@InProceedings{CorreiaRunhBageDAmi:2021:ChGrWa,
               author = "Correia, Emilia and Runheitte, L. T. M. and Bageston, Jos{\'e} 
                         Valentin and D'Amico, D. E.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Centro de 
                         R{\'a}dio Astronomia e Astrof{\'{\i}}sica Mackenzie} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and {Centro de 
                         R{\'a}dio Astronomia e Astrof{\'{\i}}sica Mackenzie}",
                title = "Characterization of gravity waves in the lower ionosphere using 
                         VLF observations at Comandante Ferraz Brazilian Antarctic 
                         Station",
                 year = "2021",
         organization = "Simp{\'o}sio Brasileiro de Geof{\'{\i}}sica Espacial e 
                         Aeronomia, 8. (SBGEA)",
             abstract = "The goal of this work is to investigate the gravity waves (GWs) 
                         characteristics in the low ionosphere using very low frequency 
                         (VLF) radio signals. The spatial modulations produced by the GWs 
                         affect the conditions of the electron density at reflection height 
                         of the VLF signals, which produce fluctuations of the electrical 
                         conductivity in the D-region that can be detected as variations in 
                         the amplitude and phase of VLF narrowband signals. The analysis 
                         considered the VLF signal transmitted from the US Cutler/Marine 
                         (NAA) station that was received at Comandante Ferraz Brazilian 
                         Antarctic Station (EACF, 62.1o S, 58.4o W), which is a great 
                         circle path crossing longitudinally the Drake Passage. The wave 
                         periods of the GWs detected in the low ionosphere are obtained 
                         using the wavelet analysis applied to the VLF amplitude. The use 
                         of the VLF technique was validated comparing the wave period and 
                         duration properties of one GW event observed simultaneously with a 
                         co-located airglow all-sky imager both operating at EACF. The 
                         statistical analysis of the wave periods detected using VLF 
                         technique for 2007 showed that the GW events occur almost all 
                         nights, with a higher frequency per month from March to October. 
                         The predominant wave periods are more frequent between 10 and 15 
                         min occurring preferentially during the equinoxes, but there are 
                         some events with periods higher than 60 min appearing only in the 
                         solstices (January and July). These results show that VLF 
                         technique is a powerful tool to obtain the wave period and 
                         duration of GW events in the low ionosphere, with the advantage to 
                         be independent of sky conditions, and can be used during daytime 
                         and year-round.",
  conference-location = "Online",
      conference-year = "22-26 mar.",
             language = "en",
           targetfile = "Correiaetal-2020-angeo-GW-VLF.pdf",
        urlaccessdate = "30 abr. 2024"
}