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arXiv 1206.6010astro-ph.SR
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没有证据支持耀斑驱动的高频全球振荡

No Evidence Supporting Flare Driven High-Frequency Global Oscillations

M. Richardson, F. Hill, K. G. Stassun

摘要:

在全球低频(< 5.3 mHz)太阳声功率谱中产生激励的基本物理学是归因于太阳对流的众所周知的过程;然而,尚未找到关于是什么导致在高频范围(> 5.3 mHz)中的激励的明确解释。J. 678,73-76,2008)得出结论,在太阳耀斑和全球高频太阳声波之间存在相关性。我们使用了全球振荡网络组(GONG)日震数据,试图验证Karoff和Kjeldsen(2008)的结果,并比较了31次太阳耀斑的耀斑后声功率谱和耀斑前声功率谱。在分析的31个耀斑中,我们观察到太阳耀斑后声功率的减少和增加一样可能。此外,虽然我们确实观察到声功率的变化,最有可能与通常的p-模式与太阳对流,这些变化并没有显示出任何显着的时间关联耀斑。我们没有发现一贯支持耀斑驱动的高频波的证据。

英文摘要:

The underlying physics that generates the excitations in the global low-frequency, < 5.3 mHz, solar acoustic power spectrum is a well known process that is attributed to solar convection; However, a definitive explanation as to what causes excitations in the high-frequency regime, > 5.3 mHz, has yet to be found. Karoff and Kjeldsen (Astrophys. J. 678, 73-76, 2008) concluded that there is a correlation between solar flares and the global high-frequency solar acoustic waves. We have used the Global Oscillations Network Group (GONG) helioseismic data in an attempt to verify Karoff and Kjeldsen (2008) results as well as compare the post-flare acoustic power spectrum to the pre-flare acoustic power spectrum for 31 solar flares. Among the 31 flares analyzed, we observe that a decrease in acoustic power after the solar flare is just as likely as an increase. Furthermore, while we do observe variations in acoustic power that are most likely associated with the usual p-modes associated with solar convection, these variations do not show any significant temporal association with flares. We find no evidence that consistently supports flare driven high-frequency waves.

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