Seasonal variations of lower thermospheric winds from the Millstone Hill incoherent scatter radar

Details Seasonal variations of lower thermospheric winds from the Millstone Hill incoherent scatter radar Seasonal variations of lower thermospheric winds from the Millstone Hill incoherent scatter radar

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9227w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Nov. 1, 1983, p. 9227-9241.

Physics

18

Atmospheric Tides, Incoherent Scatter Radar, Thermosphere, Wind Measurement, Annual Variations, E Region, F Region

Scientific paper

Steerable (L band) and fixed (UHF) radars were used in making regular incoherent scatter observations of E and F region ion drifts between July 1976 and November 1977. The semidiurnal winds typically grew in amplitude, reaching a maximum in the vicinity of 125 km and having larger values at the equinoxes than the solstices. The wind field at 105 km exhibited a significant polarization, with southward and wind amplitudes larger than eastward amplitudes. It is noted that the seasonal variations in tidal phase were generally less than one hour. For the in situ tidal component, the amplitude and phase of the measured diurnal wind were in reasonable agreement with theoretical expectations, and there was no indication of the presence of an upward propagating diurnal component. However, the measured semidiurnal winds were consistent with being the result of the upward propagation of tidal energy from below 100 km rather than in situ tidal excitation. No definite mode identification is obtained from attempts to match the measured vertical wind structure with that expected for the different semidiurnal Hough mode extensions in the lower thermosphere.

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