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arXiv 1402.4730astro-ph.SR
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确定性驱动的太阳耀斑雪崩模型

Deterministically Driven Avalanche Models of Solar Flares

Antoine Strugarek, Paul Charbonneau, Richard Joseph, Dorian Pirot

备注：
24 pages, 11 figures, 2 tables, accepted for publication in Solar Physics
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摘要：

我们发展并讨论了一类新的基于格点的太阳耀斑雪崩模型的性质。这些模型很容易服从一个相对明确的物理解释，在缓慢扭转的日冕环。它们与其他雪崩模型有相似之处，例如经典的粘滑自组织地震临界模型，因为它们是由完全确定的能量加载过程在全球范围内驱动的。模型设计导致小规模雪崩的系统性赤字。在模型空间的某些部分中，中型和大型雪崩行为是无标度的，其特征在于事件大小分布具有指数值的幂律形式，在某些参数制度中，与从太阳EUV和X射线耀斑数据推断的那些相比是有利的。对于使用保守或接近保守的再分配规则的模型，也可能出现大量的准周期性雪崩。虽然没有直接对应的耀斑能量释放的观测全球统计数据，后者的行为可能是相关的复发耀斑在个别日冕环。这类模型可以为预测大的太阳耀斑提供依据。

英文摘要：

We develop and discuss the properties of a new class of lattice-based avalanche models of solar flares. These models are readily amenable to a relatively unambiguous physical interpretation in terms of slow twisting of a coronal loop. They share similarities with other avalanche models, such as the classical stick--slip self-organized critical model of earthquakes, in that they are driven globally by a fully deterministic energy loading process. The model design leads to a systematic deficit of small scale avalanches. In some portions of model space, mid-size and large avalanching behavior is scale-free, being characterized by event size distributions that have the form of power-laws with index values, which, in some parameter regimes, compare favorably to those inferred from solar EUV and X-ray flare data. For models using conservative or near-conservative redistribution rules, a population of large, quasiperiodic avalanches can also appear. Although without direct counterparts in the observational global statistics of flare energy release, this latter behavior may be relevant to recurrent flaring in individual coronal loops. This class of models could provide a basis for the prediction of large solar flares.

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