Resonant Absorption of Alfvén Waves in Steady Coronal Loops
Resonant Absorption of Alfvén Waves in Steady Coronal Loops
复制标题
稳定日冕环中阿尔文波的共振吸收
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
R. Erdélyi
中科院分区：
文献类型：
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作者：
R. Erdélyi
在可压缩粘性MHD模型中，研究了平衡流对冕环线性Alfvén共振的影响。通过有限元程序，完整的线性化驱动MHD方程组求解的一维平衡模型，其中的平衡量只依赖于径向坐标。对两类冕环模型的Alfvén波共振吸收的计算表明，共振吸收过程的效率强烈地依赖于平衡参数和共振波的特性。我们发现，一个稳定的平衡剪切流也可以显着影响的共振吸收的阿尔文波在日冕磁通量管。因此，平衡流的存在可能对共振阿尔文波和日冕加热很重要。参数分析还表明，共振吸收可以强烈增强的平衡流，甚至到入射波的总耗散。
The effect of equilibrium flow on linear Alfvén resonances in coronal loops is studied in the compressible viscous MHD model. By means of a finite element code, the full set of linearised driven MHD equations are solved for a one-dimensional equilibrium model in which the equilibrium quantities depend only on the radial coordinate. Computations of resonant absorption of Alfvén waves for two classes of coronal loop models show that the efficiency of the process of resonant absorption strongly depends on both the equilibrium parameters and the characteristics of the resonant wave. We find that a steady equilibrium shear flow can also significantly influence the resonant absorption of Alfvén waves in coronal magnetic flux tubes. The presence of an equilibrium flow may therefore be important for resonant Alfvén waves and coronal heating. A parametric analysis also shows that the resonant absorption can be strongly enhanced by the equilibrium flow, even up to total dissipation of the incoming wave.