论文标题
在黑子上方和潜在的地震学应用上方的色球环共振
Chromospheric resonances above sunspots and potential seismological applications
论文作者
论文摘要
黑子伞的振荡在光球和色球之间表现出显着的差异。我们评估了提出的两个用于解释这些观察结果的竞争场景：色球谐振腔和从光球到上层大气层传播的波浪。我们已经使用数值模拟来分析这两个模型中的振荡。它们已与低（Na I D2）和高（He I10830Å）色球层的观察结果进行了比较。尽管后者的识别不足以声称存在共振的存在，但可以检测到谐振腔的节点。相比之下，速度和温度波动之间的相位差异揭示了站立波，并且明确证明了在umbrae上方存在声学谐振器。我们的发现提供了一种新的地震方法，可通过检测共振节点来探测活性区域色球。
Oscillations in sunspot umbrae exhibit remarkable differences between the photosphere and chromosphere. We evaluate two competing scenarios proposed for explaining those observations: a chromospheric resonant cavity and waves traveling from the photosphere to upper atmospheric layers. We have employed numerical simulations to analyze the oscillations in both models. They have been compared with observations in the low (Na I D2) and high (He I 10830 Å) chromosphere. The nodes of the resonant cavity can be detected as phase jumps or power dips, although the identification of the latter is not sufficient to claim the existence of resonances. In contrast, phase differences between velocity and temperature fluctuations reveal standing waves and unequivocally prove the presence of an acoustic resonator above umbrae. Our findings offer a new seismic method to probe active region chromospheres through the detection of resonant nodes.
