In Space Tail Region Plasma Field Interactions

In this thesis, the non-steady and nonlinear interactions between the aircraft and space plasma have been studied in detail when the aircraft moves in ionosphere. The influence of these interactions lie in two aspects: on one hand, the concentration of charged particles will change; on the other hand, the alteration of electric field can also appear because of the change of the distribution of charged particles around the aircraft. To investigate these problems, the thesis consists of four chapters.In chapter one, some basic concepts about plasma physics and some general mechanisms of interactions have been introduced. In addition, we also introduce the parameters of space environment, basic equations which usually are used, some instabilities of plasma and some results of research when we discuss these problems of interactions between the aircraft and space plasma around it.In chapter two, using the hydrodynamical equations for electrons and Maxwell equation and through complicated calculation, we finally obtain a set of equations which describe the non-steady and nonlinear interactions between plasma and field in the wake region of a moving body in space.In chapter three, giving an initial disturbed transverse electric field and selecting the parameters in ionosphere, then we numerically simulate these equations we have get. The results of numerical calculation show that the electric field will collapse then produce solitons and density cavitons are formed due to the interactions between the aircraft and plasma.In chapter four, some discussions and conclusions are presented. And we also elucidate some characteristics of solitons and density cavitons which have formed, which has most important value to detect the moving body which has a 'stealth' characteristic.