高密度尘埃等离子体的非相干散射理论研究  

Study on incoherent scatter theory of high density dusty plasma

作　　者：徐彬[1] 李辉[1,2] 王占阁[1] 许正文[1] 吴健[1] 

机构地区：[1]中国电波传播研究所,电波信息环境特性及模化技术国防科技重点实验室,青岛266107 [2]哈尔滨工业大学理学院,哈尔滨150001

出　　处：《物理学报》2017年第4期316-321,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:41004065,41104108,61601419,11672068);电波环境特性及模化技术国防重点实验室基金资助的课题~~

摘　　要：将带电尘埃粒子的影响引入到非相干散射理论中,建立了包含电子、离子和尘埃组分的尘埃等离子体非相干散射理论模型.对火箭喷焰高密度尘埃等离子体条件下,离子谐振区和尘埃谐振区的非相干散射谱线进行了计算,讨论了尘埃粒径、温度和密度对谱线结构的影响,获得了尘埃颗粒影响非相干散射回波特征的基本物理规律.Incoherent scatter radar is one of the most important detection instruments of the space plasma. But because of the low dust density in natural space plasma, the contribution of charged dust to incoherent scatter spectrum can be completely ignored, therefore the incoherent scattering theory has not appeared in dusty plasma. In the solid rocket plume, the propellant combustion can form a large number of nanometer- and micronmeter-sized dusty particles, and produce a high electron density from high temperature ionization, which makes considerable contributionto charged dusty particles with the high density. Therefore, we develop the incoherent scattering theory of dusty plasma in order to calculate the scattering characteristics of high density dusty plasma produced by rocket plume, for example. The theoretical model including electrons, ions and dusty particles is established by combining effects of charged dusty particles. The incoherent scatter spectral lines of ion resonance region and dust resonance regionare calculated. The effects of dusty particle radius, temperature and density on spectral line structure are discussed. With the increases of dusty particle radius and density, the amplitude of power spectrum increases. With the increase of dust temperature, the amplitude of power spectrum decreases. In the dust resonance region, the control mechanism of dust in spectrum is similar to that of the ions. With the increase of particle size （mass） and decrease of the temperature, the spectrum width narrows, and amplitude and area increase with the increase of density. But in the ion resonance region, the dust control mechanism is completely different, and the influence of the dust on ion line is in the way of attracting ions. So with the increase of dust density, ion line characteristics do not show that the area increases, and dust controls ions by adjusting the Debye radius or electrostatic shielding ball size. By comparing the ion lines with and without dust under the same parameters conditions, the amplit

关 键 词：尘埃等离子体 火箭喷焰 非相干散射理论 尘埃密度 

分 类 号：P354[天文地球—空间物理学]