太阳颗粒化的空间不相干性：使用BiSON 2B数据的全球分析
Spatial incoherence of solar granulation: a global analysis using BiSON 2B data
摘要：
对太阳和类太阳恒星外层对流湍流影响的认识不足，对进一步了解其内部结构和动力学提出了挑战。因此，评估和校准这些影响非常重要。在这里，我们研究了太阳中颗粒噪声和振荡模式的空间相干性，目的是利用任何不相干性来击败观察到的颗粒噪声，从而提高低频p模式的检测。使用来自BiSON 2B仪器的数据，我们评估了不同大气高度之间和不同表面区域之间的相干性。我们发现，从不同的大气高度探测颗粒噪声在很大程度上是不相干的振荡占主导地位的频率区域几乎是完全相干的。我们发现一个随机的相位差的颗粒噪声，和一个近零差的倏逝波振荡。的不相干颗粒噪声的减少所示的应用程序的交叉频谱。
英文摘要：
A poor understanding of the impact of convective turbulence in the outer layers of the Sun and Sun-like stars challenges the advance towards an improved understanding of their internal structure and dynamics. Assessing and calibrating these effects is therefore of great importance. Here we study the spatial coherence of granulation noise and oscillation modes in the Sun, with the aim of exploiting any incoherence to beat-down observed granulation noise, hence improving the detection of low-frequency p-modes. Using data from the BiSON 2B instrument, we assess the coherence between different atmospheric heights and between different surface regions. We find that granulation noise from the different atmospheric heights probed is largely incoherent; frequency regions dominated by oscillations are almost fully coherent. We find a randomised phase difference for the granulation noise, and a near zero difference for the evanescent oscillations. A reduction of the incoherent granulation noise is shown by application of the cross-spectrum.
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