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arXiv 0704.0617astro-ph
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宁静太阳中Ca II 8498 A和8542 A谱线的分光偏振观测

Spectropolarimetric observations of the Ca II 8498 A and 8542 A lines in the quiet Sun

A. Pietarila, H. Socas-Navarro, T. Bogdan

摘要:

Ca II红外线三重线是可用于地面观测的少数几条磁敏感色球线之一。我们提出的光谱偏振观测的8498 A和8542 A线在一个安静的太阳区域附近的一个衰减的活动区域,并比较结果与模拟的线在高等离子体β制度。对斯托克斯V型剖面对的聚类分析表明,这两条线尽管可以说是相当接近地形成的,但往往没有相似的形状。在网络中,局部磁拓扑在确定斯托克斯V轮廓的形状方面比波的相位更重要,与我们的模拟结果相反。我们还发现,斯托克斯V型不对称性是非常普遍的网络中,观察到的幅度和面积不对称性的直方图与模拟显着不同。网络和互联网络都表现出振荡行为的Ca II线。它在网络中更强,在那里可以看到类似于高β模拟中的冲击波,并且强度分布中的大的自反转是常见的。

英文摘要:

The Ca II infrared triplet is one of the few magnetically sensitive chromospheric lines available for ground-based observations. We present spectropolarimetric observations of the 8498 A and 8542 A lines in a quiet Sun region near a decaying active region and compare the results with a simulation of the lines in a high plasma-beta regime. Cluster analysis of Stokes V profile pairs shows that the two lines, despite arguably being formed fairly close, often do not have similar shapes. In the network, the local magnetic topology is more important in determining the shapes of the Stokes V profiles than the phase of the wave, contrary to what our simulations show. We also find that Stokes V asymmetries are very common in the network, and the histograms of the observed amplitude and area asymmetries differ significantly from the simulation. Both the network and internetwork show oscillatory behavior in the Ca II lines. It is stronger in the network, where shocking waves, similar to those in the high-beta simulation, are seen and large self-reversals in the intensity profiles are common.

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