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@Article{AbduSoBaSaSoRaCh:2014:RoElFi,
               author = "Abdu, M. A. and Souza, J. R. de and Batista, Inez Staciarini and 
                         Santos, A. M. and Sobral, Jos{\'e} Humberto Andrade and Rastogi, 
                         R. G. and Chandra, H.",
          affiliation = "Instituto Nacional de Pesquisas Espaciais - INPE, 12245 970 Sao 
                         Jose dos Campos, Brazil and Instituto Nacional de Pesquisas 
                         Espaciais - INPE, 12245 970 Sao Jose dos Campos, Brazil and 
                         {Instituto Nacional de Pesquisas Espaciais (INPE)} and Instituto 
                         Nacional de Pesquisas Espaciais - INPE, 12245 970 Sao Jose dos 
                         Campos, Brazil and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)} and Instituto Nacional de Pesquisas Espaciais - INPE, 
                         12245 970 Sao Jose dos Campos, Brazil; Physical Research 
                         Laboratory, Ahmedabad 380 009, India and Physical Research 
                         Laboratory, Ahmedabad 380 009, India",
                title = "The role of electric fields in sporadic E layer formation over low 
                         latitudes under quiet and magnetic storm conditions",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2014",
               volume = "115-116",
                pages = "95--105",
             keywords = "Atmospheric electricity, Electric fields, Geomagnetism, 
                         Ionospheric measurement, Magnetosphere, Shielding, Storms, Layer 
                         formation, Low latitudes, Magnetic storms, Penetration electric 
                         field, Vertical Hall eletcric fields, E region.",
             abstract = "Sporadic E layers are formed dominantly by wind shear mechanism, 
                         but their formation and dynamics are driven also by ionospheric 
                         electric fields. Investigation of low latitude sporadic E layers 
                         under quiet conditions shows that Es layer formation during post 
                         sunset hours can be disrupted or enhanced depending upon the 
                         vertical structure of the vertical electric field arising from 
                         sunset electrodynamic processes. During magnetic storms the 
                         formation and disruption of these layers are also strongly 
                         controlled by vertical Hall electric field induced by the zonal 
                         magnetospheric electric fields that penetrates to equatorial/low 
                         latitude ionosphere. Observational results on storm time Es layer 
                         responses in the Brazilian and Indian-Asian longitudes are 
                         compared. An under-shielding prompt penetration electric field 
                         (PPEF) of westward polarity that dominate the night side 
                         ionosphere, or an over-shielding electric field also of westward 
                         polarity in the evening sector can cause formation of sporadic E 
                         layers near 100km, while an eastward polarity electric field, 
                         (under-shielding/over-shielding depending upon local time) can 
                         lead to disruption of an Es layer in progress. Ionization 
                         convergence/divergence leading to the Es layer 
                         formation/disruption is driven by a vertical Hall electric field, 
                         induced by the primary zonal PPEF, in the presence of storm 
                         associated enhanced ratio of field line integrated Hall to 
                         Pedersen conductivity (H)/(P). A downward polarity of the Hall 
                         electric field leads to Es layer formation, while an upward 
                         polarity causes the Es layer disruption. An enhancement in the H/P 
                         ratio can result from E layer conductivity enhancement due to 
                         energetic particle precipitation peculiar to the longitude of the 
                         South Atlantic Magnetic Anomaly (SAMA) and/or from a drastic 
                         reduction in integrated Pederson conductivity in the form of 
                         reduced foF2 that is observed in all longitudes.",
                  doi = "10.1016/j.jastp.2013.12.003",
                  url = "http://dx.doi.org/10.1016/j.jastp.2013.12.003",
                 issn = "1364-6826",
                label = "scopus 2014-11 AbduSoBaSaSoRaCh:2014:RoElFi",
             language = "en",
           targetfile = "1-s2.0-S1364682613003155-main.pdf",
        urlaccessdate = "15 jan. 2021"
}


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