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acoustic-gravity waves AE-index AGWs altitude amplitude of TIDs approximation auroral average azimuth background baseline Brunt-Vaisala period component constant daily variation daytime differential Doppler shift differential Doppler technique Dong and Yeh Doppler shift east-west eastward electrojets electron density equation equatorward excitation figure filtering frequency of occurrence geomagnetic field golven gravity waves horizontal phase velocity horizontal wavelength hour indicated interaction ionospheric point J.Atmos.Terr.Phys J.Geophys.Res jet stream Joule heating Kelder latitude latitudinal Leitinger line-of-sight longitude maximum mean ionosphere height mid-latitude MSTIDs Nangay neutral wind night-time NmF2 NNSS-satellite observed occurrence of TIDs orbital parameters period of TIDs perturbation phase velocity plasmasphere primary wave radio interferometry Radioheliograph refractive index satellite pass secondary gravity waves secondary waves signals smaller solar cycle solar terminator southward Spoelstra stations thermosphere total electron content travelling ionospheric disturbances tropospheric trough values vertical wave number wave patterns wave vector winter WSRT zenith angle