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首页> 外文期刊>EPJ Web of Conferences >On the relation between activity-related frequency shifts and the sunspot distribution over the solar cycle 23
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On the relation between activity-related frequency shifts and the sunspot distribution over the solar cycle 23

机译：关于活动相关的频移与太阳周期中太阳黑子分布之间的关系23

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The activity-related variations in the solar acoustic frequencies have been known for 30 years. However, the importance of the different contributions is still not well established. With this in mind, we developed an empirical model to estimate the spot-induced frequency shifts, which takes into account the sunspot properties, such as area and latitude. The comparison between the model frequency shifts obtained from the daily sunspot records and those observed suggests that the contribution from a stochastic component to the total frequency shifts is about 30%. The remaining 70% is related to a global, long-term variation. We also propose a new observable to investigate the short-and mid-term variations of the frequency shifts, which is insensitive to the long-term variations contained in the data. On the shortest time scales the variations in the frequency shifts are strongly correlated with the variations in the total area covered by sunspots. However, a significant loss of correlation is still found, which cannot be fully explained by ignoring the invisible side of the Sun when accounting for the total sunspot area. We also verify that the times when the frequency shifts and the sunspot areas do not vary in a similar way tend to coincide with the times of the maximum amplitude of the quasi-biennial variations found in the seismic data.
机译：太阳声频率中与活动有关的变化已经有30年了。然而，仍然没有很好地确定不同贡献的重要性。考虑到这一点，我们开发了一个经验模型来估计点引起的频移，该模型考虑了太阳黑子的属性，例如面积和纬度。从日常黑子记录获得的模型频移与观察到的频移之间的比较表明，随机成分对总频移的贡献约为30％。其余70％与全球长期变化有关。我们还提出了一个新的观测值，以研究频​​移的短期和中期变化，该变化对数据中包含的长期变化不敏感。在最短的时间尺度上，频移的变化与黑子覆盖的总面积的变化密切相关。但是，仍然发现显着的相关性损失，在考虑太阳黑子的总面积时，不能通过忽略太阳的不可见面来完全解释。我们还验证了频移和黑子区域没有以类似方式变化的时间往往与地震数据中发现的准两年期变化的最大幅度的时间一致。

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