The analysis of diurnal and subdiurnal oscillations is used to study convection processes in the upper atmosphere. Standard methods of such analysis, the Fourier transform, produces significant noise level and calculation artifacts in the resulting data. The paper presents the first results of parametric spectral analysis of diurnal and subdiurnal oscillations in parameters measured by mid-latitude SuperDARN and SEKIRA radars. The method is based on parametric spectrum estimation using an ARIMA regression model and produces significantly fewer artifacts. The efficiency of this method is demonstrated. A preliminary analysis of the seasonal and spatial variability of the detected modes with periods from 24 to 4 hours has been carried out.
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