全变形振荡磁通管的数值模拟
Simulations of fully deformed oscillating flux tubes
摘要：
近年来，大量的数值研究集中在Kelvin-Helmholtz不稳定性（KHI）在振荡冕环动力学中的重要性。这一过程增强了能量向更小尺度的转移，并且在考虑诸如电阻率之类的耗散机制时，与日冕环的加热有关。然而，湍流层预计在环路的外部区域附近。因此，波加热的影响预计将被限制在环的外层，使其密度更大的内部没有加热机制。在目前的工作中，我们的目标是研究从一个脚点驱动的扭结驻波在日冕环波加热效应的空间演化。使用MPI-AMRVAC代码，我们进行了理想的，三维磁流体动力学模拟的足点驱动的横向振荡的冷，直的日冕通量管，嵌入在一个较热的环境。我们还构建了我们的模拟使用FoMo代码的前向模型。开发的横波诱导开尔文-亥姆霍兹（TWIKH）辊在整个管横截面上扩展，并完全覆盖它。这种湍流显著地改变了初始密度分布，导致完全变形的截面。因此，电阻加热速率和粘性加热速率在整个回路截面上都增加。电阻加热速率在足点附近达到最大值，而粘性加热速率在顶点处达到最大值。我们的结论是，即使是单周期驱动器可以传播波加热整个回路截面，潜在地提供了一个加热源的内环区域。尽管环的结构完全变形，但正演模拟仍然显示结构看起来像一个环。
英文摘要：
In recent years, a number of numerical studies have been focusing on the significance of the Kelvin-Helmholtz instability (KHI) in the dynamics of oscillating coronal loops. This process enhances the transfer of energy into smaller scales, and has been connected with heating of coronal loops, when dissipation mechanisms, such as resistivity, are considered. However, the turbulent layer is expected near the outer regions of the loops. Therefore, the effects of wave heating are expected to be confined to the loop's external layers, leaving their denser inner parts without a heating mechanism. In the current work we aim to study the spatial evolution of wave heating effects from a footpoint driven standing kink wave in a coronal loop. Using the MPI-AMRVAC code, we performed ideal, three dimensional magnetohydrodynamic simulations of footpoint driven transverse oscillations of a cold, straight coronal flux tube, embedded in a hotter environment. We have also constructed forward models for our simulation using the FoMo code. The developed Transverse Wave Induced Kelvin-Helmholtz (TWIKH) rolls expand throughout the tube cross-section, and cover it entirely. This turbulence significantly alters the initial density profile, leading to a fully deformed cross section. As a consequence, the resistive and viscous heating rate both increase over the entire loop cross section. The resistive heating rate takes its maximum values near the footpoints, while the viscous heating rate at the apex. We conclude that even a monoperiodic driver can spread wave heating over the whole loop cross section, potentially providing a heating source in the inner loop region. Despite the loop's fully deformed structure, forward modelling still shows the structure appearing as a loop.
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