在当前扩展极小期期间太阳P模式频率的不寻常趋势
Unusual Trends in Solar P-Mode Frequencies During the Current Extended Minimum
摘要：
我们研究了太阳在当前扩展最小相位期间的中间度模式频率的行为，以探索太阳内部的时变条件。利用GONG和MDI的同期日震数据，我们发现，在活动最小期的共振模式频率的变化显着大于太阳活动的变化，通过不同的代理人测量。我们在2008年7月-8月期间检测到MDI p模式频移的地震最小值，但从GONG频率计算的平均频移中没有看到这样的签名。我们还分析了GONG数据中各个振荡模式的频率随纬度的变化，并观察到2009年初太阳活动周期24的开始。因此，中等程度的模式并不确认2007年晚些时候的周期24的开始，从低程度的GOLF频率的分析报告。此外，与周期22和23之间的最小值期间的行为相比，GONG和MDI频率在当前最小值期间显示出频率和活动代理之间令人惊讶的反相关性。
英文摘要：
We investigate the behavior of the intermediate-degree mode frequencies of the sun during the current extended minimum phase to explore the time-varying conditions in the solar interior. Using contemporaneous helioseismic data from GONG and MDI, we find that the changes in resonant mode frequencies during the activity minimum period are significantly greater than the changes in solar activity as measured by different proxies. We detect a seismic minimum in MDI p-mode frequency shifts during 2008 July--August but no such signature is seen in mean shifts computed from GONG frequencies. We also analyze the frequencies of individual oscillation modes from GONG data as a function of latitude and observe a signature of the onset of the solar cycle 24 in early 2009. Thus the intermediate degree modes do not confirm the onset of the cycle 24 during late 2007 as reported from the analysis of the low-degree GOLF frequencies. Further, both the GONG and MDI frequencies show a surprising anti-correlation between frequencies and activity proxies during the current minimum, in contrast to the behavior during the minimum between cycles 22 and 23.
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