论文标题
在尖端连续体中经历共振吸收的磁流体动力波的混合特性
Mixed properties of magnetohydrodynamic waves undergoing resonant absorption in the cusp continuum
论文作者
论文摘要
结构化太阳大气中磁水动力学(MHD)波的观察结果表明,这些波是受阻,因此可以有助于大气加热。在本文中,我们着重于尖连连续体中共振吸收的阻尼机制。这个过程发生在海浪穿过不均匀等离子体的过程中。我们的目的是确定在圆柱太阳大气结构的过渡层中,在CUSP连续体中,MHD波的性质,例如光孔或冠状环。根据哪个数量的主导地位,人们可以评估所讨论的模式最类似于哪种类型的经典MHD波。为了研究这些波的特性,我们通过分析确定了具有频率频率的波的压缩,位移和涡度的空间特征,从而经历了共振吸收。我们通过电阻MHD框架中的曲线计算来确认这些分析推导。我们表明,尖端连续体中模式的主要数量是平行于背景磁场的位移,并且在方位角方向(即垂直于背景磁场和沿环边界)的涡度分量平行于涡度磁场和涡度分量。
Observations of magnetohydrodynamic (MHD) waves in the structured solar atmosphere have shown that these waves are damped and can thus contribute to atmospheric heating. In this paper, we focus on the damping mechanism of resonant absorption in the cusp continuum. This process takes places when waves travel through an inhomogeneous plasma. Our aim is to determine the properties of MHD waves undergoing resonant absorption in the cusp continuum in the transition layer of a cylindrical solar atmospheric structure, such as a photospheric pore or a coronal loop. Depending on which quantities dominate, one can assess what type of classical MHD wave the modes in question resemble most. In order to study the properties of these waves, we analytically determine the spatial profiles of compression, displacement, and vorticity for waves with frequencies in the cusp continuum, which undergo resonant absorption. We confirm these analytical derivations via numerical calculations of the profiles in the resistive MHD framework. We show that the dominant quantities for the modes in the cusp continuum are the displacement parallel to the background magnetic field and the vorticity component in the azimuthal direction (i.e. perpendicular to the background magnetic field and along the loop boundary).