Comparison of plasma flow and thermospheric circulation over northern Scandinavia using EISCAT and a Fabry-Perot interferometer

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Arctic Regions, Atmospheric Circulation, Eiscat Radar System (Europe), Ionospheric Sounding, Space Plasmas, Thermosphere, Atmospheric Temperature, Fabry-Perot Interferometers, Scandinavia, Time Response, Winds Aloft

Scientific paper

EISCAT observations of ionospheric plasma drift obtained during 24 h on November 25-26, 1982, are compared with thermospheric-wind measurements obtained with a Fabry-Perot interferometer (FPI) at Kiruna, Sweden, during the hours of darkness (14-05 h UT). The data are presented in graphs, tables, and color diagrams and characterized in detail. The EISCAT-derived meridional-wind estimates for 312 km are found to agree to within 50 m/s with the FPI data; the zonal winds are about 50 percent faster than the FPI winds, exhibiting parallel fluctuations except after increases in neutral and ion temperatures. The differences are attributed to altitude gradients in the temperature data.

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