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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/angeo-2020-34
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2020-34
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 26 May 2020

Submitted as: regular paper | 26 May 2020

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This preprint is currently under review for the journal ANGEO.

Variability of the lunar semidiurnal tidal amplitudes in the ionosphere over Brazil

Ana Roberta Paulino1, Fabiano da Silva Araújo1, Igo Paulino2, Cristiano Max Wrasse3, Lourivaldo Mota Lima1, Paulo Prado Batista3, and Inez Staciarini Batista3 Ana Roberta Paulino et al.
  • 1Departamento de Física, Universidade Estadual da Paraíba, Campina Grande, Brazil
  • 2Unidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande, Brazil
  • 3Divisão de Aeronomia, Instituto Nacional de Pesquisas Espaciais, São José dos Campos, Brazil

Abstract. The variability in the amplitudes of the lunar semidiurnal tide was investigated using maps of Total Electron Content over Brazil from January 2011 to December 2014. Long period variability showed that the annual variation is always present in all investigated magnetic latitudes and it represents the main component of the temporal variability. Semiannual and intra-seasonal (~ 120 days) oscillations were the second and third components, respectively, but they presented significant temporal and spatial variation without a well-defined pattern. Among the short period oscillations in the amplitude of the lunar tide, the most pronounced ones were concentrated between 7–11 days. These oscillations were stronger around the equinoxes, in special between September and November in almost all latitudes. In some years, as in 2013 and 2014, for instance, they appeared with large power spectral density in the winter hemisphere. There was also observed evidence of antisymetry in the amplitudes maxima and minima of the 7–11 days oscillation with respect to the magnetic equator. These characteristics are compatible with normal mode westward propagating quasi 10 days planetary wave with horizontal wavenumber equal to 1. Besides, using data from a meteor radar located at low latitudes in Brazil for November 2013, when the amplitude of the 7–11 days oscillation was strong, it was possible to identify the presence of quasi 10 days oscillation in the both zonal and meridional component of the horizontal winds. These results suggest a possible coupling process by modulation of the lunar semidiurnal tidal amplitudes that allows the propagation of the 7–11 days waves into the thermosphere-ionosphere system.

Ana Roberta Paulino et al.

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Ana Roberta Paulino et al.

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Latest update: 13 Jul 2020
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Short summary
Long and short period oscillations in the lunar semidiurnal tidal amplitudes in the ionosphere derived from the total electron content were investigated over Brazil from 2011 to 2014. The results showed  annual, semiannual and intra-seasonal as the dominant components. Additionally, The most pronounced short period oscillation was the 7–11 days which presented characteristics compatible with the quasi 10 days planetary wave, suggesting a possible coupling process from the lower atmosphere.
Long and short period oscillations in the lunar semidiurnal tidal amplitudes in the ionosphere...
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