太阳大气中声学截止周期随高度的变化：理论与观测
Variation of acoustic cutoff period with height in the solar atmosphere: theory versus observations
摘要：
最近，Wijniewska等人用观测方法证明了在太阳大气层（包括光球层上部和色球层下部和中部）中声波截止频率随高度的变化，并指出现有的声波截止理论公式不能解释观测结果。为了再现观测到的截止值随大气高度的变化，对太阳大气中脉冲产生的声波进行了数值模拟，并利用时间波剖面的谱分析数值计算了声波截止值随高度的变化。数值计算结果与观测数据的比较表明，两者吻合较好，这清楚地表明，所得结果可用于确定背景太阳大气的结构。
英文摘要：
Recently Wiśniewska et al. demonstrated observationally how the acoustic cutoff frequency varies with height in the solar atmosphere including the upper photosphere and the lower and middle chromosphere, and showed that the observational results cannot be accounted for by the existing theoretical formulas for the acoustic cutoff. In order to reproduce the observed variation of the cutoff with atmospheric height, numerical simulations of impulsively generated acoustic waves in the solar atmosphere are performed, and the spectral analysis of temporal wave profiles is used to compute numerically changes of the acoustic cutoff with height. Comparison of the numerical results with the observational data shows good agreement, which clearly indicates that the obtained results may be used to determine the structure of the background solar atmosphere.
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