论文标题

在二维中的冠状孔和活性区域磁液压溶液的构建:力和能量平衡

Construction of coronal hole and active region magnetohydrostatic solutions in two dimensions: Force and energy balance

论文作者

Terradas, J., Soler, R., Oliver, R., Antolin, P., Arregui, I., Luna, M., Piantschitsch, I., Soubrié, E., L., J., Ballester

论文摘要

冠状孔和活动区域是在太阳大气中发现的典型磁性结构。我们提出了几种在二维中代表这些结构的磁液压平衡溶液。我们的模型包括有限的等离子体-$β$和重力的效果,但独特的特征是,我们结合了具有与观测值相似的属性的热结构。我们开发了一种半分析方法来计算平衡构型。使用这种方法,我们在代表冠状孔的开放磁场中获得冷且密集的等离子体结构,而在封闭的磁性构型中,我们实现了活动区域的特征性热和过度密度的等离子体排列。尽管冠状孔和活性区域似乎是拮抗结构,但我们发现可以使用取决于通量功能的常见热结构来描述它们。除了力平衡之外,使用A后验方法将能量平衡包括在构造模型中。从模型中热传导和辐射损耗的二维计算,我们推断出所需的加热功能以达到能量平衡。我们发现,温度依赖性是一个重要的参数,可以阻止系统在某些空间位置实现热平衡。这些结果的含义将详细讨论。

Coronal holes and active regions are typical magnetic structures found in the solar atmosphere. We propose several magnetohydrostatic equilibrium solutions that are representative of these structures in two dimensions. Our models include the effect of a finite plasma-$β$ and gravity, but the distinctive feature is that we incorporate a thermal structure with properties similar to those reported by observations. We developed a semi-analytical method to compute the equilibrium configuration. Using this method, we obtain cold and under-dense plasma structures in open magnetic fields representing coronal holes, while in closed magnetic configurations, we achieve the characteristic hot and over-dense plasma arrangements of active regions. Although coronal holes and active regions seem to be antagonistic structures, we find that they can be described using a common thermal structure that depends on the flux function. In addition to the force balance, the energy balance is included in the constructed models using an a posteriori approach. From the two-dimensional computation of thermal conduction and radiative losses in our models, we infer the required heating function to achieve energy equilibrium. We find that the temperature dependence on height is an important parameter that may prevent the system from accomplishing thermal balance at certain spatial locations. The implications of these results are discussed in detail.

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