@Article{SobralBABSZTN:1997:PoWi63,
               author = "Sobral, Jos{\'e} Humberto Andrade and Borba, Gilvan L. and Abdu, 
                         Mangalathayil Ali and Batista, Inez Staciarini and Sawant, 
                         Hanumant Shankar and Zamlutti, Carlos Jos{\'e} and Takahashi, 
                         Hisao and Nakamura, Y",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal do Rio Grande do Norte-UFRN} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Post-sunset wintertime 630.0 nm airglow perturbations associated 
                         with gravity waves at low latitudes in the South America sector",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "1997",
               volume = "59",
               number = "13",
                pages = "1611--1623",
             keywords = "aeronomia, atl{\^a}ntico sul, regi{\~a}o f, oxig{\^e}nio, 
                         ionosfera, ondas de radio, ionossonda, aeronomy, south atlantic, f 
                         region, oxygen, ionosphere, radio waves.",
             abstract = "We report photometric southern hemisphere wintertime perturbations 
                         of the nocturnal F-region atomic oxygen 630 nm red line intensity 
                         which are observed to occur concurrently with apparent ionogram 
                         signatures of F-region gravity waves. Such airglow events were 
                         detected on a total of 40 days of experiments. The airglow 
                         experiments were run at Cachoeira Paulista (CP, geographic 22°41' 
                         S, 45°00' W, dip 28°S). The events are characterized by 
                         south-to-north travelling airglow valleys, or depletion events 
                         (SNE). They were obtained from a set of 299 experiments performed 
                         during the period of 10 August 1977 to 4 July 1984. Their 
                         equatorwards velocities, wavelengths and periods vary within the 
                         ranges of 150-300ms^-1, 100-200 km and 15 min - 3 h, respectively. 
                         They appear during the post-sunset period and remain within the 
                         field of view of the meridional scanning photometer from about ten 
                         minutes to a few hours. The SNE were seen to occur more frequently 
                         in July and were absent from September to March. The photometer 
                         scanned +- 75° around zenith in the magnetic meridional and zonal 
                         planes. ionogram. spread-F and VHF polarimeter data that showed no 
                         phase or amplitude scintillations during the SNE indicated no 
                         concurrent existence of equatorial plasma depletions. It is shown 
                         that the SNE are not necessarily related to geomagnetic disturbed 
                         conditions. The present results are, to the authors' knowledge, 
                         the first showing gravity wave effects, near the sunset side of 
                         the solar terminator, on the low-latitude F-region atomic oxygen 
                         red nightglow under undisturbed geomagnetic conditions. The 
                         characteristics of these waves point to the solar terminator as 
                         their source of generation. A series of physical and morphological 
                         features of the phenomena are presented.",
                 issn = "1364-6826",
                label = "8728",
             language = "en",
           targetfile = "1-s2.0-S1364682696001605-main.pdf",
        urlaccessdate = "07 maio 2024"
}