中性气体释放人工产生气辉

电离层中分子性的离子与电子的复合要比氧离子与电子的辐射性复合快得多,因此火箭发动机产生的尾气和空间等离子体主动实验中主动释放的中性气体会对电离层有很大的影响,这么大的电离层扰动现象在过去的实验中经常可以观测到,根据中性气体在热层背景中的扩散方程,考虑电离层F区主要的离子化学反应,研究了H2,H2O和CO2气体在电离层高度上的扩散过程和电离层对所释放气体的响应,计算了气辉的体发射系数和发射强度．结果表明,中性气体在电离层高度上扩散非常迅速,在F区的一些高度上,主要正离子成分由O 转变为其他分子离子,且在释放过程中伴随气辉发射,发射气辉的波长和特征与释放物质的种类有关。

Artificially Created Airglow by Neutral Gas Release

In case of injection of neutral gases into ionosphere, atomic oxygen ions undergo charge transfer reactions with these injected molecules. The recombination rate coefficients of molecular ion with electron are several orders greater than that of the dominant atomic oxygen ion in ionosphere F region. Therefore, rockets exhaust gases produced by engine and artificially released neutral gases in the space active plasma experiments can substantially affect ionosphere, for example, the formation of electron depletion region, which is referred to as ionospheric holes, and these phenomena have been observed in many experiments. In this paper, in terms of diffusion equation of neutral gas in thermosphere and main ion-chemistry reactions in ionospheric F region, the diffusion processes of H2, H2O and CO2 and ionospheric response to released gases are investigated. Additionally, airglow volume emission rates and intensity from the release at ionospheric altitudes are calculated The results show that the diffusion of released neutral gas in F region is very quick, and these gas molecules can cause a large-scale depletion of ionospheric electron density. At some altitudes of F region, the dominant positive ion converts into other molecular ion, such as H2O . During the diffusion process, airglow will be excited, and its wavelength and emission characteristics depend on the released materials.