Research On The Dynamics And Electromagnetic Characteristics Of Dusty Plasma

The dusty plasma is a plasma system with a large number of charged dusty particles,which has important scientific significance and potential application value for many scientific and technological fields.Also,it is an important interdisciplinary frontier.Although many theoretical and experimental researches on the dusty plasma physics have been carried out and the physical properties of the dusty plasma have been basically understood.However,the understanding of the dynamic process of dusty plasma has been limited,and little research focusing on the electromagnetic property of the dusty plasma has been conducted so far.On account of the above contents,this paper aims at the frontier scientific problem,which is based on the plasma physics and the complex medium electromagnetic wave propagation theory.Moreover,the mechanism and process of the interaction between the dusty particle and the plasma are studied,and the physical model describing the electromagnetic characteristics of the dusty plasma is established.Also,some experimental studies are carried out.The main researches include the following aspects:The charge and discharge processes of the dusty particle in the plasma are studied by using the existing spherical particle charge model,and the dynamic process of Coulomb elastic collision between the plasma and the charged dusty particles as well as the impact of the neutral molecule on the collision between charged particles is studied.The electromagnetic parameter model of the dusty plasmas is studied based on the traditional plasma dynamics,and a new method describing the electromagnetic property of the dusty plasmas is proposed.Moreover,The theoretical expression of the permittivity of the homogeneous dusty plasma with different conditions is obtained.In addition,the magnetic susceptibility of the dusty plasma is deduced by the classical theory of the magnetization motion equation,and the permeability expression of the magnetic dusty plasma is obtained.The application study of the electromagnetic property of the dusty plasma has been carried out by using the dielectric coefficient expression of the dusty plasma.The effect of the dusty plasma on the electromagnetic wave,including expanding the absorption peak and band of the electromagnetic wave has been studied.Meanwhile,we use the experimental device to investigate the dusty plasma electromagnetic wave absorption,and the qualitative experimental results agree well with the Theoretical expectations,which verifying the rationality of our Theory.The incoherent scattering of the dusty plasma has been carried out by using the dielectric coefficient expression of the dusty plasma.And the effects of the size,temperature and density of the dust on the incoherent scattering spectrum are discussed,and the basic physical law of the incoherent scattering spectrum of the dusty plasma is obtained.The dynamic mechanism of the abnormal stratification of the dusty plasma in the mesopause during the polar summer is studied according to the theoretical analysis and the experimental verification.And the numerical simulation is used to study the dynamic evolution of the layered structure of the charged dusty particle under the disturbance of the atmospheric gravitational wave.Meanwhile,the obtained theoretical model is tested by using the historical rocket sounding data and the radar data.According to the comparison between the numerical simulation results and the experimental observation,many observed phenomena can be reproduced or explained,which shows the reliability of the theoretical model.These theoretical results lay a strong foundation for explaining of the physical mechanism of the radar echo formation in the mesopause during the polar summer.