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arXiv 1902.09627astro-ph.SR
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太阳耀斑中准周期脉动的标度律

Scaling laws of quasi-periodic pulsations in solar flares

C. E. Pugh, A. -M. Broomhall, V. M. Nakariakov

摘要:

准周期脉动(QPP)是太阳耀斑的一个共同特征,但以前一直缺乏观测证据来支持任何可能解释QPP起源的理论模型。我们的目的是确定QPP周期与耀斑区域的其他属性之间是否存在任何关系,使用Pugh等人(2017 b)的QPP耀斑样本。如果存在任何关系,那么这些可以与理论QPP机制的标度律进行比较。为了获得燃烧区域的特性,我们使用了AIA 1600和HMI数据。AIA 1600图像可以看到耀斑条带,而HMI磁图可以区分正负磁极性条带并确定磁性。在这项研究中计算的色带性能的色带分离距离,面积,总的无符号磁通量,和平均磁场强度。只包括发生在太阳盘中心\pm 60°范围内的耀斑,这意味着有22个QPP信号的20个耀斑样本。QPP周期与带状物性质呈正相关。最强的相关性与分离距离和磁通量。由于这些带状特征也与耀斑持续时间相关,而QPP周期和耀斑持续时间之间的关系可能受到观测偏差的影响,我们还利用模拟数据来检查是否可以引入人工相关。这些模拟表明,虽然QPP周期和耀斑持续时间的某些组合不能检测到QPP,这并没有引入一个明显的相关性。有证据表明,QPP周期和耀斑带状属性之间的关系,在未来这些属性之间的换算律可以比较理论QPP机制的等效换算律。

英文摘要:

Quasi-periodic pulsations (QPPs) are a common feature of solar flares, but previously there has been a lack of observational evidence to support any of the theoretical models that might explain the origin of QPPs. We aimed to determine if there are any relationships between the QPP period and other properties of the flaring region, using the sample of flares with QPPs from Pugh et al. (2017b). If any relationships exist then these can be compared with scaling laws for the theoretical QPP mechanisms. To obtain the flaring region properties we made use of the AIA 1600 and HMI data. The AIA 1600 images allow the flare ribbons to be seen while the HMI magnetograms allow the positive and negative magnetic polarity ribbons to be distinguished and the magnetic properties determined. The ribbon properties calculated in this study were the ribbon separation distance, area, total unsigned magnetic flux, and average magnetic field strength. Only the flares that occurred within \pm 60° of the solar disk centre were included, which meant a sample of 20 flares with 22 QPP signals. Positive correlations were found between the QPP period and the ribbon properties. The strongest correlations were with the separation distance and magnetic flux. Because these ribbon properties also correlate with the flare duration, and the relationship between the QPP period and flare duration may be influenced by observational bias, we also made use of simulated data to check if artificial correlations could be introduced. These simulations show that although QPPs cannot be detected for certain combinations of QPP period and flare duration, this does not introduce an apparent correlation. There is evidence of relationships between the QPP period and flare ribbon properties, and in the future the derived scaling laws between these properties can be compared to equivalent scaling laws for theoretical QPP mechanisms.

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