Abstract
We present the phase shift of an electromagnetic wave passing throughan atmospheric plasma layer. In this kind of plasma, the phase shiftdepends not only on the line average electron density and layer width,but also on the electron-neutral collision frequency. Since thecollision frequency is close to or even larger than the incidentmicrowave frequency, a one-dimensional code for the numerical solutionof the wave equation with full time and space variables is establishedto give the phase shift. When the width and the pressure (hence theelectron-neutral collision frequency) are known, the measurement ofphase shift will uniquely determine the line average electrons densityin an atmospheric plasma.
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