非均匀磁等离子体中电磁波和电声波耦合传播理论

我们从磁流体力学基本方程出发,给出了计及外加常数磁场情况下规则非均匀等离子体中电磁波和电声波的耦合传播方程。在选用的电子密度剖面下,求解了该方程组的边界值问题,得到了|P_1|和|H_x|的数值解,进而证明了在此基础上我们得到的电磁波和电声波传播的简单近似耦合方程组是可用的。 最后,我们计算了Debye长度和等离子体波长,指出在等离子体鞘套中等离子体波不能辐射出去的主要原因是在鞘套外边界严重的Landau阻尼造成的,并非在激波线强间断处的多次反射结果。 同时,也对所得到的传播耦合方程的普遍性进行了讨论。

A THEORY OF COUPLING PROPAGATION FOR ELECTROMAG-NETIC AND ELECTRON ACOUSTIC WAVES IN INHOMOGENEOUS MAGNETO-PLASMA

Starting from magneto-hydrodynamic linear equations, we have got the coupling propagation eqs. for electromagnetic and electron acoustic waves in inhomogeneous magneto-plasma, then with the selected electron density profiles and boundary conditions, we have obtained numerical solutions of |P1| and |HX|. We have also deduced a set of simplified and easily applicable approximate coupling propagation eqs., and proved the applicability of this simplified set of eqs..Finally, we have computed Debye length and plasma wave length. We have shown that it is the Landau dampling which causes the incapability of radiation of plasma wave out of plasma sheath, rather than the multi-reflections of waves at the strong dis-continuty.At the same time, we have discussed the generality of the coupling propagation equations.