WAVEFORM ANALYSIS OF TWEEK ATMOSPHERICS

Abstract

The waveform of tweek atmospherics was analyzed theoretically. In the theory of mode currents the following two methods were used; the cylindrical wave method and multi-refrection method. In both methods the source current was Fourier-expanded by using the electric images. The identical frequency dispersion equation was then derived by the two methods. The calculated result was compared with the observed ones. In order to improve the theory. a source current waveform and the ray theory were introduced. The calculated first mode waveform was compared with the observed waveform and discussions followed.