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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-134
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-134
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 27 Nov 2019

Submitted as: regular paper | 27 Nov 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Diurnal mesospheric tidal winds observed simultaneously by meteor radar in Costa Rica (10° N, 86° W) and Cariri (7° S, 37° W)

Ricardo A. Buriti1, Wayne Hocking2, Paulo P. Batista3, Igo Paulino1, Ana R. Paulino4, Marcial Garbanzo-Salas5, Barclay Clemesha3,†, and Amauri F. Medeiros1 Ricardo A. Buriti et al.
  • 1Unidade Acadêmica de Física, Universidade Federal de Campina Grande, C. Grande, 58429-900, Brazil
  • 2Department of Physics and Astronomy, University of Western Ontario, London, N6A3K7, Canada
  • 3Instituto Nacional de Pesquisas Espaciais, S. J. dos Campos, 12227-010, Brazil
  • 4Departamento de Física, Universidade Estadual da Paraíba, C. Grande, 58429-500, Brasil
  • 5Departament of Atmospheric, Oceanic and Planetary Physics, Universidad of Costa Rica, San Jose, 11501-2060, Costa Rica
  • deceased

Abstract. This paper is about a study of diurnal tides on meteor wind observed simultaneously by two meteor radars sited on equatorial region. The radar are located in Santa Cruz (10.3° N, 85.6° W), Costa Rica (hereafter CR) and in São João do Cariri (7.4° S, 36.5° W), Brazil (hereafter CA). The distance between them is 5800 km. Harmonic analysis was used to get information of amplitude and phase (hour of peak amplitude) of diurnal, semidiurnal and terdiurnal tides between 82 and 98 km of height. The period of observation was from April 2005 to January 2006. The results were compared to GSWM00 model. In general, seasonal agreement between observation and model was satisfactory to zonal and meridional amplitudes. Values of zonal and meridional amplitudes from November to January to CR were very different of GSWM00. Peak of zonal amplitude (~ 25 m/s) to CR was observed in September and December between 90 and 94 km. On the other hand, meridional phase was excellent to both sites and vertical wavelength of 25 km was observed practically every month to CR and CA. The zonal phase presented some difficult to get vertical wavelength according to criteria adopted to calculate it. Considering diurnal zonal amplitude, when we compare CR and CA, we could expect a poor agreement of amplitude between them. That is normal if we believe that this is because the geographical location of both sites are completely different in terms of local climate even if they are close to the equator and effect of heat latent release could lead to different response at high altitudes.

Ricardo A. Buriti et al.
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Short summary
Solar atmospheric tides are natural oscillations of 24, 12, 8... hours that contribute to the circulation of the atmosphere from low to high altitudes. Sun heats the atmosphere periodically because, mainly, water vapor and ozone absorb solar radiation between ground and 50 km height during the day. Tides propagate upward and they can be observed in, e.g., wind field. This work presents diurnal tides observed by meteor radar which measure wind between 80 and 100 km height.
Solar atmospheric tides are natural oscillations of 24, 12, 8... hours that contribute to the...
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