Electromagnetic Pulse Propagation in Bounded Plasmas, Anisotropic Plasmas, and Lossy Plasmas.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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The dispersion of electromagnetic pulses in plasmas is considered. Maxwells equations are used to determine the wave equation in the Fourier transform domain. Thus, the fields in the time domain are determined by inverse Fourier transformations. Asymptotic solutions for the fields are obtained via the saddlepoint method of integration. The investigation considers three different plasma models. The first model is a homogeneous, isotropic, plasma slab with infinitesimal boundaries. The reflection and transmission coefficients are found to be frequency dependent. When an air-plasma-air problem is considered, the transmission coefficient is almost one and the boundary effects are thus negligible. The second model is a homogeneous, anisotropic plasma where propagation along magnetic field lines is considered. Responses to both double exponential and delta function initial pulse shapes are obtained. The results show significant transient Faraday rotation, even for weak magnetic fields. The third model is a homogeneous, isotropic, lossy plasma. Modified author abstract
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