中文摘要：

通过理论研究与数值计算,不均匀等离子体中Langmuir波与电磁波的相互作用及其线性模式转换规律得到了充分的展示.导出了不均匀等离子体中的电磁色散关系,研究了入射电磁波或Langmuir波在通过不均匀等离子体的过程中发生转换的物理过程,以及波的传播矢量随空间坐标变化的关系,并对电磁波与Langmuir波相互作用的机理进行了讨论.研究结果对密度梯度所驱动的等离子体波产生电磁辐射的研究具有重要意义.

英文摘要：

The linear conversion and interactions of Langmuir and electromagnetic waves in an inhomogeneous plasma has been demonstrated by numerical and theoretical methods adequately. The dispersion relation of electromagnetic wave in an inhomogeneous plasma has been deduced. The physical processes of conversion of incident electromagnetic or Langmuir wave in an inhomogeneous plasma and the relationship of the spread vector with the coordinates have been researched,and the mechanism of interactions between the electromagnetic and Langmuir waves have been discussed. The results are of significance for the generation of electromagnetic radiation from density gradient-driven plasma.