@InProceedings{BilibioPWVFANSTEL:2024:StPrMe,
               author = "Bilibio, Anderson Vestena and Paulino, Igo and Wrasse, Cristiano 
                         Max and Vital, Luiz Fillip R. and Figueiredo, Cosme Alexandre 
                         Oliveira Barros and Ayorinde, Toyese Tunde and Nyassor, Prosper 
                         Kwamla and Silva, Diego Barros and Takahashi, Hisao and Essien, 
                         Patrick and Lomotey, Solomon Otto",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Study on the propagation of medium scale gravity waves",
            booktitle = "Proceedings...",
                 year = "2024",
         organization = "Conferencia Latinoamericana de Geof{\'{\i}}sica Espacial, 14.",
             abstract = "This study medium-scale gravity waves were investigated using more 
                         than one airglow layer. The observations were conducted of 
                         S{\~a}o Jo{\~a}o do Cariri (7.4°S; 36.5°W) from 1998 to 2013. A 
                         wave analysis technique was used that involved creating keograms 
                         in the direction of propagation of the gravity wave and 
                         determining the phase propagation of the waves through multiple 
                         airglow layers. This approach made it possible to investigate the 
                         vertical and horizontal parameters (period, wavelength and phase 
                         speed) of medium-scale gravity waves. A total of 38 wave events 
                         were investigated. The periods covered a range of 40 to 80 min, 
                         with the majority of horizontal wavelengths lying between 140 and 
                         290 km, while the horizontal phase velocity predominantly varied 
                         from 50 to 80 m/s. The vertical wavelengths were concentrated in 
                         the range of 70 to 280 km, and the vertical phase velocities 
                         between 20 and 50 m/s. Furthermore, the analysis of the vertical 
                         phase allowed us to infer that 66% of the waves demonstrated 
                         upward phase propagation, indicating a decrease in energy. These 
                         results suggested that many of the sources of this gravity wave 
                         spectrum could be above the airglow layers and/or there are 
                         expressive conditions to create turn levels in the lower 
                         thermosphere, which could produce reflection of the gravity waves 
                         and increase the number of the gravity waves propagating 
                         downward.",
  conference-location = "Monterrey, Mexico",
      conference-year = "08-12 Apr. 2024",
             language = "en",
        urlaccessdate = "01 maio 2024"
}