@Article{CarrascoBatiAbdu:2005:PrEnVe,
               author = "Carrasco, Alexander Jose and Batista, Inez Staciarini and Abdu, 
                         Mangalathayil Ali",
          affiliation = "Instituto Nacional de Pesquisas Espaciais, Divis{\~a}o de 
                         Aeronomia (INPE, DAE) and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)}",
                title = "The prereversal enhancement in the vertical drift for Fortaleza 
                         and the sporadic E layer",
              journal = "Journal of Atmospheric and Solar-Terrestrial Physics",
                 year = "2005",
               volume = "67",
                pages = "1610--1617",
             keywords = "equatorial ionosphere, sporadic E-layer, prereversal 
                         enhancement.",
             abstract = "Using ionogram-recorded data for the location of Fortaleza (3.8°S, 
                         38.0°W; magnetic latitude= -6), the relation between the evening 
                         prereversal enhancement in the vertical F region plasma drift (E x 
                         B) and the diurnal variation of the sporadic E layer (Es) is 
                         examined. The database examined corresponds to the period of June 
                         2001. The F region vertical drifts obtained as dh'F/dt for quiet 
                         days reveal that when the amplitudes of the evening prereversal 
                         enhancement (PRE) are higher, an interruption of an ongoing 
                         sporadic E layer is observed. A recent investigation by Abdu et 
                         al. [2003. Journal of Geophysical Research 108(A6), 1254. doi: 
                         10.1029/2002JA009285.], showed that an upward electric field, 
                         intensified during the PRE, can be responsible for the inhibition 
                         of the sporadic E layer. In this work, we investigate the possible 
                         influence of a modified conductivity on the PRE development. The 
                         model developed by Batista et al. [1986. Journal of Geophysical 
                         Research 91(A11), 1205512064.], based on the work of Heelis et al. 
                         [1974. Planetary and Space Science 22, 743756.], was used to test 
                         the response of the PRE (its amplitude, time of occurrence and 
                         time of inversion) when the electrical conductivity of the E 
                         region is modified, specifically around sunset. The real cause of 
                         this modified conductivity is not investigated here, but the 
                         presence of a sporadic E layer could partially contribute to that. 
                         The causes of the agreement or disagreement between the computed 
                         and the observed value of vertical drift are discussed.",
                  doi = "10.1016/j.jastp.2005.07.015",
                  url = "http://dx.doi.org/10.1016/j.jastp.2005.07.015",
                 issn = "1364-6826",
             language = "en",
           targetfile = "1-s2.0-S1364682605001823-main.pdf",
        urlaccessdate = "13 maio 2024"
}