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arXiv 0909.2224astro-ph.SR
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光球和色球谱线的线性波长相关矩阵:1。观察与建模

Linear wavelength correlation matrices of photospheric and chromospheric spectral lines: 1. Observations vs. modeling

C. Beck, W. Rammacher

摘要:

本文研究了光球和色球谱线中不同波长的强度之间的线性相关系数。垂直传播通过分层太阳大气的波在不同的时间影响不同的波长。这导致在各种波长处强度的(非)相干性的特征图案。我们从观测资料中导出了几条光球和色球谱线的相关矩阵。为了与观测结果进行比较,我们从LTE建模方法,1-D NLTE模拟和3-D MHD模拟运行计算光谱的相关矩阵。我们也适用于相关方法在不同的光学深度层的温度图。我们发现所有的光球谱线都表现出相似的模式:谱线核心与红翼或蓝翼之间的相关具有明显的不对称性。这种模式不能通过模拟颗粒模式来复制,而是通过向上传播的波来复制。所有的色球层谱线都显示出一种更为复杂的模式。在Ca II H的情况下,单色波的1-D NLTE模拟产生与观测定性匹配的相关矩阵。光球的签名是很好地再现矩阵来自3-D MHD模拟。观测到的光球和色球谱线的相关矩阵是高度结构化的,每条谱线的相关矩阵具有特征性和不同的模式。与从模拟和简单建模得到的矩阵的比较表明,检测到的图案的主要驱动力是向上传播的波。应用相关方法的3-D温度立方体似乎是一个很有前途的工具,在未来的研究中,模拟结果和观测的详细比较。

英文摘要:

We investigate the linear correlation coefficient between the intensities at different wavelengths in photospheric and chromospheric spectral lines. Waves that propagate vertically through the stratified solar atmosphere affect different wavelengths at different times. This leads to a characteristic pattern of (non-)coherence of the intensity at various wavelengths. We derived the correlation matrices for several photospheric and chromospheric spectral lines from observations. For comparison with the observations, we calculate correlation matrices for spectra from LTE modeling approaches, 1-D NLTE simulations, and a 3-D MHD simulation run. We apply the correlation method also to temperature maps at different optical depth layers. We find that all photospheric spectral lines show a similar pattern: a pronounced asymmetry of the correlation between line core and red or blue wing. The pattern cannot be reproduced with a simulation of the granulation pattern, but with waves that travel upwards. All chromospheric spectral lines show a more complex pattern. In the case of Ca II H, the 1-D NLTE simulations of monochromatic waves produce a correlation matrix that qualitatively matches to the observations. The photospheric signature is well reproduced in the matrix derived from the 3-D MHD simulation. The correlation matrices of observed photospheric and chromospheric spectral lines are highly structured with characteristic and different patterns in every spectral line. The comparison with matrices derived from simulations and simple modeling suggests that the main driver of the detected patterns are upwards propagating waves. Application of the correlation method to 3-D temperature cubes seems to be a promising tool for a detailed comparison of simulation results and observations in future studies.

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