Wave disturbances of electron density in ionospheric f2 layer: seasonal-diurnal variations

Abstract

Regular and quasiperiodic seasonal and diurnal variations of electron density N, in ionospheric F2-layer in growth of solar activity (2011) are analyzed. Short-time Fourier transform, adaptive Fourier transform and wavelet transform were applied to the system spectral analysis. During all seasons, a prevailing oscillation with the period of 140-200 min, amplitude N_a(0.2-2)10₁₁ м^-3, relative amplitude had been shown in ionospheric F2-layer. Duration of this oscillation, depending on the season, varied within 5-7 to 24 h. The amplitude of fluctuations with other periods was noticeably smaller.