@Article{MoroDenResCheSch:2016:2.SeVa,
               author = "Moro, Juliano and Denardini, Clezio Marcos and Resende, Laysa 
                         Cristina Ara{\'u}jo and Chen, Sony Su and Schuch, Nelson Jorge",
          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)}",
                title = "Equatorial region electric fields at the dip equator: 2. Seasonal 
                         variabilities and effects over Brazil due to the secular variation 
                         of the magnetic equator",
              journal = "Journal of Geophysical Research: Space Physics",
                 year = "2016",
               volume = "121",
               number = "10",
                pages = "10231--10240",
             abstract = "The equatorial electrojet (EEJ) is an intense eastward ionospheric 
                         electric current centered at about 105 km of altitude along the 
                         dip equator, set up by the global neutral wind dynamo that 
                         generates the eastward zonal (Ey) and the daytime vertical (Ez) 
                         electric fields. The temporal variation of the EEJ is believed to 
                         be well understood. However, the longitudinal variability of the 
                         Ey and Ez between 100 and 110 km is still quite scarce. Due to 
                         their importance overall phenomenology of the equatorial 
                         ionosphere, we investigate the variabilities of the Ey and Ez 
                         inferred from measurements of the Doppler frequency of Type II 
                         echoes provided by coherent backscatter radars installed in 
                         locations close to the magnetic equator in the eastern Brazil 
                         (2.33°S, 44.20°W) and Peru (11.95°S, 76.87°W). This study is based 
                         on long-term (609 days for both systems) radar soundings collected 
                         from 2001 to 2010. The variabilities of the electric fields are 
                         studied in terms of the position of the soundings with respect to 
                         the dip equator and the magnetic declination angle. Among the 
                         results, Ey and Ez show longitudinal dependence, being higher in 
                         Peru than east Brazil. Under quiet geomagnetic activity, the mean 
                         diurnal variations of Ey ranged from 0.21 to 0.35 mV/m between 8 
                         and 18 h (LT) in Brazil and from 0.23 mV/m to 0.45 mV/m in Peru, 
                         while the mean diurnal variations of the Ez ranges from 7.09 to 
                         8.80 mV/m in Brazil and from 9.00 to 11.18 mV/m in Peru.",
                  doi = "10.1002/2016JA022753",
                  url = "http://dx.doi.org/10.1002/2016JA022753",
                 issn = "2169-9402",
                label = "lattes: 0549130828972280 5 MoroNarResCheSch:2016:2.SeVa",
             language = "en",
        urlaccessdate = "27 abr. 2024"
}