The Absorptivity Spectrum of a Uniform, Anisotropic Plasma Slab

Abstract

Using a generalized formulation of Kirchhoff's law it is possible to relate the equilibrium electromagnetic radiation spectrum of a body to its absorptivity spectrum. The microwave absorptivity of a uniform anisotropic plasma slab to a normally incident electromagnetic wave is obtained by matching fields at the boundaries and is solved completely for the model chosen.The absorptivity spectrum of the plasma slab is computed for waves propagating parallel to and normal to an applied static magnetic field for various electron densities, electron collision frequencies, and slab thicknesses. Peaks in the absorptivity spectrum occur around the edges of the "stop-bands". In general, the absorptivity increases with slab thickness and collision frequency. The effect of internal reflections is included and gives rise to undulations in the absorptivity spectrum.

Propagation of Oblique Electromagnetic Waves Through a Warm Plasma Slab With Normal Magnetostatic Field

“…The several maxima in these curves can be explained in terms of the occurrence of stop bands defined by French, Cloutier, and Bachynski (1961). For a lossl.…”

“…nature; however, the absorption coefficient is greater for larger slab-width, except at a small frequency region where it shows oscillations. The curves for absorption coefficients have peaks, which are due to stop bands investigated by French, Cloutier, and Bachynski (1961).…”

“…Figure 6b shows the absorp· tion coefficient A versus 0 for the same parameters as in figures 6a for fie= 0.01. French, Cloutier, and Bachynski (1961) showed that for a temperate plasma, with arbitrary static magnetic field such that 0 ~ Ob and 0 ~ l, the absorption coefficient A for a normally incident wave is proportional to Oc and d(Ap, inversely proportional to oJ1-(w being the wave frequency), and independent of 01> and the orientation of the magnetostatic field. The same conclusions can be reached from figures 4, 6a, b.…”

Oblique transmission of electromagnetic waves through a magnetized ferrite slab

“…linear and nonlinear effects. Theoretical studies using the linear small signal theory have been made on the reflection, transmission and absorption spectra [Chawla et al, 1967;Unz, 1963Unz, , 1965French et al, 1961;Zivanovic et al, 1964]. Of practical importance is the propagation of radio waves in the ionosphere, space plasmas, and transmission of light through laser produced plasmas.…”