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Neste trabalho e apresentado um modelo semi-empirico de ventos neutros termosfericos medios longitudinais para periodos de baixas atividades solar e geomagnetica com dependencia em hora local, dia do ano e latitude geografica para 250 km de altitude. O modelo e denominado de SEATWIM (sigla em ingles para Semi Empirical Averaged Termospheric Wind Model ) valido para periodos de baixa atividade solar e geomagnetica. O SEATWIM foi construido a partir de uma analise estatistica dos dados observados in situ obtidos pelo satelite UARS ( Upper Atmosphere Research Satllite ) por meio da carga util WINDII ( Wind Imaging Interferometer ), onde os valores representativos para 250 km sao obtidos pela media integrada em altitude entre 205 km e 275 km, e, a partir de uma analise estatistico-espectral, foi extraido comportamento diario e sazonal distribuidos em latitude geografica. O modelo proposto exibe uma boa concordância em relacao a climatologia dos dados observados pelo satelite para as componentes zonal e meridional dos ventos neutros termosferico em distintos periodos. Quando comparado ao comportamento dos dados observados, os indices estatisticos exibiram bons resultados, sendo os melhores resultados obtidos nos periodos de equinocio em ambas as componentes do vento termosferico. A validacao estatistica tambem exibiu melhores resultados para a componente zonal em comparacao a componente meridional, para todos os periodos do ano. Os testes estatisticos utilizados indicam que o modelo SEATWIM assemelha-se ao modelo HWM14 ( Horizontal Wind Model , versao 2014) principalmente em relacao a componente zonal. Semi Empirical Longitudinal Averaged Termospheric Wind Model at 250 km for Solar and Geomagnectic Activities Quiet Time A B S T R A C T This paper presents a semi empirical model of averaged longitudinal thermospheric neutral wind for quiet time periods of solar and geomagnetic activities with dependence on local time, day of the year and geographical latitude for 250 km of altitude, which was called SEATWIM (Semi Empirical Averaged Thermospheric Winds Model, the letter Q means quiet time of solar and magnectic activities). The SEATWIM was constructed from a statistical analysis of the observed in situ data obtained by the UARS satellite (Upper Atmosphere Research Satllite) through the WINDII payload equipment, where the representative values for 250 km are obtained by the average value integrated in altitude between 205 km and 275 km, and, from a statistical and spectral analysis, we extracted daily and seasonal behavior distributed over geographic latitude. The proposed model shows a good agreement with the climatology of the data observed by the satellite for the thermospheric neutral wind zonal and meridional directions. The statistical indices showed good results when compared to the behavior of the observed data being the best results obtained in the equinox periods in both thermospheric wind directions. Statistical validation also showed better results for the zonal component in comparison with the meridional component for all periods of the year. Statistical tests also indicate that the SEATWIM is similar to the HWM14 (Horizontal Wind Model, version 2014), mainly in the zonal direction. key-words: Computational simulation, termospheric neutral wind, SEATWIM

Modelo Semi-Empírico Médio Longitudinal de Ventos Termosféricos a 250 km para Períodos de Baixa Atividade Solar e Geomagnética