@Article{FagundesSahaTaka:1995:InOI55,
               author = "Fagundes, Paulo Roberto and Sahai, Yogeshwar and Takahashi, 
                         Hisao",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {} and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Investigation of OI 557.7 nm and OI 630.0 nm nightglow intensity 
                         ratios during the occurrence of equatorial F-region plasma 
                         bubbles",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "1995",
               volume = "57",
               number = "8",
                pages = "929--932",
                month = "July",
             keywords = "aeronomia, bolhas de plasma, plasma bubbles, nightglow, equatorial 
                         F-region.",
             abstract = "It is well-known that, at equatorial and low-latitudes, the OI 
                         557.7 nm emission emanates both from the mesosphere and F-region. 
                         Earlier investigations using, in general, ground-based 
                         simultaneous obeservations indicate that the contribution to the 
                         OI 557.7 nm emission from the F-region is about 20 of the F-region 
                         OI 630.0 nm emission. Both of these emissions are excited by the 
                         dissociative recombination process (O+2+e-O*(1S, 1D)+O) in the 
                         F-region. The nocturnal intensity variations of these emissions 
                         sometimes show large short-lived depletions, associated with the 
                         passage of equatorial spread-F plasma bubbles through the field of 
                         view of a photometer. Regular observations of these emissions have 
                         been carried out at Cachoeira Paulista (22.7 degrees S, 45.0 
                         degrees W), Brazil, since 1973. In this paper, we present and 
                         discuss simultaneous observations of these emissions, during 
                         periods of strong equatorial spread-F conditions, when both 
                         emissions show large intensity drop-outs. Twenty-five nights of 
                         measurements from Cachoeira Paulista have been analysed for this 
                         study, which indicate that the average ratio of the intensity 
                         depletions (Delta I557.7 nm/Delta I630 nm) is about 0.26+-0.07 for 
                         F-region altitudes, and this components has a dependence on the 
                         eight of the electron density profile.",
                 issn = "1364-6826",
                label = "7137",
             language = "en",
           targetfile = "1-s2.0-002191699400064U-main.pdf",
        urlaccessdate = "29 jun. 2024"
}