最近的扩展极小值是多么奇怪--对双重极小值的暗示
How peculiar was the recent extended minimum - A hint towards double minima
摘要：
在本文中，我们解决的争议，最近延长太阳能最低日震低，中度模式频率：从不同的仪器研究确定不同时期的地震极小。在这里，我们使用的模式频率从一个网络的六个相同的仪器，全球振荡网络组，连续收集数据超过15年，调查的时代，太阳振荡频率的最低开始之前的太阳周期24。我们包括在0 - 120的$\ell$范围和2.0 - 3.5 mHz的频率范围内的低度和中度模式。在这个分析中，我们证明了振荡频率确实有两个最小值，这取决于模式的程度，或者更准确地说，传播波的较低的转折点半径。我们还分析了频率作为纬度的函数，以确定太阳活动周期24的开始。我们在高纬度地区观察到两个极小值，在中/低纬度地区观察到一个极小值。这种情况与第23个周期相反，在第23个周期中，地震最小值的时期不随纬度或深度而变化。我们的研究结果还暗示了遗迹磁场在修改更深层采样模式的振荡频率方面可能发挥的作用。
英文摘要：
In this paper, we address the controversy regarding the recent extended solar minimum as seen in helioseismic low- and intermediate-degree mode frequencies: studies from different instruments identify different epochs of seismic minima. Here we use mode frequencies from a network of six identical instruments, Global Oscillation Network Group, continuously collecting data for more than 15 years, to investigate the epoch of minimum in solar oscillation frequencies prior to the beginning of solar cycle 24. We include both low- and intermediate-degree modes in the $\ell$ range of 0 -- 120 and frequency range of 2.0 -- 3.5 mHz. In this analysis, we demonstrate that there were indeed two minima in oscillation frequencies, depending upon the degree of modes, or more precisely the lower turning point radius of the propagating wave. We also analyze frequencies as a function of latitude to identify the beginning of solar cycle 24. We observe two minima at high latitudes and a single minimum at mid/low latitudes. This scenario is in contrast to cycle 23 where the epoch of seismic minimum did not change with latitude or depth. Our results also hint towards a possible role of the relic magnetic field in modifying the oscillation frequencies of modes sampling deeper layers.
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