author = "Guharay, A. and Batista, Paulo Prado and Clemesha, Barclay 
          affiliation = "{Physical Research Laboratory} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "On the variability of the diurnal tide and coupling with planetary 
                         waves in the MLT over Cachoeira Paulista (22.7S, 45W)",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2015",
               volume = "133",
                month = "Oct.",
             keywords = "Tides and planetary waves, Wave-wave nonlinear interactions, 
                         Meteor radar observations.",
             abstract = "Using meteor radar observations of four years in the mesosphere 
                         and lower thermosphere (MLT) over a subtropical Brazilian station, 
                         Cachoeira Paulista (22.7S, 45W), the temporal variability 
                         characteristics of the diurnal tide have been studied. In addition 
                         to the semiannual, annual and interannual variations, the diurnal 
                         tide amplitude exhibits clear intermittent modulation at periods 
                         of planetary waves. The tidal amplitude exhibits clear seasonal 
                         pattern with largest amplitude in fall equinox. The dominant 
                         periods of modulation of the diurnal tide are found to be greater 
                         than 10 days in the MLT. The diurnal tide, as detected in the 
                         power spectra of the horizontal winds, shows a spread in period 
                         around the central period (24 h) which is an indication of 
                         nonlinear interactions between the diurnal tide and planetary 
                         waves. A bispectral analysis reveals prominent triplets (two 
                         primary waves and a secondary wave) confirming the interaction of 
                         the diurnal tide with planetary waves persistent over a broad 
                         spectral range. Also there is an indication of coupling of the 
                         diurnal tide with the intraseasonal oscillations at various times 
                         of the year.",
                  doi = "10.1016/j.jastp.2015.07.016",
                  url = "http://dx.doi.org/10.1016/j.jastp.2015.07.016",
                 issn = "1364-6826",
             language = "en",
        urlaccessdate = "18 jan. 2021"