论文标题
使用傅立叶分析在活动区域出现之前加强太阳F模式
On Strengthening of the Solar f-mode Prior to Active Region Emergence Using the Fourier-Hankel Analysis
论文作者
论文摘要
Singh等人的最新结果。 （2016年）表明，在该地区形成两天前，可以在增强F模式功率的加强中可以看到活跃区域（AR）的出现。在原始工作中，使用环图分析来估计功率演化。在这项研究中，我们利用了傅立叶 - 汉克尔方法，从本质上讲，用独立的方法测试了上述结果。数据是从SDO/HMI中获取的，研究了ARS 11158、11072、11105、11130、11242和11768。研究了随时间的函数研究总功率，我们发现与原始工作相似，这是F-Mode Power的增强，这是AR出现前大约一到三天的F-Mode功率的增强。通过傅立叶分析产生的吸收系数$α$的分析既不表明吸收（$α> 0 $），也不显示增强过程中的发射功率（$α<0 $）。没有发现吸收系数的变化（即$α= 0 $）是重要的结果，因为它缩小了对原始F模式功率增强的物理解释的缩小，这表明没有方向依赖性（从内向和向外移动波的意义上）。
Recent results of Singh et al. (2016) show that the emergence of an active region (AR) can be seen in a strengthening of the f-mode power up to two days prior of the region's formation. In the original work, ring diagram analysis was used to estimate the power evolution. In this study, we make use of the Fourier-Hankel method, essentially testing the aforementioned results with an independent method. The data is acquired from SDO/HMI, studying the ARs 11158, 11072, 11105, 11130, 11242 and 11768. Investigating the total power as a function of time, we find a similar behavior to the original work, which is an enhancement of f-mode power about one to three days prior to AR emergence. Analysis of the absorption coefficient $α$, yielded by a Fourier-Hankel analysis, shows neither absorption ($α> 0$) nor emission ($α< 0$) of power during the enhancement. Finding no changes of the absorption coefficient (i.e. $α= 0$) is an important result, as it narrows down the possible physical interpretation of the original f-mode power enhancement, showing that no directional dependence (in the sense of inward and outward moving waves) is present.
