Application of the Singular Spectrum Analysis to the time variations of the amplitude of Schumann resonance measurements

摘要

The Singular Spectrum Analysis technique has been applied to the amplitude of the first Schumann resonance measured at the Sierra Nevada station (Spain) in order to obtain the principal components of its time evolution. The results of this study confirm the appearance of the annual and semiannual components that have been pointed out for this resonance and also reveal other components corresponding to 45 to 120 days variations, which matches the variations of athmospheric waves like the Madden-Julian oscillation and the Kelvin waves. A preprocessing of the measurements is required since the station has experienced some technical failures and there are thus some gaps in the measured data. The application of the technique has been made taking one data per month and one data per day, and the results have been compared.