High-latitude lower thermospheric neutral winds at EISCAT and Sondrestrom during LTCS 1

Details High-latitude lower thermospheric neutral winds at EISCAT and Sondrestrom during LTCS 1 High-latitude lower thermospheric neutral winds at EISCAT and Sondrestrom during LTCS 1

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1099j&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1099-1116. Research supported by SERC.

Physics

33

Eiscat Radar System (Europe), Incoherent Scatter Radar, Thermosphere, Wind Profiles, Atmospheric Tides, E Region, F Region, Greenland, Polar Regions

Scientific paper

The incoherent scatter radar located at Sondre Stromfjord, Greenland and the EISCAT incoherent scatter facility located in northern Scandinavia both obtained E and F region measurements during the first campaign of the Lower Thermosphere Coupling Study (LTCS 1, September 21-25, 1987). Neutral winds deduced from these measurements have been analyzed for their mean flow and tidal components. A number of the altitude profiles for the mean winds and the diurnal and semidiurnal wave components at the two radar locations show similar variations with height, indicating that latitudinal rather than longitudinal effects are dominant in determining the observed wind field. Diurnal tidal amplitudes and phases are reasonably well represented by theoretical model results (Forbe, 1982). The semidiurnal amplitude and phases are not well represented in equinox tidal model results (Forbes and Vial, 1991). Results from both radars indicate a vertical wavelength for the zonal semidiurnal oscillation of approximately 60 km. Comparison with the results of a NCAR thermosphere-ionosphere general circulation model simulation of the LTCS 1 interval shows generally better agreement with the observations at EISCAT than at Sondrestrom.

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