论文标题
黑子模拟：半身形成和flut不稳定性
Sunspot simulations: penumbra formation and the fluting instability
论文作者
论文摘要
已提出扁平式不稳定性作为黑子通量管的地下结构的驱动力。我们进行了一系列数值实验，其中使用了具有不同初始曲率的通量管来研究扁平不稳定性对斑点地下结构的影响。我们使用了以前已用于模拟完整黑子的Muram代码，首先计算板几何形状中的四个黑子，然后是两个相反极性的完整圆形斑点。我们发现通量管的曲率确实决定了弹力管的程度 - 磁通管的弯曲越多，它变得越多。此外，具有较强曲率的黑子在表面具有强烈的水平田，因此很容易形成半纤维丝。凹槽的黑子最终从下方分解，light桥在开始后几个小时开始出现在表面。
The fluting instability has been suggested as the driver of the subsurface structure of sunspot flux tubes. We conducted a series of numerical experiments where we used flux tubes with different initial curvatures to study the effect of the fluting instability on the subsurface structure of spots. We used the MURaM code, which has previously been used to simulate complete sunspots, to first compute four sunspots in the slab geometry and then two complete circular spots of opposite polarities. We find that the curvature of a flux tube indeed determines the degree of fluting the flux tube will undergo - the more curved a flux tube is, the more fluted it becomes. In addition, sunspots with strong curvature have strong horizontal fields at the surface and therefore readily form penumbral filaments. The fluted sunspots eventually break up from below, with lightbridges appearing at the surface several hours after fluting commences.
