author = "Arruda, Daniela Cristina Santana and Sobral, Jos\é and 
                         Andrade, Humberto and Abdu, Mangalathayil Ali and Castilho, Vivian 
                         Moreira and Takahashi, Hisao and Medeiros, A. F. and Buriti, R. 
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and {bUniversidade Federal de Campina Grande (UFCG)} and 
                         {bUniversidade Federal de Campina Grande (UFCG)}",
                title = "Theoretical and experimental zonal drift velocities of the 
                         ionospheric plasma bubbles over the Brazilian region",
              journal = "Advances in Space Research",
                 year = "2006",
               volume = "38",
               number = "11",
                pages = "2610--2614",
             keywords = "Ionospheric bubbles, OI630 nm airglow, Zonal plasma drifts, 
                         Equatorial ionosphere.",
             abstract = "This work presents equatorial ionospheric plasma bubble zonal 
                         drift velocity observations and their comparison with model 
                         calculations. The bubble zonal velocities were measured using 
                         airglow OI630 nm all-sky digital images and the model calculations 
                         were performed taking into account flux-tube integrated Pedersen 
                         conductivity and conductivity weighted neutral zonal winds. The 
                         digital images were obtained from an all-sky imaging system 
                         operated over the low-latitude station Cachoeira Paulista (Geogr. 
                         22.5S, 45W, dip angle 31.5S) during the period from October 1998 
                         to August 2000. Out of the 138 nights of imager observation, 29 
                         nights with the presence of plasma bubbles are used in this study. 
                         These 29 nights correspond to geomagnetically rather quiet days 
                         (KP < 24+) and were grouped according to season. During the early 
                         night hours, the calculated zonal drift velocities were found to 
                         be larger than the experimental values. The best matching between 
                         the calculated and observed zonal velocities were seen to be for a 
                         few hours around midnight. The model calculation showed two humps 
                         around 20 LT and 24 LT that were not present in the data. Average 
                         decelerations obtained from linear regression between 20 LT and 24 
                         LT were found to be: (a) Spring 1998, \−8.61 ms\−1 
                         h\−1; (b) Summer 1999, \−0.59 ms\−1 
                         h\−1; (c) Spring 1999, \−11.72 ms\−1 
                         h\−1; and (d) Summer 2000, \−8.59 ms\−1 
                         h\−1. Notice that Summer and Winter here correspond to 
                         southern hemisphere Summer and Winter, not northern hemisphere.",
           copyholder = "SID/SCD",
                 issn = "0273-1177",
             language = "en",
           targetfile = "Theoretical and experimental zonal drift.pdf",
        urlaccessdate = "20 jan. 2021"