Research On The Space Dusty Plasma Orbital Motion

Dusty plasma exists widely in space plasma, industry plasma, laboratory plasma and high-temperature nuclear fusion plasma. The physics of dusty plasmas is a topic of growing importance, which has gained more and more interest over the last few years not only from the academic point of view, but also from the view of its new aspects in space and modern astrophysics, semiconductor technology, fusion devices, plasma chemistry, crystal physics, biophysics, etc.The earth space dusty plasma has attracted more and more attention as the space activity is frequent. There are cosmic dusty particles and human space activity dusty particles in LEO. Since the dusty gains are immersed in both an ambient plasma and a radiative environment, they are necessarily electrically charged. As a result, the grain can be coupled to the plasma through electric and magnetic field. Due to their large mass, dusty gains are also subject to significant gravitational forces, sun radiative forces and drag forces. These charged grains in 400-250,000km space with high spatial density go around the earth in quite stabile orbits.In this paper, considering the earth space dusty plasma in normal environment, a mathematical model of the orbital motion of submicron charged grains in the earth's plasmasphere space is established. Then, on the basis of numerical calculation of trajectories, the peculiarities of motion of dusty grains in the earth's space are investigated. The orbits evolution and annihilation of charged grains in LEO have been discussed. The most important result of these investigations is the found of long-term residence of some dusty grains in the earth's vicinity. Finally, we end with suggestions for strategy on defending dusty grains in space activities.