空间等离子体云精细化仿真及传播特性研究

Refined modeling and propagation characteristics for the space plasma cloud

在电离层中释放钐(Sm)等活泼金属气体,通过光致电离或化学电离,能够人工生成空间等离子体云,以其作为散射体,可开展超短波超视距通信和探测研究。本文开展了电离层Sm释放的精细化效应仿真研究,考虑了热层风场、地磁场、Sm释放速度和流量、运载器飞行速度等参量对Sm在电离层中扩散过程的影响。同时,采用射线追踪方法,研究了空间等离子体云的电波传播特性。结果表明释放参数和环境参数对等离子体云的形态和演化过程具有重要影响,等离子云在不同剖面形态各异,沿地磁场方向及风场方向出现明显拉伸,进一步对等离子体云的传播效应产生影响,导致电波在等离子体云不同剖面传播特性出现差异。

The release of active metal vapor,such as samarium(Sm),in the ionosphere,can generate artificial space plasma cloud by optical or chemical ionization,which can be used as a scatterer to carry out over-the-horizon communication and detection research.In this paper,a refined effects simulation model of Sm release by rocket is carried out,taking into account the effects of the thermospheric wind field,the geomagnetic field,the Sm injection velocity and flux,the rocket velocity on the Sm diffusion process in the ionosphere.Meanwhile,ray tracing method is used to study the radio wave propagation characteristics of the space plasma cloud.The results indicate that the release parameters and environmental parameters have a significant impact on the morphology and evolution process of artificial space plasma cloud,and the plasma cloud has different morphologies in different profiles,with obvious stretching along the direction of the geomagnetic field and the direction of the wind field,which further affects the propagation effect of the plasma cloud,leading to differences in propagation characteristics of the radio wave in different profiles of the plasma cloud.further affecting the radio propagation effect of artificial space plasma clouds.