Seasonal-latitudinal structure of the diurnal thermospheric tide

Computer Science

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Annual Variations, Atmospheric Tides, Diurnal Variations, F Region, Solar Activity Effects, Thermosphere, Far Ultraviolet Radiation, Nitrogen, Oxygen Atoms, Solar Cycles, Spatial Dependencies, Sunspots, Temperature Profiles, Viscous Flow

Scientific paper

The linearized tidal equations for a spherical rotating viscous atmosphere characterized by anisotropic ion drag are integrated numerically to determine the seasonal-latitudinal variability of the diurnal thermospheric tide for minimum and maximum levels of solar activity. Variations in F-region ionospheric structure and the solar zenith angle dependence of the EUV heat source are major factors controlling the seasonal-latitudinal structure of the diurnal thermospheric tide. The combined interaction of the solar-cycle dependent background temperature profile and the variations in the seasonal structure of the ionospheric plasma with sunspot activity results in a solar-cycle variation of the seasonal-latitudinal morphology of the diurnal tide. Calculation of diurnal oscillations in O and N2 are given which reveal a complex dependence of tidal effects on height, latitude, season, and solar activity.

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