Abstract
The frequency spectra is evaluated and the energy balance investigated for the transmitted and reflected transient electromagnetic waves that are generated when a monochromatic source drives a finite width plasma in which a step increase in density occurs. The source wave undergoes up-conversion to a frequency which depends on the initial and final plasma frequencies. When the final density is many times the plasma critical density transmission resonances result in multiple peaks in the frequency spectra. A tunneling effect is described in which a burst of energy is transmitted from the plasma immediately following the density transition.
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