弱电离等离子体对电磁波吸收的物理模型和数值求解

从物理基本方程、理论证明和数值分析三方面说明了在一维平板模型中，含时波动方程和亥 姆霍兹方程是等价的，即使电磁波波长小于等离子体的尺度，电磁波的全波解也具有简谐形 式. 对电磁波在弱电离强碰撞等离子体中的传播特性进行了数值研究，结果表明，弱电离强 碰撞等离子体对电磁波具有很强的吸收特性. 关键词： 电磁波 弱电离等离子体 过阻尼

A model of the absorption of electromagnetic waves by weakly ionized plasma and the numerical calculation

It is shown in three different ways that the wave equation varying with time and the Helmholtz equation are equally effective for analysing the transmission of electromagnetic waves from the weakly ionized plasma in the plane geometry. Eve n when the scale length of plasma approaches the waves length, the electromagnet ic waves are still simple harmonic waves. The properties of transmission of elec tromagnetic waves from the weakly ionized and highly collisional plasma are stud ied numerically. The results show that the highly collisional plasma is a good m icrowave absorber.