@InProceedings{FagundesBageAbalBati:2012:ObGrWa,
               author = "Fagundes, Paulo R. and Bageston, Jos{\'e} Valenin and Abalde, 
                         Jos{\'e} Ricardo and Batista, Paulo Prado",
          affiliation = "{Universidade do Vale do Para{\'{\i}}ba (UNIVAP)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade do Vale 
                         do Para{\'{\i}}ba (UNIVAP)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Observed gravity wave-gravity wave interaction at mesospheric 
                         heights",
            booktitle = "Abstracts...",
                 year = "2012",
         organization = "International Symposium on Equatorial Aeronomy, 13. (ISEA).",
             abstract = "This study presents and discuss two simultaneous mesospheric 
                         fronts observed through the OH nightglow emission, using an 
                         all-sky imaging system at Palmas (10.2° S, 48.2° W), Brazil. On 
                         May 29-30, 2008, an uncommon event of gravity-wave was observed 
                         and identified as an interaction between two mesospheric 
                         gravity-wave type fronts. After the two waves cross each other in 
                         almost opposite direction, a great depletion in the OH emission 
                         rate was observed between these fronts. The two wave fronts 
                         extended throughout the north-south extension and propagated in 
                         southwest and northeast direction, respectively. In fact, the 
                         gravity-waves moved in almost the opposite directions, and when 
                         they crossed each other during their passage, a region between the 
                         wave fronts showed a band of airglow depletion. The airglow 
                         depletion between the two fronts became wider as the waves moved 
                         away from each other. The two mesospheric fronts showed distinct 
                         horizontal wavelengths and periods, but very similar observed 
                         phase speed. In addition, meridional and zonal wind components 
                         were obtained by a meteor radar operated in Sao Joao do Cariri 
                         (7.4°S, 36.5°W), Brazil, and temperature observations from the 
                         TIMED/SABER satellite were used together with the wind 
                         measurements to characterize the vertical propagation 
                         characteristics of the observed waves. The large airglow depletion 
                         seen between the two fronts after the wave-wave interaction is a 
                         puzzle, but could be explained by photochemistry models forced by 
                         dynamics. Essentially, the observed OH emission depletion will 
                         depend on the photochemistry that forms the excited OH and on the 
                         local temperature.",
  conference-location = "Paracas, Peru",
      conference-year = "Mar., 12-15, 2012",
           targetfile = "fagundes_observed.pdf",
        urlaccessdate = "20 maio 2024"
}