author = "Almeida, Aline A. de and Pimenta, Alexandre Alvares",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)}",
                title = "Airglow study of ionospheric plasma irregularities",
            booktitle = "Proceedings...",
                 year = "2009",
         organization = "Iaga, 2009.",
             keywords = "Plasma irregularities, airglow.",
             abstract = "An instrument for all-sky spectrophotometric imaging was developed 
                         for airglow measurements. A 630.0 nm airglow imaging system has 
                         been developed for ground-based studies of the optical signatures 
                         of tropical plasma irregularities in the F-region. The system was 
                         designed for narrowband interference filters (10 angstrom full 
                         width at half power) with all-sky (180) lenses and records images 
                         photographically by using a standard Nikon D300 camera. A field 
                         test of the apparatus was conducted on Cachoeira Paulista close to 
                         the southern crest of the equatorial ionization anomaly (22.7S, 
                         45.0 W, dip angle = -28) from March 20 to March 29, 2009. The 
                         optical signature of plasma irregularities are airglow depletion 
                         bands in the OI 630 nm emission like plasma bubbles or MSTIDs. The 
                         production of the OI 630.o nm emission depends on the molecular 
                         oxygen density [O2] and on the oxygen ion density [O+]. The oxygen 
                         ion density [O+] is approximately equal to the electron density in 
                         the F-region. The height of the F-layer peak electron density is 
                         around 350400 km, while the molecular oxygen density [O2] 
                         increases with decreasing height. Thus, the OI 630 nm emission 
                         peak occurs in the bottomside of the F region around 220300 km. 
                         The initial results to come from these observations show the 
                         presence of airglow depletions in the OI 630 nm. In this work, the 
                         characteristics and resolution of the all-sky developed is present 
                         and discuss.",
  conference-location = "Sopron, Hungary",
      conference-year = "23-30 Aug.",
             language = "en",
        urlaccessdate = "18 jan. 2021"