author = "Nyassor, Prosper K. and Buriti, Ricardo Arlen and Paulino, Igo and 
                         Medeiros, Amauri F. and Takahashi, Hisao and Wrasse, Cristiano Max 
                         and Gobbi, Delano",
          affiliation = "{Universidade Federal de Campina Grande (UFCG)} and {Universidade 
                         Federal de Campina Grande (UFCG)} 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)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Determination of gravity wave parameters in the airglow combining 
                         photometer and imager data",
              journal = "Annales Geophysicae",
                 year = "2018",
               volume = "36",
               number = "3",
                pages = "705--715",
                month = "May",
             keywords = "Atmospheric composition and structure, air-glow and aurora, 
                         electromagnetics, wave propagation, history of geophysics, 
                         atmospheric sciences.",
             abstract = "Mesospheric airglow measurements of two or three layers were used 
                         to characterize both vertical and horizontal parameters of gravity 
                         waves. The data set was acquired coincidentally from a 
                         multi-channel filter (Multi-3) photometer and an all-sky imager 
                         located at Sao Joao do Cariri (7.4 degrees S, 36.5 degrees W) in 
                         the equatorial region from 2001 to 2007. Using a least-square 
                         fitting and wavelet analysis technique, the phase and amplitude of 
                         each observed wave were determined, as well as the amplitude 
                         growth. Using the dispersion relation of gravity waves, the 
                         vertical and horizontal wavelengths were estimated and compared to 
                         the horizontal wavelength obtained from the keogram analysis of 
                         the images observed by an all-sky imager. The results show that 
                         both horizontal and vertical wavelengths, obtained from the 
                         dispersion relation and keogram analysis, agree very well for the 
                         waves observed on the nights of 14 October and 18 December 2006. 
                         The determined parameters showed that the observed wave on the 
                         night of 18 December 2006 had a period of similar to 43.8 +/- 2.19 
                         min, with the horizontal wavelength of 235.66 +/- 11.78 km having 
                         a downward phase propagation, whereas that of 14 October 2006 
                         propagated with a period of similar to 36.00 +/- 1.80 min with a 
                         horizontal wavelength of similar to 195 +/- 9.80 km, and with an 
                         upward phase propagation. The observation of a wave taken by a 
                         photometer and an allsky imager allowed us to conclude that the 
                         same wave could be observed by both instruments, permitting the 
                         investigation of the two-dimensional wave parameter.",
                  doi = "10.5194/angeo-36-705-2018",
                  url = "http://dx.doi.org/10.5194/angeo-36-705-2018",
                 issn = "0992-7689",
             language = "en",
           targetfile = "nyassor_determination.pdf",
        urlaccessdate = "11 maio 2021"