第23周太阳声学高次模频率的变化
Variations of the Solar Acoustic High-Degree Mode Frequencies over Solar Cycle 23
摘要：
利用太阳和日光层天文台（SOHO）航天器上的迈克尔逊多普勒成像仪（MDI）获得的全圆盘观测结果，我们提出了太阳活动周期引起的太阳声学模式频率的变化。在第23太阳活动周的大部分时间里，利用全球日震学分析技术对高阶（100 < l < 900）太阳声模进行了分析。我们遵循Korzennik，Rabello-Soares和Schou（2004）中详细描述的方法来推断高阶模态参数的无偏估计（另见Rabello-Soares，Korzennik和Schou，2006）。我们已经排除了大多数已知的影响高阶模的仪器效应和观测效应。我们发现，高度的变化是在良好的协议与中等程度的结果，除了几年时，仪器高度散焦。分析和讨论了离焦对高阶估计的影响。我们的结果为高次模式证实，频率偏移标度的相对模式惯性是一个函数的频率和它是独立的程度。
英文摘要：
Using full-disk observations obtained with the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory (SOHO) spacecraft, we present variations of the solar acoustic mode frequencies caused by the solar activity cycle. High-degree (100 < l < 900) solar acoustic modes were analyzed using global helioseismology analysis techniques over most of solar cycle 23. We followed the methodology described in details in Korzennik, Rabello-Soares and Schou (2004) to infer unbiased estimates of high-degree mode parameters (see also Rabello-Soares, Korzennik and Schou, 2006). We have removed most of the known instrumental and observational effects that affect specifically high-degree modes. We show that the high-degree changes are in good agreement with the medium-degree results, except for years when the instrument was highly defocused. We analyzed and discuss the effect of defocusing on high degree estimation. Our results for high-degree modes confirm that the frequency shift scaled by the relative mode inertia is a function of frequency and it is independent of degree.
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