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arXiv 2004.11775astro-ph.SR
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太阳耀斑中GOES X射线准周期脉动的统计研究

Statistical Study of GOES X-ray Quasi-Periodic Pulsations in Solar Flares

Laura A. Hayes, Andrew R. Inglis, Steven Christe, Brian Dennis, Peter T. Gallagher

摘要:

在软X射线辐射中发现的小振幅准周期脉动(QPP)在许多耀斑中都很常见。迄今为止,导致QPP的基础过程尚不清楚。在本文中,我们试图限制流行的\textit{stationary} QPP的最大的统计研究,迄今为止,包括一个研究的关系QPP周期的性质的耀斑活动区,耀斑带,和CME的联系。我们建立在\cite{inglis2016}的工作基础上,并使用模型比较试验来寻找GOES 1- 8 ~ 100通道光变曲线的傅立叶谱中的显著功率。我们分析了过去太阳活动周的所有X、M和C级耀斑,共计5519个耀斑,并在6-300秒时间尺度范围内寻找周期性。大约46%的X级、29%的M级和7%的C级耀斑显示出平稳QPP的证据,其周期服从对数正态分布,峰值出现在20 s。QPP周期与耀斑强度无关,但与耀斑持续时间呈正相关。没有依赖的QPP周期的全球活动区的属性被确定。QPPs与带的无符号磁通量、带面积和带间距呈正相关。我们发现,无论耀斑和没有相关的CME可以主机QPP。此外,我们还证明了对于X级和M级耀斑,衰变相QPP比脉冲相QPP具有统计上更长的周期。

英文摘要:

Small amplitude quasi-periodic pulsations (QPPs) detected in soft X-ray emission are commonplace in many flares. To date, the underpinning processes resulting in the QPPs are unknown. In this paper, we attempt to constrain the prevalence of \textit{stationary} QPPs in the largest statistical study to date, including a study of the relationship of QPP periods to the properties of the flaring active region, flare ribbons, and CME affiliation. We build upon the work of \cite{inglis2016} and use a model comparison test to search for significant power in the Fourier spectra of lightcurves of the GOES 1--8~Å channel. We analyze all X-, M- and C- class flares of the past solar cycle, a total of 5519 flares, and search for periodicity in the 6-300~s timescale range. Approximately 46\% of X-class, 29\% of M-class and 7\% of C-class flares show evidence of stationary QPPs, with periods that follow a log-normal distribution peaked at 20~s. The QPP periods were found to be independent of flare magnitude, however a positive correlation was found between QPP period and flare duration. No dependence of the QPP periods to the global active region properties was identified. A positive correlation was found between QPPs and ribbon properties including unsigned magnetic flux, ribbon area and ribbon separation distance. We found that both flares with and without an associated CME can host QPPs. Furthermore, we demonstrate that for X- and M- class flares, decay phase QPPs have statistically longer periods than impulsive phase QPPs.

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