Abstract
This paper presents a non standard analysis of systematic nonstationarity in data on ionospheric motions. The methodology is applicable to any analysis of ambient back-ground noise in communication systems which use the atmosphere as a medium. The data used in this paper were obtained from an array of radar-like devices called phase-path sounders, which measure the velocity of the vertical motion of the neutral gases in the ionosphere. The model fits between 36% and 5%, of the variation of the log spectrum for frequencies less than 3 CPH and greater than 6 CPH using a period of 24 hours (diurnal) and the first harmonic of 12 hours (semidiurnal).
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