@Article{SantosSobAbdSouTak:2004:PlBuZo,
               author = "Santos, Pedrina Morais Terra dos and Sobral, Jos{\'e} Humberto 
                         Andrade and Abdu, Mangalathayil Ali and Souza, Jonas Rodrigues de 
                         and Takahashi, Hisao",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais. Divis{\~a}o de 
                         Aeronomia (INPE.DAE)} and {Instituto Nacional de Pesquisas 
                         Espaciais. Divis{\~a}o de Aeronomia (INPE.DAE)} and {Instituto 
                         Nacional de Pesquisas Espaciais. Divis{\~a}o de Aeronomia 
                         (INPE.DAE)} and {Instituto Nacional de Pesquisas Espaciais. 
                         Divis{\~a}o de Aeronomia (INPE.DAE)} and {Instituto Nacional de 
                         Pesquisas Espaciais. Divis{\~a}o de Aeronomia (INPE.DAE)}",
                title = "Plasma bubble zonal velocity variations with solar activity in the 
                         Brazilian region",
              journal = "Annales Geophysicae",
                 year = "2004",
               volume = "22",
               number = "9",
                pages = "3123--3128",
             keywords = "AERONOMY, Ionosphere, Ionospheric irregularities, Instruments and 
                         techniques, Atmospheric composition and structure, Airglow and 
                         aurora, Equatorial ionosphere, Airglow observations, Cachoeira 
                         Paulista, Low-latitude, Drifts, Irregularities, Depletions, 
                         Dynamics, Gradient, AERONOMIA, Ionosfera, Irregularidades 
                         ionosf{\'e}ricas, Composi{\c{c}}{\~a}o e estrutura 
                         atmosf{\'e}rica, Ionosfera equatorial, Din{\^a}mica, 
                         Gradiente.",
             abstract = "A statistical study of the zonal drift velocities of the 
                         ionospheric plasma bubbles using experimental airglow data 
                         acquired at the low-latitude station Cachoeira Paulista (Geogr. 
                         22.5degrees S, 45degrees W, dip angle 28degrees S) during the 
                         period of October to March, between 1980 and 1994, is presented 
                         here. This study is based on 109 nights of zonal plasma bubble 
                         velocity estimations as determined from bubbles signatures on the 
                         01630 rim scanning photometer airglow data. The zonal velocity 
                         magnitudes of the plasma bubbles are investigated with respect to 
                         solar activity and local time. It is verified that these 
                         velocities tend to increase with the solar EUV flux, using the 
                         solar 10.7-cm radio flux as a proxy (F10.7). These velocities are 
                         seen to be larger during the solar maximum activity period than in 
                         the solar minimum period. As to the local time variation. they are 
                         seen to peak before midnight, in the 20:30-22:30 LT time frame, 
                         depending on the season. The all-data plot based on the 109 nights 
                         of airglow experiments shows that the plasma bubble mean zonal 
                         drift velocities tend to decrease with local time, but they peak 
                         at 22:25 LT, where the velocity magnitude reaches 127.4 ms(-1). 
                         The zonal drift variations with local time and solar flux are 
                         shown in Figs. 1 and 2, respectively.",
           copyholder = "SID/SCD",
                 issn = "0992-7689",
             language = "en",
           targetfile = "plasma bubble.pdf",
        urlaccessdate = "19 maio 2024"
}