author = "Carvalho, A. J. A. and Paulino, I. and Medeiros, A. F. and Lima, 
                         L. M. and Buriti, R. A. and Paulino, A. R. and Wrasse, Cristiano 
                         Max and Takahashi, Hisao",
          affiliation = "{Universidade Federal de Pernambuco (UFPE)} and {Universidade 
                         Federal de Campina Grande (UFCG)} and {Universidade Federal de 
                         Campina Grande (UFCG)} and {Universidade Estadual da 
                         Para{\'{\i}}ba (UEPB)} and {Universidade Federal de Campina 
                         Grande (UFCG)} and {Universidade Federal de Campina Grande (UFCG)} 
                         and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Case study of convective instability observed in airglow images 
                         over the Northeast of Brazil",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2017",
               volume = "154",
                pages = "33--42",
                month = "Feb.",
             keywords = "Airglow images, Convective instability, Gravity wave, Mesospheric 
                         inversion layer, SABER measurements.",
             abstract = "An intense activity of ripples during the nighttime was observed 
                         in airglow images over S{\~a}o Jo{\~a}o do Cariri (36.5 W, 7.4 
                         S) on 10 October 2004 which lasted for two hours. Those ripples 
                         appeared simultaneously with the crossing of a mesospheric front 
                         and medium scale gravity waves. The ripples occurred ahead of the 
                         mesospheric front and their phase front were almost parallel to 
                         the phase of the mesospheric front and were almost perpendicular 
                         to the phase front of the gravity wave. Using wind measurements 
                         from a meteor radar located at S{\~a}o Jo{\~a}o do Cariri and 
                         simultaneous vertical temperature profiles from the TIMED/SABER 
                         satellite, on the night of the events and within the imager field 
                         of view, the atmospheric background environment in the mesosphere 
                         and lower thermosphere (MLT) was investigated in order to 
                         understand the instability process that caused the appearance of 
                         the ripples. Dynamic and convective instabilities have been 
                         pointed out as responsible for creation of ripples in the MLT. The 
                         observed ripples were advected by the neutral wind, they occurred 
                         into a region with negative lapse rate of the potential 
                         temperature and the Richardson number was negative as well. 
                         According to these characteristics, the ripple structures could be 
                         generated in the MLT region due to the predominance of convective 
                  doi = "10.1016/j.jastp.2016.12.003",
                  url = "http://dx.doi.org/10.1016/j.jastp.2016.12.003",
                 issn = "1364-6826",
             language = "en",
           targetfile = "carvalho_case.pdf",
        urlaccessdate = "04 dez. 2020"