SMALL-SCALE HEATING EVENTS IN THE SOLAR ATMOSPHERE. I. IDENTIFICATION, SELECTION, AND IMPLICATIONS FOR CORONAL HEATING
SMALL-SCALE HEATING EVENTS IN THE SOLAR ATMOSPHERE. I. IDENTIFICATION, SELECTION, AND IMPLICATIONS FOR CORONAL HEATING
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太阳大气中的小规模加热事件。
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
W. Schmutz
中科院分区：
文献类型：
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作者：
N. Guerreiro;M. Haberreiter;V. Hansteen;W. Schmutz
我们提出了一种综合方法，可以在安静太阳条件下的 3D 磁流体动力学模拟中详细分析小规模加热事件。该方法确定了模拟中不同时刻小规模加热事件的数量、体积和一些一般几何特性，体积为 16 × 8 × 16 Mm3，范围从对流区顶部到日冕。我们发现，在模拟面积 128 Mm2 以上的任何时刻，大约有 104 次小规模加热事件。它们主要出现在 1.5 至 3.0 毫米之间的高度。我们确定了它们预测的垂直范围的平均值，随着时间的推移，范围从 375 公里到 519 公里，并且我们表明，任何时刻事件的高度、体积和能量分布都类似于幂律。最后，我们证明较大的加热结构是更小的加热事件的组合，并且小规模的加热事件消耗足够的能量以在任何时刻维持日冕能量平衡。
We present a comprehensive method to analyze small-scale heating events in detail in a 3D magnetohydrodynamics simulation for quiet-Sun conditions. The method determines the number, volume, and some general geometric properties of the small-scale heating events at different instants in a simulation with a volume of 16 × 8 × 16 Mm3, spanning from the top of the convection zone to the corona. We found that there are about 104 small-scale heating events at any instant above the simulated area of 128 Mm2. They occur mainly at heights between 1.5 and 3.0 Mm. We determine the average value of their projected vertical extent, which ranges from 375 to 519 km over time, and we show that height, volume, and energy distribution of the events at any instant resemble power laws. Finally, we demonstrate that larger heating structures are a combination of much smaller heating events and that small-scale heating events dissipate enough energy to maintain the coronal energetic balance at any instant.