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Statistical Properties of Magnetic Activity in the Solar Corona

机译:日冕中磁活动的统计性质

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The long-time statistical behavior of a two-dimensional section of a coronal loop subject to random magnetic forcing is presented. The highly intermittent nature of dissipation is revealed by means of magnetohydrodynamic (MHD) turbulence numerical simulations. Even with a moderate magnetic Reynolds number, intermittency is clearly present in both space and time. The response of the loop to the random forcing, as described either by the time series of the average and maximum energy dissipation or by its spatial distribution at a given time, displays a Gaussian noise component that may be subtracted to define discrete dissipative events. Distribution functions of both maximum and average current dissipation, for the total energy content, the peak activity, and the duration of such events are all shown to display robust scaling laws, with scaling indices δ that vary from δ -1.3 to δ -2.8 for the temporal distribution functions, while δ -2.6 for the overall spatial distribution of dissipative events.
机译:提出了一个随机受力的冠环二维截面的长期统计行为。磁流体动力学(MHD)湍流数值模拟揭示了耗散的高度间歇性。即使具有适中的雷诺数,在空间和时间上也显然存在间歇性。环路对随机强迫的响应(如通过平均和最大能量耗散的时间序列或其在给定时间的空间分布所描述)显示了高斯噪声分量,可以将其减去以定义离散的耗散事件。对于总能量含量,峰值活动和此类事件的持续时间,最大和平均电流耗散的分布函数均显示出鲁棒的缩放定律,缩放指数δ在δ-1.3到δ-2.8之间变化。时间分布函数,而δ-2.6用于耗散事件的整体空间分布。

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