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 D 2 ) 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 resonan...

中文翻译：

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黑子上方的大气层共振及其潜在的地震学应用。

黑子本影的振荡在光圈和色圈之间显示出显着差异。我们评估了提出的两种相互竞争的方案以解释这些观察结果：色球共振腔和从光层传播到高层大气层的波。我们已经使用数值模拟来分析两个模型中的振荡。已将它们与低色度（Na i D 2）和高色度（He i 10830Å）的观测值进行了比较。谐振腔的节点可以检测为相位跳变或功率骤降，尽管对后者的识别不足以声称存在谐振。相反，速度和温度波动之间的相位差揭示了驻波，并明确证明了本影上方存在声谐振器。