author = "Giongo, Gabriel Augusto and Bageston, Jos{\'e} Valentin and 
                         Batista, Paulo Prado and Wrasse, Cristiano Max and Bittencourt, 
                         Gabriela Dornelles and Paulino, Igo and Leme, Neusa Maria Paes and 
                         Fritts, David C. and Janches, Diego and Hocking, Wayne and Schuch, 
                         Nelson Jorge",
          affiliation = "{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 {Universidade Federal de Santa Maria (UFSM)} 
                         and {Universidade Federal de Campina Grande (UFCG)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Boulder GATS} and 
                         {National Aeronautics and Space Administration (NASA)} and 
                         {University of Western Ontario} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Mesospheric front observations by the OH airglow imager carried 
                         out at Ferraz Station on King George Island, Antarctic Peninsula, 
                         in 2011",
              journal = "Annales Geophysicae",
                 year = "2018",
               volume = "36",
               number = "1",
                pages = "253--264",
                month = "Feb.",
             keywords = "Atmospheric composition and structure (air-glow and aurora), 
                         meteorology and atmospheric dynamics (middle atmosphere dynamics 
                         waves and tides).",
             abstract = "The main goals of this work are to characterize and investigate 
                         the potential wave sources of four mesospheric fronts identified 
                         in the hydroxyl near-infrared (OH-NIR) air-glow images, obtained 
                         with an all-sky airglow imager installed at Comandante Ferraz 
                         Antarctic Station (EACF, as per its Portuguese acronym) located on 
                         King George Island in the Antarctic Peninsula. We identified and 
                         analyzed four mesospheric fronts in 2011 over King George Island. 
                         In addition, we investigate the atmospheric background environment 
                         between 80 and 100 km altitude and discuss the ducts and 
                         propagation conditions for these waves. For that, we used wind 
                         data obtained from a meteor radar operated at EACF and temperature 
                         data obtained from the TIMED/SABER satellite. The vertical 
                         wavenumber squared, m(2), was calculated for each of the four 
                         waves. Even though no clearly defined duct (indicated by positive 
                         values of m(2) sandwiched between layers above and below with m(2) 
                         < 0) was found in any of the events, favorable propagation 
                         conditions for horizontal propagation of the fronts were found in 
                         three cases. In the fourth case, the wave front did not find any 
                         duct support and it appeared to dissipate near the zenith, 
                         transferring energy and momentum to the medium and, consequently, 
                         accelerating the wind in the wave propagation direction (near to 
                         south) above the OH peak (88-92 km). The likely wave sources for 
                         these four cases were investigated by using meteorological 
                         satellite images and in two cases we could find that strong 
                         instabilities were potential sources, i.e., a cyclonic activity 
                         and a large convective cloud cell. In the other two cases it was 
                         not possible to associate troposphere sources as potential 
                         candidates for the generation of such wave fronts observed in the 
                         mesosphere and secondary wave sources were attributed to these 
                  doi = "10.5194/angeo-36-253-2018",
                  url = "http://dx.doi.org/10.5194/angeo-36-253-2018",
                 issn = "0992-7689",
             language = "en",
           targetfile = "giongo_mesospheric.pdf",
        urlaccessdate = "14 maio 2021"