速度和强度数据中太阳高阶声频和不对称性的比较
Comparison of High-degree Solar Acoustic Frequencies and Asymmetry between Velocity and Intensity Data
摘要：
利用局部日震技术的环形图，我们分析了高次f-和p-模式的频率来自速度和连续强度观测MDI的数据。拟合谱与不对称的峰轮廓，我们发现，与速度线轮廓的不对称性是负的所有频率范围内同意与以前的观察，而强度轮廓的不对称性表现出复杂的和频率相关的行为。我们还观察到系统的频率差异之间的强度和速度谱在高端的频率范围内，主要是4兆赫以上。我们推断，这种差异产生的强度，而不是速度谱的拟合。我们还表明，强度和速度之间的频率差并没有显着变化时，从磁盘中心的肢体的光谱与不对称的配置文件，并得出结论，只有一部分的背景与强度振荡。
英文摘要：
Using the local helioseismic technique of ring diagram we analyze the frequencies of high--degree f- and p-modes derived from both velocity and continuum intensity data observed by MDI. Fitting the spectra with asymmetric peak profiles, we find that the asymmetry associated with velocity line profiles is negative for all frequency ranges agreeing with previous observations while the asymmetry of the intensity profiles shows a complex and frequency dependent behavior. We also observe systematic frequency differences between intensity and velocity spectra at the high end of the frequency range, mostly above 4 mHz. We infer that this difference arises from the fitting of the intensity rather than the velocity spectra. We also show that the frequency differences between intensity and velocity do not vary significantly from the disk center to the limb when the spectra are fitted with the asymmetric profile and conclude that only a part of the background is correlated with the intensity oscillations.
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