Long-term thermospheric neutral wind observations over the northern polar cap

Details Long-term thermospheric neutral wind observations over the northern polar cap Long-term thermospheric neutral wind observations over the northern polar cap

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jastp..70.2014w&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 70, Issue 16, p. 2014-2030.

Physics

1

Thermospheric Dynamics, Polar Cap, Fabry-Perot Interferometer, Solar Effect

Scientific paper

We study the solar dependence of the thermospheric dynamics based on more than 20 years Fabry-Perot interferometer O 6300 Å emission observation of polar cap thermospheric wind from three stations: Thule (76.53°N, 68.73°W, MLAT 86N), Eureka (80.06°N, 86.4°W, MLAT 89N), and Resolute (74.72°N, 94.98°W, MLAT 84N) in combination with the National Center for Atmospheric Research Thermosphere Ionosphere Electrodynamics General Circulation Model (NCAR-TIEGCM). All three stations showed a dominant diurnal oscillation in both the meridional and zonal components, which is a manifestation of anti-sunward thermospheric wind in the polar cap. The three-station observations and the TIEGCM simulation exhibit varying degree of correlations between the anti-sunward thermospheric wind and solar F10.7 index. The diurnal oscillation is stronger at Eureka (~150 m/s) than that at Resolute (~100 m/s) according to both observations and TIEGCM simulation. The semidiurnal oscillation is stronger at Resolute (~20 m/s) than that at Eureka based (~10 m/s) on data and model results. These results are consistent with a two-cell convection pattern in the polar cap thermospheric winds. The Thule results are less consistent between the model and observations. The simulated meridional wind diurnal and semidiurnal oscillations are stronger than those observed.

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