Neutral winds in the thermosphere at mid-latitudes over a full solar cycle - A tidal decomposition

Physics

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Atmospheric Tides, F 2 Region, Solar Cycles, Thermosphere, Wind Variations, Electric Fields, Fourier Series, Geomagnetism, Ionosondes

Scientific paper

In a continuation of Buonsanto's (1990) study, thermospheric neutral winds at the F2 peak were calculated from ionosonde data for the full solar cycle (July 1975 - June 1986) at a second midlatitude station, Boulder (Colorado), and at quiet to moderate geomagnetic conditions, permitting a Fourier decomposition of the mean daily variation to be performed for each month as a function of local time. The dynamo electric fields were taken into account by including the electric field model of Richmond et al. (1980) in the servo model wind calculations. The results revealed significant components with wave periods of 24, 12, 8, and 6 hrs. Results on variations or amplitudes and phase maxima of wind waves are consistent with current models of atmospheric tides.

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