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%0 Journal Article
%4 sid.inpe.br/iris@1905/2005/07.29.22.16
%2 sid.inpe.br/iris@1905/2005/07.29.22.16.12
%@issn 0032-0633
%F 8760
%T Observations of thermospheric neutral winds at 23 deg.S
%D 1992
%A Sahai, Yogeshwar,
%A Takahashi, Hisao,
%A Fagundes, Paulo Roberto,
%A Clemesha, Barclay Robert,
%A Teixeira, Nelson Rodrigues,
%B Planetary and Space Science
%V 40
%N 6
%P 767-773
%K AERONOMIA, TERMOSFERA, INTERFFEROMETRO FABRY-PEROT, LUMINESCENCIA, eMISSOES oi 630.0.
%X Observations of night-time thermospheric neutral wind velocities from measurements of Doppler shifts of the 0I 630.0 nm airglow emission line, using a Fabry-Perot interferometer, have been carried out from 23 degree S geographic latitude in the Brazilian setor during We period March 1988-December 1989. The observing location is situated inside both the equatorial ionospheric and South Atlantic magnetic anomalies. In this paper we present and discuss salient features of the average nocturnal variations of the thermospheric meridional and zonal wind velocities during autumn, winter, spring and slimmer seasons. The results are compared with the wind velocities predicted by the HWM-87 and HWM-90 models. The observed and predicted meridional and zonal wind velocities from the HWM-87 and HWM-90 models show a reasonable agreement in terms of tendencies of nocturnal variations during different seasons. However, some discrepancies arc observed with regard to the magnitudes and detailed variation in the nocturnal patterns. The observed zonal winds are stronger than the meridional winds. Also the summer zonal winds are stronger than in winter, contrary to the HWM-87 model predictions. The observed thermospherie wind velocities, presented here, are comparable with those report from other low latitude stations.
%3 7469.pdf


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