@Article{AndrioliFriBatCleJan:2013:DiVaGr,
               author = "Andrioli, V{\^a}nia F{\'a}tima and Fritts, David C. and Batista, 
                         Paulo Prado and Clemesha, Barclay Robert and Janches, D.",
          affiliation = "{} and GATS Boulder, Boulder, CO USA and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and NASA, GSFC, Space Weather Lab, Greenbelt, MD 
                         20771 USA",
                title = "Diurnal variation in gravity wave activity at low and middle 
                         latitudes",
              journal = "Annales Geophysicae",
                 year = "2013",
               volume = "31",
               number = "11",
                pages = "2123--2135",
                 note = "{Setores de Atividade: Pesquisa e desenvolvimento 
                         cient{\'{\i}}fico.}",
             keywords = "Meteorology and atmospheric dynamics, Waves and tides, LOCAL BODY 
                         FORCES, MOMENTUM FLUXES, METEOR RADAR, SEASONAL-VARIATIONS, 
                         CACHOEIRA-PAULISTA, 22.7-DEGREES-S, WINDS, VARIABILITY, MODELS, 
                         REGION.",
             abstract = "We employ a modified composite day extension of the Hocking (2005) 
                         analysis method to study gravity wave (GW) activity in the 
                         mesosphere and lower thermosphere using 4 meteor radars spanning 
                         latitudes from 7 degrees S to 53.6 degrees S. Diurnal and 
                         semidiurnal modulations were observed in GW variances over all 
                         sites. Semidiurnal modulation with downward phase propagation was 
                         observed at lower latitudes mainly near the equinoxes. Diurnal 
                         modulations occur mainly near solstice and, except for the zonal 
                         component at Cariri (7 degrees S), do not exhibit downward phase 
                         propagation. At a higher latitude (SAAMER, 53.6 degrees S) these 
                         modulations are only observed in the meridional component where we 
                         can observe diurnal variation from March to May, and semidiurnal, 
                         during January, February, October (above 88 km) and November. Some 
                         of these modulations with downward phase progression correlate 
                         well with wind shear. When the wind shear is well correlated with 
                         the maximum of the variances the diurnal tide has its largest 
                         amplitudes, i.e., near equinox. Correlations exhibiting variations 
                         with tidal phases suggest significant GW-tidal interactions that 
                         have different characters depending on the tidal components and 
                         possible mean wind shears. Modulations that do not exhibit phase 
                         variations could be indicative of diurnal variations in GW 
                         sources.",
                  doi = "10.5194/angeo-31-2123-2013",
                  url = "http://dx.doi.org/10.5194/angeo-31-2123-2013",
                 issn = "0992-7689",
                label = "lattes: 2306964700488382 3 AndrioliFriBatCleJan:2013:DiVaGr",
             language = "en",
           targetfile = "angeo-31-2123-2013.pdf",
        urlaccessdate = "20 maio 2024"
}