@Article{FagundesSahaBittTaka:1995:ReGeEq,
               author = "Fagundes, Paulo Roberto and Sahai, Yogeshwar and Bittencourt, Jose 
                         Augusto and Takahashi, Hisao",
                title = "Relationship between generation of the equatorial F-region plasma 
                         bubbles and thermospheric dynamics",
              journal = "Advances in Space Research",
                 year = "1995",
               volume = "16",
               number = "5",
                pages = "117--120",
             keywords = "AERONOMIA, bolhas de plasma, termosfera, din{\^a}micas, ondas 
                         gravitacionais, regi{\~a}o F, irregularidades, 
                         propaga{\c{c}}{\~a}o F, plasma bubbles, spread F, thermosphere, 
                         dynamics, gravity waves, irregularities.",
             abstract = "Simultaneous zenith measurements of the OI 630.0 nm and 557.7 nm 
                         nightglow emissions, using a multi-channel tilting filter type 
                         photometer and nighttime thermospheric neutral wind velocities 
                         from the Doppler shifts of the OI 630.0 nm emission line, using a 
                         Fabry-Perot interferometer, have been carried out at Cachoeira 
                         Paulista (23 degrees S, 45 degrees W), Brazil, during 1988-1991. 
                         These measurements constitute a unique opportunity to study the 
                         relationship between the generation of F-region plasma bubbles 
                         (regions of depleted electron densities) and thermospheric 
                         dynamics. During the period of March 1988 to June 1991, we have 9 
                         nights on which there were nearly full nights of simultaneous 
                         observations of thermospheric wind velocities (zonal and 
                         meridional) and the OI 630.0 nm and 557.7 nm emissions showing 
                         formation of plasma bubbles. On the night of March 18, 1991, the 
                         zonal wind was unusually strong in the beginning of the night (300 
                         m/s) and this night shows very strong formation of plasma bubbles, 
                         indicating that a strong zonal wind in some way may be connected 
                         with plasma bubble formation through the electric field created by 
                         the interaction between the zonal wind and the Earth's magnetic 
                         field. However, both the zonal and meridional winds on several 
                         nights with, and without plasma bubbles, are comparable. This 
                         feature possibly indicates only a secondary role of thermospheric 
                         winds in the generation of the equatorial ionospheric plasma 
                         depletions. It should be pointed out that an analysis of the 
                         nocturnal intensity variations of simultaneous mesospheric 
                         (E-region) emissions (O1 557.7 nm, O-2 atm. 864.5 nm, NaD 589.0 nm 
                         and OH (9-4) 775.0 nm) on all the nine nights studied, shows the 
                         presence of gravity waves, indicating possible relation between 
                         wave processes in the mesosphere and F-region irregularities.",
                 issn = "0273-1177",
                label = "7145",
             language = "en",
           targetfile = "1-s2.0-027311779500180M-main.pdf",
        urlaccessdate = "12 maio 2024"
}