Nakariakov Valery M
Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
Philos Trans A Math Phys Eng Sci. 2006 Feb 15;364(1839):473-83. doi: 10.1098/rsta.2005.1711.
Polar plumes are cool, dense, linear, magnetically open structures that arise from predominantly unipolar magnetic footpoints in the solar polar coronal holes. As the Alfvén speed is decreased in plumes in comparison with the surrounding medium, these structures are natural waveguides for fast and slow magnetoacoustic waves. The simplicity of the geometry of polar plumes makes them an ideal test ground for the study of magnetohydrodynamic (MHD) wave interaction with solar coronal structures. The review covers recent observational findings of compressible and incompressible waves in polar plumes with imaging and spectral instruments, and interpretation of the waves in terms of MHD theory.
极羽是一种凉爽、致密、呈线性且磁开放的结构，它们源自太阳极区日冕洞主要为单极的磁足点。与周围介质相比，极羽中的阿尔文速度降低，这些结构是快磁声波和慢磁声波的天然波导。极羽几何形状的简单性使其成为研究磁流体动力学（MHD）波与太阳日冕结构相互作用的理想试验场。这篇综述涵盖了利用成像和光谱仪器对极羽中可压缩波和不可压缩波的最新观测结果，以及根据MHD理论对这些波的解释。
