author = "Lima, Lourivaldo M. and Batista, Paulo Prado and Paulino, Ana 
          affiliation = "{Universidade Estadual da Para{\'{\i}}ba (UEPB)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Universidade Estadual 
                         da Para{\'{\i}}ba (UEPB)}",
                title = "Meteor radar temperatures over the brazilian low-latitude 
              journal = "Journal of Geophysical Research: Space Physics",
                 year = "2018",
               volume = "123",
               number = "9",
                pages = "7755--7766",
                month = "Sept.",
             keywords = "mesopause temperature, meteor radar, atmospheric dynamics.",
             abstract = "Meteor radar observations have been used to estimate the 
                         mesospheric temperatures at 90-km height over the Brazilian 
                         low-latitude sectors by applying gradient- and pressure-based 
                         techniques. The measurements have been taken from meteor radars 
                         operating at Cachoeira Paulista (22.7 degrees S, 45 degrees W), 
                         from 2002 to 2006, and SAo JoAo do Cariri (7.4 degrees S, 36.5 
                         degrees W), between mid-2004 and 2008. The temperatures estimated 
                         from meteor data by the two techniques, using local models for 
                         temperature gradient and pressure, showed a good agreement with 
                         temperatures from Sounding of the Atmosphere by Broadband Emission 
                         Radiometry over both sites. The seasonal behavior of the 
                         temperatures estimated from meteor data, and from Sounding of the 
                         Atmosphere by Broadband Emission Radiometry instrument, is 
                         characterized by a semiannual oscillation (SAO) with maximum 
                         values during equinoxes, which coincide with the westward phase of 
                         the mean zonal wind as well as with SAO on diurnal tidal 
                         amplitudes over both sites. The lag phases between SAO on 
                         temperatures and on winds (or on diurnal tidal amplitudes), near 
                         equator, have been stable in time indicating a seasonal cycle and 
                         the dynamic coupling of the tropical mesosphere through nonlinear 
                         interactions between oscillations from stratosphere. Although the 
                         time series used are short to establish reliable trends or solar 
                         effects, the temperatures over Cachoeira Paulista showed a 
                         decrease between 2003 and 2006, just when F10.7 index has declined 
                         in a rate of 15.3sfu/year, while over SAo JoAo do Cariri only a 
                         slight decay has been observed on temperatures by gradient 
                         technique obtained from mid-2004 to 2008, when F10.7 decrease rate 
                         was 9.2 sfu/year.",
                  doi = "10.1029/2018JA025620",
                  url = "http://dx.doi.org/10.1029/2018JA025620",
                 issn = "2169-9402",
             language = "en",
           targetfile = "lima_meteor.pdf",
        urlaccessdate = "03 dez. 2020"