@Article{FagundesBAMMSAPSAPA:2012:AtNiSp,
               author = "Fagundes, P. R. and Bittencourt, J. A. and Abreu, A. J. and Moor, 
                         Lilian and Muella, M. T. A. H. and Sahai, Y. and Abalde, Jos{\'e} 
                         Ricardo and Pezzopane, M. and Sobral, Jose Humberto Andrade and 
                         Abdu, M. A. and Pimenta, Alexandre Alvares and Amorim, D. C. M.",
          affiliation = "Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and Univ Vale Paraiba, 
                         BR-12244000 Sao Jose Dos Campos and Univ Vale Paraiba, BR-12244000 
                         Sao Jose Dos Campos and Univ Vale Paraiba, BR-12244000 Sao Jose 
                         Dos Campos and Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos 
                         and Univ Vale Paraiba, BR-12244000 Sao Jose Dos Campos and Ist 
                         Nazl Geofis \& Vulcanol, I-00143 Rome, Italy 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 = "Atypical nighttime spread-F structure observed near the southern 
                         crest of the ionospheric equatorial ionization anomaly",
              journal = "Journal of Geophysical Research",
                 year = "2012",
               volume = "117",
               number = "A04308",
                pages = "9--18",
                month = "Apr.",
             keywords = "F-region, Ionosphere, irregularities, plasma, thermospheric, 
                         region plasma depletions, additional layer, zonal velocities, 
                         fortaleza, bubbles, Brazil, solar, generation, ionograms, 
                         f3-layer.",
             abstract = "An atypical nighttime spread-F structure is observed on ionograms 
                         at or above the F-2 trace, near the crest of the ionospheric 
                         equatorial ionization anomaly (EIA) region. This ionospheric 
                         atypical spread-F phenomenon was observed using two closed spaced 
                         (similar to 115 km) ionospheric soundings stations located in Sao 
                         Jose dos Campos (23.21 degrees S, 45.97 degrees W) and Cachoeira 
                         Paulista (22.70 degrees S, 45.01 degrees W), Brazil, in a 
                         low-latitude station (near the southern crest of the EIA region), 
                         during nighttime, low solar activity, and quiet geomagnetic 
                         conditions. This structure, in the initial phase, appears in the 
                         ionogram as a faint spread-F trace above or at the F-2-layer peak 
                         height. After a few minutes, it develops into a strong spread-F 
                         trace, and afterwards, it moves to altitudes below the F-2-layer 
                         peak heights. Finally, the atypical nighttime F-layer trace 
                         structure may remain for a while between the F-layer bottom side 
                         and peak height or can move to an altitude above the F-layer peak 
                         height, and then it disappears. In order to have a comprehensive 
                         view of the ionospheric environment characterizing the phenomenon 
                         under study, complementary data from six GPS station were used to 
                         investigate the ionosphere environment conditions, during both 
                         events. The six GPS stations used in this study are distributed 
                         from near the equatorial region to low latitudes and provide 
                         evidence that the atypical nighttime spread-F structures are not 
                         related with large scale equatorial irregularities (plasma 
                         bubbles).",
                  doi = "10.1029/2011JA017118",
                  url = "http://dx.doi.org/10.1029/2011JA017118",
                 issn = "0148-0227",
                label = "lattes: 0665861578886219 11 FagundesBAMSASAPA:2012:AtNiSp",
             language = "en",
           targetfile = "2011JA017118.pdf",
        urlaccessdate = "13 maio 2024"
}