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@Article{PaulinoMVWTBLFBSG:2016:PeWaLo,
               author = "Paulino, I. and Medeiros, A. Fragoso and Vadas, S. L. and Wrasse, 
                         Cristiano Max and Takahashi, Hisao and Buriti, R. A. and Leite, 
                         Danubia and Filgueira, Samuel and Bageston, Jos{\'e} Valentin and 
                         Sobral, Jos{\'e} Humberto Andrade and Gobbi, Delano",
          affiliation = "{Universidade Federal de Campina Grande (UFCG)} and {Universidade 
                         Federal de Campina Grande (UFCG)} and {Colorado Research 
                         Association} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} 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 = "Periodic waves in the lower thermosphere observed by OI630 nm 
                         airglow images",
              journal = "Annales Geophysicae",
                 year = "2016",
               volume = "34",
               number = "2",
                pages = "293--301",
                month = "Feb.",
             keywords = "Ionosphere (wave propagation), meteorology and atmospheric 
                         dynamics (thermospheric dynamics, waves and tides).",
             abstract = "Periodic wave structures in the thermosphere have been observed at 
                         S{\~a}o Jo{\~a}o do Cariri (geographic coordinates: 36.5 W, 
                         7.4 S; geomagnetic coordinates based on IGRF model to 2015: 35.8 
                         E, 0.48 N) from September 2000 to November 2010 using OI630.0 nm 
                         airglow images. During this period, which corresponds to almost 
                         one solar cycle, characteristics of 98 waves were studied. 
                         Similarities between the characteristics of these events and 
                         observations at other places around the world were noted, 
                         primarily the spectral parameters. The observed periods were 
                         mostly found between 10 and 35 min; horizontal wavelengths ranged 
                         from 100 to 200 km, and phase speed from 30 to 180 m sg-1. These 
                         parameters indicated that some of the waves, presented here, are 
                         slightly faster than those observed previously at low and middle 
                         latitudes (Indonesia, Carib and Japan), indicating that the 
                         characteristics of these waves may change at different places. 
                         Most of observed waves have appeared during magnetically quiet 
                         nights, and the occurrence of those waves followed the solar 
                         activity. Another important characteristic is the 
                         quasi-monochromatic periodicity that distinguish them from the 
                         single-front medium-scale traveling ionospheric disturbances 
                         (MSTIDs) that have been observed previously over the Brazilian 
                         region. Moreover, most of the observed waves did not present a 
                         phase front parallel to the northeast-southwest direction, which 
                         is predicted by the Perkins instability process. It strongly 
                         suggests that most of these waves must have had different 
                         generation mechanisms from the Perkins instability, which have 
                         been pointed out as being a very important mechanism for the 
                         generation of MSTIDs in the lower thermosphere.",
                  doi = "10.5194/angeo-34-293-2016",
                  url = "http://dx.doi.org/10.5194/angeo-34-293-2016",
                 issn = "0992-7689",
             language = "en",
           targetfile = "Paulino_periodic.pdf",
        urlaccessdate = "05 dez. 2020"
}


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