@Article{AbduBatiKantSobr:1982:GrWaIn,
               author = "Abdu, Mangalathayil Ali and Batista, Inez Staciarini and Kantor, 
                         Ivan Jelinek and Sobral, Jos{\'e} Humberto Andrade",
          affiliation = "{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 = "Gravity wave induced ionization layers in the night F-region over 
                         Cachoeira Paulista (22ºS45ºW)",
              journal = "Journal of Atmospheric and Terrestrial Physics",
                 year = "1982",
               volume = "44",
               number = "9",
                pages = "759--767",
             abstract = "Ionosonde observations over Cachoeira Paulista (223, 45W), a 
                         low-latitude station, show distorted h(f) traces in the ionograms 
                         due to passage of TIDs. The distortions of the traces, at times, 
                         take the form of an F-region bifurcated into two distinct layers. 
                         These effects are observed mostly during presunrise hours. One 
                         specific event is studied in greater detail using true height 
                         analysis of the quarter hourly ionograms. The characteristics of 
                         the electron density and height oscillations for this case are 
                         compared with the results obtained, from the simulation of the 
                         same, based on linear theory of gravity wave induced ionization 
                         perturbations. The results show that gravity wave winds of 
                         unrealistically large magnitudes are required to explain the 
                         observation. The results suggest further that the inclusion of a 
                         source of ion production in the presunrise period, perhaps, 
                         produced by precipitation of low energy ( < 10 keV) electrons in 
                         the South Atlantic anomaly, together with the ionization loss 
                         process, might lead to a better agreement between the observation 
                         and the theory.",
             language = "en",
           targetfile = "abdu_gravity.pdf",
        urlaccessdate = "2025, Jan. 22"
}