论文标题
细胞自动机雪崩模型是否模拟太阳耀斑的准周期脉动？
Do Cellular Automaton Avalanche Models Simulate the Quasi-Periodic Pulsations of Solar Flares?
论文作者
论文摘要
在太阳耀斑排放中反复检测到具有各个时期的准周期搏动（QPP）。我们应用2D细胞自动机（CA）雪崩模型来模拟QPP，这是由于重复的负载/卸载机制而导致的。我们表明，在耀斑环中频繁出现磁重复连接可能会在检测到的排放中诱导准周期模式。我们获得了21070个模拟的耀斑中，有813个事件在50秒内持久，并以Yohkoh Hard X射线望远镜的时间分辨率缩放，其中约有70％的持久事件显示出QPPS。我们还说明，应用的CA模型为QPP提供了广泛的周期性。此外，我们观察到近50％的使用Lomb-Scargle期间图的病例中存在多个时期。对数正态分布拟合到周期的单峰分布，这是基本乘法机制的表现，该机制代表了系统独立变化参数的影响。周期的对数正态分布的全局最大分布位于29.29秒。我们将模拟QPPS的统计数据与宿主耀斑的参数进行比较，并讨论耀斑特性对QPPS期间的影响。考虑到CA模型的内在特征，即重复载荷/卸载机制以及获得的证据，我们建议CA模型可能会产生QPP。我们还检查了自回归整合运动平均模型的适用性，以描述模拟和观察QPP。
Quasi-periodic pulsations (QPPs) with various periods that originate in the underlying magnetohydrodynamic processes of the flaring structures are detected repeatedly in the solar flare emissions. We apply a 2D cellular automaton (CA) avalanche model to simulate QPPs as a result of a repetitive load/unload mechanism. We show that the frequent occurrence of magnetic reconnections in a flaring loop could induce quasi-periodic patterns in the detected emissions. We obtain that among 21070 simulated flares, 813 events endure over 50 seconds, scaled with the temporal resolution of the Yohkoh Hard X-ray Telescope, and about 70 percent of these rather long-lasting events exhibit QPPs. We also illustrate that the applied CA model provides a wide range of periodicities for QPPs. Furthermore, we observe the presence of multiple periods in nearly 50 percent of the cases applying the Lomb-Scargle periodogram. A lognormal distribution is fitted to the unimodal distribution of the periods as a manifestation of an underlying multiplicative mechanism that typifies the effect of the system's independent varying parameters. The global maximum of the periods' lognormal distribution is located at 29.29 seconds. We compare statistics of the simulated QPPs with parameters of the host flares and discuss the impacts of flare properties on QPPs' periods. Considering the intrinsic characteristic of CA models, namely the repetitive load/unload mechanism, and the obtained pieces of evidence, we suggest that CA models may generate QPPs. We also examine the applicability of the autoregressive integrated moving average models to describe the simulated and observational QPPs.
