Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1081j&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1081-1090.
Physics
20
Incoherent Scatter Radar, Magnetosphere-Ionosphere Coupling, Meridional Flow, Radar Tracking, Thermosphere, E Region, F Region, Greenland, Ionospheric Electron Density, Ionospheric Ion Density, Upper Atmosphere
Scientific paper
The incoherent scatter radar located at Sondre Stromfjord (Greenland) obtained E and F region measurements during the first Lower Thermosphere Coupling Study (LTCS 1), September 21-26, 1987. Lower thermospheric neutral winds deduced from these measurements show that the neutral dynamics are influenced by both tidal oscillations and magnetospheric forcing. During an interval which was relatively quiet geomagnetically, September 23-24, a semidiurnal oscillation dominated the neutral motion. The model equinox tidal amplitudes and phases of Forbes (1982) for the diurnal tide are roughly in agreement with the observed diurnal oscillation for the first four days of the experiment. Vertical variations in the observed diurnal phases are consistent with the results of Forbes and Hagan (1988) and may provide evidence of dissipation of the propagating (1, 1) tidal mode. The semidiurnal motion observed during this period is not well represented by the recent theoretical results for the amplitude and phase of the semidiurnal tide (Forbes and Vial, 1991). Neutral winds obtained during a geomagnetically active interval, September 25-26, displayed a flow pattern that was significantly distorted from that observed during the preceding, relatively quiet interval.
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