Lower-thermospheric winds at high latitude - Chatanika radar observations

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Atmospheric Tides, E Region, Geomagnetism, Incoherent Scatter Radar, Thermosphere, Wind Velocity, Atmospheric Circulation, Diurnal Variations, Ionospheric Drift

Scientific paper

Observations made of the high-latitude E-region with the Chatanika, Alaska (65 deg N), incoherent scatter radar facility during the summer months of 1976 to 1982 are presented. Fourteen 24-h experiments were performed with altitude resolution between 9 and 24 km. Ion drifts measured during these experiments have been analyzed to obtain neutral winds at lower-thermospheric heights. Tidal oscillations are the predominant feature of the neutral winds from 90 to 125 km. The semidiurnal oscillation is particularly strong, attaining peak amplitudes of 50 m/s at 110 km. Average neutral winds are determined for three different levels of geomagnetic activity. During geomagnetically active experiments, the average neutral wind circulation pattern was altered from its normal quiet-time behavior above 100 km.

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