大气重力波与电子密度扰动的耦合

THE COUPLING BETWEEN ATMOSPHERIC WAVES AND ELECTRON DENSITY PERTURBATIONS

本文从相互耦合的大气流体方程和双流体等离子体方程出发,导出了赤道F区大气重力波和电子密度扰动的耦合色散关系,据此对两者的共振相互作用作了进一步的理论分析。结果表明,大气重力波可以通过共振耦合将部分能量转换给带电粒子,为赤道扩展F提供初始电子密度扰动;在这过程中,等离子体不稳定性对共振条件和共振耦合有着重要的影响。

From the atmospheric fluid equations and two-fluid equations of ionospheric plasmas coupled with each other, the coupling dispersion relation of atmospheric gravity waves and electron density perturbations in equatorial F region is derived and the resonant interaction between these two modes in different mediums is analyzed theoretically. The discussion shows that the gravity wave can transfer part of its energy to charged particles by resonance coupling mechanism and then induce initial electron density disrnrbanc for equatorial spead F. In the process, the resonance condition and resonance coupling are significantly influenced by plasma instabilities.