论文标题
通量太阳能突出的大振幅振荡的数值模拟
Numerical simulations of large-amplitude oscillations in flux-rope solar prominences
论文作者
论文摘要
语境。太阳突出的大振幅振荡（老挝）非常壮观，但知之甚少。这些动作的振幅大于$ 10 {\ mathrm {\，km \，s^{ - 1}}}} $，并且可以由外部扰动触发，例如摩尔顿或eIT波。 目标。我们的目的是使用现实的突出模型和外部干扰触发机制分析大振幅振荡的性能。 方法。我们使用具有两个剪切角和密度对比度值的磁通绳模型对老挝进行时间依赖性的数值模拟。我们使用水平和垂直触发来研究突出的内部模式。此外，我们使用从外部到达的扰动，以了解这种外部干扰如何产生老挝。 结果。纵向振荡的时期及其具有高度的行为与摆模型显示出良好的一致性。横向振荡周期保持恒定，高度表明全局正常模式。横向振荡通常比纵向振荡短。 结论。纵向和横向振荡的周期仅显示出对磁性结构的剪切角和突出密度对比的弱依赖性。外部干扰使两种极化的磁通绳令人振奋。它们的特性是纯粹的水平和垂直驾驶激发的人的混合物。
Context. Large-amplitude oscillations (LAOs) of the solar prominences are very spectacular but poorly understood phenomena. These motions have amplitudes larger than $10 {\mathrm{\, km \,s^{-1}}}$ and can be triggered by the external perturbations, e.g., Moreton or EIT waves. Aims. Our aim is to analyze the properties of large-amplitude oscillations using realistic prominence models and the triggering mechanism by external disturbances. Methods. We perform time-dependent numerical simulations of LAOs using a magnetic flux rope model with two values of the shear angle and the density contrast. We study the internal modes of the prominence using the horizontal and vertical triggering. In addition, we use the perturbation that arrives from outside in order to understand how such external disturbance can produce LAOs. Results. The period of longitudinal oscillations and its behavior with height show good agreement with the pendulum model. The period of transverse oscillations remains constant with height, suggesting a global normal mode. The transverse oscillations typically have shorter periods than the longitudinal oscillations. Conclusions. The periods of the longitudinal and transverse oscillations show only weak dependence on the shear angle of the magnetic structure and the prominence density contrast. The external disturbance perturbs the flux rope exciting oscillations of both polarizations. Their properties are a mixture of those excited by purely horizontal and vertical driving.
