运行半影波的性质揭示
The Nature of Running Penumbral Waves Revealed
摘要：
我们试图澄清运行半影（RP）波的性质：它们是色球层的跨太阳黑子波或向上传播的波的视觉模式？利用Milne-Eddington大气反演了光球Si I 10827 λ谱线和色球He I 10830 λ多重谱线的全斯托克斯偏振光谱时间序列。空间像素配对的外本影/内半影光球和半影色球层之间使用反演和双高度配对的视线速度时间序列的倾斜进行了研究，使用傅立叶相位差分析的波传播的签名。辐射冷却声波的色散关系，修改为包括一个倾斜的传播方向，适合以及光球和色球像素对之间的观测相位差。因此，我们已经证明，RP波实际上是低β慢模波沿磁场传播。
英文摘要：
We seek to clarify the nature of running penumbral (RP) waves: are they chromospheric trans-sunspot waves or a visual pattern of upward-propagating waves? Full Stokes spectropolarimetric time series of the photospheric Si I 10827 Åline and the chromospheric He I 10830 Åmultiplet were inverted using a Milne-Eddington atmosphere. Spatial pixels were paired between the outer umbral/inner penumbral photosphere and the penumbral chromosphere using inclinations retrieved by the inversion and the dual-height pairings of line-of-sight velocity time series were studied for signatures of wave propagation using a Fourier phase difference analysis. The dispersion relation for radiatively cooling acoustic waves, modified to incorporate an inclined propagation direction, fits well the observed phase differences between the pairs of photospheric and chromospheric pixels. We have thus demonstrated that RP waves are in effect low-beta slow-mode waves propagating along the magnetic field.
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