继承自光球下快体模式的本影振荡模型
A model of umbral oscillations inherited from subphotospheric fast-body modes
AI总结：
针对本影振荡水平模式的起源问题，提出其继承自光球下快体模式的解析模型，成功再现振荡模式的时间演化，并发现其依赖振荡周期且存在独特的截止径向模式。
摘要：
近期，复杂的本影振荡水平模式已被报道，但其物理本质和起源仍未被完全理解。在此，我们表明慢波的本影振荡二维模式继承自光球下快体模式。使用简单的解析模型，我们成功利用有限数量的快体模式再现了振荡模式的时间演化。在该模型中，模式的径向视传播与径向模式中振幅的适当组合相关。我们还发现振荡模式依赖于振荡周期。该结果表明存在一个截止径向模式，这是快体模式模型的独特特征。原则上，内部和外部源都能激发这些快体模式并产生本影振荡的水平模式。
英文摘要：
Recently, complex horizontal patterns of umbral oscillations have been reported, but their physical nature and origin are still not fully understood. Here we show that the two-dimensional patterns of umbral oscillations of slow waves are inherited from the subphotospheric fast-body modes. Using a simple analytic model, we successfully reproduced the temporal evolution of oscillation patterns with a finite number of fast-body modes. In this model, the radial apparent propagation of the pattern is associated with the appropriate combination of the amplitudes in radial modes. We also find that the oscillation patterns are dependent on the oscillation period. This result indicates that there is a cutoff radial mode, which is a unique characteristic of the model of fast-body modes. In principle, both internal and external sources can excite these fast-body modes and produce horizontal patterns of umbral oscillations.
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