Scattering of Electromagnetic Waves from the Disturbance Caused by a Rapidly Moving Body in Plasmas

摘要

The scattering of electromagnetic waves by a body moving in a plasma is discussed in detail. General theory covering scattering phenomena is developed with emphasis on a perturbation method which can be used to obtain reasonably accurate differential cross section under two different physical conditions. The general theory is extended to investigate the following two problems: the scattering of electromagnetic waves from the disturbance caused by a rapidly moving body in the ionosphere and the scattering of electromagnetic waves from the turbulent wake produuced by a re-entry vehicle. In the first problem, kinetic equations are used to find the frequency spectrum of the electron density fluctuations in terms of which the differential scattering cross-section can be expressed. In the second problem the differential scattering cross-section is obtained in terms of the correlation function for turbulence, which can be estimated by using the correlation length. (Author)