- 作者: 林崇安
- 中文摘要: 本文的目的在於研究非均向性的磁性電漿中的磁力線共振理論。此處採用CGL方程式。並用直角坐標,在本模式 中,磁埸指向z方向而在y方向?不均勻。由線性CGL方程式中先導得電漿位移的波動方程式,由此得知阿爾文波與 磁聲波耦合在一起,並得知在特異點處磁力線會共振,該處ω2=kz2(νA2+ν⊥2-ν||2)。再由波動方程式中得出共振點附近 的解以及擾動磁場的波極化。此共振理論可應用至太陽大氣及磁層中ν⊥及ν||不相等之區域。在磁暴及副暴時期,由此 共振過程,在磁層?可?生地磁脈動。
- 英文摘要: The purpose of this paper is to study the field line resonant theory in a magnetized anisotropic plasma. CGL equations are used. For simplicity, we adopt Cartesian coordinates and use a model in which the straight magnetic field in the z direction and the nonuniformity in the y direction are taken. The wave equation of the plasma displacement is derived from the linearized CGL equations. Due to plasma non-uniformity, this equation shows the coupling between the shear Alfven wave and magnetosonic waves. It is found that the field lines will resonate at the singular points where ω2=kz2(νA2+ν⊥2-ν||2) Here νA is the speed of the Alfven wave, and ν⊥ and ν|| are the thermal speeds perpendicular and parallel to the magnetic field, respectively. The solution of this wave equation near the resonant point is obtained and the wave polarization of the perturbed magnetic field is studied. This field line resonant theory can be applied to the solar atomosphere and magnetosphere where ν⊥ and ν|| are unequal. During a magnetic storm and magnetospheric substorm, magnetic pulsations can be generated within the magnetosphere by this resonant process.
- 中文關鍵字: field line resonant theory; anisotropic plasma
- 英文關鍵字: --