On the observation of traveling acoustic waves in the solar atmosphere using a magneto-optical filter
On the observation of traveling acoustic waves in the solar atmosphere using a magneto-optical filter
复制标题
使用磁光滤波器观测太阳大气中的行波声波
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
S. Jefferies
中科院分区：
文献类型：
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作者：
M. Haberreiter;W. Finsterle;S. Jefferies
与困在太阳空腔中的低频波不同，高频波可以在太阳大气中自由传播。通过对K I 7699 A和Na I 5890 A红翼和蓝翼的观测强度信号建模，我们的目的是更好地理解磁光滤光器在两个高度(MOTH)实验中进行的测量。我们用太阳辐射计算程序(COSI)对观测到的强度信号进行了辐射传递计算。此外，为了分析声波对贡献函数的调制程度，我们还推导出了谱线的形成高度。对于频率高于≈7 MHz的声波，我们发现红蓝滤波之间存在相位滞后，并得出结论，对于更高的频率，需要进行与频率相关的数据分析。(2007 Wiley-VCH Verlag GmbH&Co.KGaA，Weinheim)
In contrast to low-frequency waves that are trapped in the cavity of the Sun, high-frequency waves can travel freely in the solar atmosphere. By modelling the observed intensity signal in the red and blue wings of K I 7699 A and Na I 5890 A, we aim to better understand the measurements carried out with the Magneto-Optical Filter at Two Heights (MOTH) experiment. We model the observed intensity signal with radiative transfer calculations carried out with the COde for Solar Irradiance (COSI). Furthermore, we derive the formation height of the lines in order to analyze to what extent the contribution functions are modulated by the acoustic waves. We find a phase lag between the red and blue filter for acoustic waves with a frequency above ≈7 mHz and conclude that a frequency dependent data analysis is required for higher frequencies. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)