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Dispersion surfaces for low-frequency modes

P H Yoon, T-M Fang2008年Plasma Physics and Controlled FusionIF 2.2出版社

This paper derives analytical expressions of the dispersion relations for the three basic ideal MHD waves, namely, fast, slow and Alfvén waves, as well as their generalizations to include non-ideal MHD effects. It is shown that while the Hall-MHD physics accurately describes ion-cyclotron resonance, it fails to include lower-hybrid resonance. In contrast, the cold two-fluid formalism does account for the lower-hybrid resonance as part of the magnetosonic-whistler mode dispersion surface. However, the cold-plasma approximation rules out the ion-sound mode at the outset. Moreover, it cannot deal with the kinetic Alfvén-ion cyclotron (AIC) mode. Therefore, the cold-plasma AIC mode is extended to kinetic AIC mode. Thermal ion-sound wave dispersion relation is also derived by retaining the kinetic thermal correction.

日本語訳

本論文では、理想MHDにおける三つの基本波動、すなわち高速波、低速波、アルヴェーン波の分散関係の解析的表現を導出し、さらに非理想MHD効果を含む場合への一般化を行う。ホールMHDの物理はイオンサイクロトロン共鳴を正確に記述する一方で、低混成共鳴を含まないことが示される。対照的に、冷たい二流体形式は、マグネトソニック・ホイッスラーモードの分散曲面の一部として低混成共鳴を正しく記述する。しかし、冷プラズマ近似は音波モードを最初から排除する。さらに、この近似は運動論的アルヴェーン・イオンサイクロトロン(AIC)モードを扱うことができない。そこで、冷プラズマのAICモードを運動論的AICモードへ拡張する。運動論的熱補正を保持することにより、熱的イオン音波の分散関係も導出される。

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