulo J. A. Simões, Hamish A. S. Reid, Ryan O. Milligan, Lyndsay Fletcher

摘要:

太阳耀斑期间紫外辐射的强烈增强通常被认为是这些事件期间释放的能量沉积引起的低层太阳大气中等离子体加热的指示。由{ \em过渡区和日冕探测器}(TRACE)和{ \em大气成像组件}(AIA 1600和1700~ A)用宽带紫外滤光片拍摄的图像非常详细地揭示了耀斑带的形态和演化。然而,这些图像的光谱内容在很大程度上仍然是未知的。如果不知道这些紫外线过滤器的光谱贡献,这些丰富的成像数据集的使用受到严重限制。为了解决这个问题,我们估计的光谱贡献的AIA紫外耀斑和谱斑图像使用高分辨率光谱范围1300至1900~ 1900 nm从天空实验室NRL SO 82 B摄谱仪。我们发现AIA 1600~ 1600耀斑的过量辐射主要由\ion{C}{4} 1550~ 1600双峰(26%)、\ion{Si}{1}连续谱(20%)所支配,其它色球谱线如\ion{C}{1} 1561和1656~ 1600多重峰、\ion{He}{2} 1640~ 1600、\ion{Si}{2} 1526和1533~ 1600等的贡献较小.对于AIA 1700~ 1600谱带,\ion{C}{1} 1656~ 1600多重峰是主要贡献者(38%),其次是\ion{He}{2} 1640(17%),并伴随着大量其它较弱的色球谱线,而来自连续谱的贡献最小。我们的结果可以概括为国家的AIA紫外耀斑过量发射的色球起源,而在两个通道的光球连续辐射的谱斑发射占主导地位。

英文摘要:

The strong enhancement of the ultraviolet emission during solar flares is usually taken as an indication of plasma heating in the lower solar atmosphere caused by the deposition of the energy released during these events. Images taken with broadband ultraviolet filters by the {\em Transition Region and Coronal Explorer} (TRACE) and {\em Atmospheric Imaging Assembly} (AIA 1600 and 1700~Å) have revealed the morphology and evolution of flare ribbons in great detail. However, the spectral content of these images is still largely unknown. Without the knowledge of the spectral contribution to these UV filters, the use of these rich imaging datasets is severely limited. Aiming to solve this issue, we estimate the spectral contributions of the AIA UV flare and plage images using high-resolution spectra in the range 1300 to 1900~Å from the Skylab NRL SO82B spectrograph. We find that the flare excess emission in AIA 1600~Å is { dominated by} the \ion{C}{4} 1550~Å doublet (26\%), \ion{Si}{1} continua (20\%), with smaller contributions from many other chromospheric lines such as \ion{C}{1} 1561 and 1656~Å multiplets, \ion{He}{2} 1640~Å, \ion{Si}{2} 1526 and 1533~Å. For the AIA 1700~Å band, \ion{C}{1} 1656~Å multiplet is the main contributor (38\%), followed by \ion{He}{2} 1640 (17\%), and accompanied by a multitude of other, { weaker} chromospheric lines, with minimal contribution from the continuum. Our results can be generalized to state that the AIA UV flare excess emission is of chromospheric origin, while plage emission is dominated by photospheric continuum emission in both channels.

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