@Article{PaulinoArPaWrBaBa:2020:VaLuSe,
               author = "Paulino, Ana Roberta da Silva and Ara{\'u}jo, Fabiano da Silva 
                         and Paulino, Igo and Wrasse, Cristiano Max and Batista, Paulo 
                         Prado and Batista, Inez Staciarini",
          affiliation = "{Universidade Estadual da Para{\'{\i}}ba (UEPB)} and 
                         {Universidade Estadual da Para{\'{\i}}ba (UEPB)} and 
                         {Universidade Federal de Campina Grande (UFCG)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Variability of the lunar semidiurnal tidal amplitudes in the 
                         ionosphere over Brazil",
              journal = "Annales Geophysicae Discussions",
                 year = "2020",
               volume = "2020",
                pages = "1--20",
                 note = "Setores de Atividade: Pesquisa e desenvolvimento 
                         cient{\'{\i}}fico, Educa{\c{c}}{\~a}o.",
             keywords = "Lunar Tides, TEC, ionosphere.",
             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 intraseasonal (\∼120 
                         days) oscillations were the second and third components, 
                         respectively, but they presented significant temporal 5 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 10 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.",
                 issn = "0992-7689",
                label = "lattes: 2306964700488382 5 PaulinoArPaWrBaBa:2020:VaLuSe",
             language = "pt",
           targetfile = "paulino_variability.pdf",
        urlaccessdate = "28 abr. 2024"
}