@Article{EgitoBatTakBatBur:2020:VaEqIo,
               author = "Egito, F{\'a}bio and Batista, Inez Staciarini and Takahashi, 
                         Hisao and Batista, Paulo Prado and Buriti, R. A.",
          affiliation = "{Universidade Federal do Rec{\^o}ncavo da Bahia (UFRB)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Universidade Federal de Campina 
                         Grande (UFCG)}",
                title = "Variability of the equatorial ionosphere induced by nonlinear 
                         interaction between an ultrafast Kelvin wave and the diurnal 
                         tide",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2020",
               volume = "208",
                pages = "e105397",
                month = "Oct.",
             keywords = "Ultrafast Kelvin wave and tides, Nonlinear interaction, Secondary 
                         waves, Ionosphere.",
             abstract = "The wave forcing from below allows the neutral atmosphere to drive 
                         short-term variability in the ionosphere. Recent modeling studies 
                         have shown that secondary waves originated from the nonlinear 
                         interaction of the atmospheric tides with planetary scale waves 
                         can contribute significantly to day-to-day variability of the 
                         ionosphere. In this study we used MLT neutral wind measured at S~ 
                         ao Jo~ ao do Cariri (7.4\�S, 36.5\�W) and 
                         ionospheric soundings performed by a digisonde installed at 
                         Fortaleza (3.9\�S, 38.4\�W) to investigate the 
                         presence and the induced variability by a secondary wave in the 
                         mesosphere-ionosphere system over the Brazilian equatorial region. 
                         We found evidences of the nonlinear interaction between a 3.5-day 
                         ultrafast Kelvin wave and the diurnal tide. The interaction 
                         produced a 1.3-day secondary wave that was found to propagate 
                         upward with maximum amplitude of 15 m/s and relatively long 
                         vertical wavelength (~44 km) in the MLT, which may allow it to 
                         penetrate into the ionosphere. In the ionosphere, we observed a 
                         common 1.3-day periodic variation in the virtual height (hF) and 
                         critical frequency (foF2), which may be connected to the secondary 
                         wave observed in the MLT via modulation of the wind system in the 
                         E region dynamo. These findings suggest that secondary waves may 
                         impose additional variability to ionosphere.",
                  doi = "10.1016/j.jastp.2020.105397",
                  url = "http://dx.doi.org/10.1016/j.jastp.2020.105397",
                 issn = "1364-6826",
             language = "en",
           targetfile = "egito_variability.pdf",
        urlaccessdate = "18 abr. 2024"
}