@Article{AbduBaTaMaSoMeTr:2003:CaStBr,
               author = "Abdu, Mangalathayil Ali and Batista, Inez Staciarini and 
                         Takahashi, Hisao and MacDougall, J. W. and Sobral, Jos{\'e} 
                         Humberto Andrade and Medeiros, Amauri Fragoso de and Trivedi, 
                         Nalin Babulal",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {University of Western Ontario} 
                         and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         {Universidade Federal da Paraiba} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Magnetospheric disturbance induced equatorial plasma bubble 
                         development and dynamics: A case study in Brazilian Sector",
              journal = "Journal of Geophysical Research",
                 year = "2003",
               volume = "108",
               number = "A12",
                pages = "1449 (13pp)",
                month = "Dec.",
             keywords = "electric fields, equatorial ionosphere, ionospheric disturbances, 
                         ionospheric irregularities, particle precipitation, 
                         ionosphere/atmosphere interaction.",
             abstract = "Equatorial ionospheric plasma bubble irregularity development and 
                         dynamics during the major magnetospheric storm of 26 August 1998 
                         are investigated using the data collected by a multistation and 
                         multi-instrument diagnostic network operated at equatorial and low 
                         latitude sites in Brazil, and auroral electrojet activity (AU/AL), 
                         IMF, and Dst indices. A magnetospheric disturbance onset in the 
                         morning of 26 August 1998 was initiated by a solar wind shock and 
                         associated IMF Bz polarity reversals and ssc that were soon 
                         followed by a succession of substorm-like auroral electrojet (AE) 
                         intensifications and Dst development. An IMF Bz southward turning 
                         and associated AE intensifications in the Brazilian dusk sector 
                         produced intense prompt penetration eastward electric field that 
                         caused large F region vertical drift and consequently the 
                         developments of intense postsunset equatorial anomaly and a series 
                         of intense plasma bubbles, the latter event lasting the entire 
                         night, as observed by digital ionosondes at S{\~a}o Lu{\'{\i}}s 
                         (2.33S, 315.8E, dip angle: - .5) and Fortaleza (3.9S, 321.55W, dip 
                         angle: - 9) and an all-sky imager, two scanning photometers, and a 
                         Digisonde at the lowlatitude site Cachoeira Paulista (22.6S, 315E; 
                         dip angle: - 28). A notable aspect of the dynamics of the bubbles 
                         was their initially very low eastward drift velocity which turned 
                         into steadily increasing westward velocity that lasted till early 
                         morning hours. The results show for the first time a relationship 
                         between the zonal drift velocities of optically observed 
                         large-scale bubbles (tens to hundreds of kilometers) and that of 
                         the smaller scale (kilometer sizes) structures as observed by a 
                         digital ionosonde. The results point to the dominant role of a 
                         disturbance dynamo associated westward thermospheric wind to 
                         maintain the plasma irregularity drift increasingly westward going 
                         into postmidnight hours. As an important finding, the results 
                         further show that significant contribution to the westward plasma 
                         bubble irregularity drift, normally attributed to disturbance 
                         dynamo effect, could arise from prompt penetration disturbance 
                         zonal electric field, in the course of a disturbance sequence 
                         lasting several hours. Such effect is attributed to Hall electric 
                         field arising from the primary disturbance zonal electric field, 
                         under enhanced nighttime ionospheric conductivities produced 
                         possibly by storm associated particle precipitation, in the 
                         Brazilian longitude sector in agreement with recent evidences 
                         [Abdu et al., 1998b].",
                  doi = "10.1029/2002JA009721",
                  url = "http://dx.doi.org/10.1029/2002JA009721",
                 issn = "0148-0227 and 2156-2202",
             language = "en",
           targetfile = "jgra16862.pdf",
        urlaccessdate = "02 maio 2024"
}