人工等离子体云的时间演化

Time evolution of artificial plasma cloud

分析了高空中人工等离子体云的时间演化,发现人工等离子体云中电子密度的空间分布存在着指数衰减区和平缓衰减区。等离子体发生器的粒子流密度仅影响指数衰减区,对平缓衰减区没有什么影响。平缓衰减区中的平均电子密度约为中性分子密度的十万分之一,并且可以覆盖较大范围。这些结果对于电磁波与人工等离子体相互作用的研究、导弹和空间飞行器的等离子体隐身研究及人工等离子体发生器的设计有一定的参考价值。

By analyzing the time evolution of an artificial plasma cloud at high altitude, we found that there are two zones, exponential attenuation zone and linear attenuation zone, in the spatial distribution of electron density of artificial plasma clouds. The plasma generator's particle flux density only contributes to the exponential attenuation zone, and has no effect on the linear attenuation zone. The average electron density in linear attenuation zone is about 10^(-5) of neutral particle density, and can overcast wider area. The conclusion will be valuable to the research of electromagnetic wave and artificial plasma interaction, the plasma invisibleness research of missile and special aerocraft, and the design of artificial plasma source.