Alfvén continuum with toroidicity
Alfvén continuum with toroidicity
复制标题
具有环形的阿尔文连续谱
DOI:
10.1063/1.865926
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发表时间:
1986
影响因子:
4.6
通讯作者:
S. Mahajan
中科院分区:
文献类型:
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作者:
S. Riyopoulos;S. Mahajan
The symmetry property of the magnetohydrodynamic (MHD) wave propagation operator is utilized to express the toroidal eigenmodes as a superposition of the mutually orthogonal cylindrical modes. Because of the degeneracy among cylindrical modes with the same frequency but resonant surfaces of different helicity, the toroidal perturbation produces a zeroth‐order mixing of the above modes. The toroidal eigenmodes of frequency ω20 have multiple resonant surfaces, with each surface shifted relative to its cylindrical position and carrying a multispectral content. Thus a single helicity toroidal antenna of frequency ω0 couples strongly to all different helicity resonant surfaces with matching local Alfven frequency. Zeroth‐order coupling between modes in the continuum and global Alfven modes also results from toroidicity and degeneracy. The perturbation technique used in this study is the MHD counterpart of the quantum‐mechanical methods and is applicable through the entire range of the MHD spectrum.
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