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@Article{CardosoSaGuFaPiSi:2011:DeFrPe,
               author = "Cardoso, F. A. and Sahai, Y. and Guarnieri, F. L. and Fagundes, P. 
                         R. and Pillat, Valdir Gil and Silva, J. V. P. R.",
          affiliation = "Laboratory of Physics and Astronomy, IPD/Universidade do Vale do 
                         Paraiba (UNIVAP), Avenida Shishima Hifumi, 2911, Urbanova, 
                         CEP:12244-000, S{\~a}o Jos{\'e} dos Campos, S{\~a}o Paulo, 
                         Brazil and {Instituto Nacional de Pesquisas Espaciais (INPE)} and 
                         IPD Univ Vale Paraiba UNIVAP, Lab Phys \& Astron, BR-12244000 Sao 
                         Paulo, Brazil and IPD Univ Vale Paraiba UNIVAP, Lab Phys \& 
                         Astron, BR-12244000 Sao Paulo, Brazil and IPD Univ Vale Paraiba 
                         UNIVAP, Lab Phys \& Astron, BR-12244000 Sao Paulo, Brazil and IPD 
                         Univ Vale Paraiba UNIVAP, Lab Phys \& Astron, BR-12244000 Sao 
                         Paulo, Brazil",
                title = "Dependence of the F-region peak electron density (foF2) on solar 
                         activity observed in the equatorial ionospheric anomaly region in 
                         the Brazilian sector",
              journal = "Advances in Space Research",
                 year = "2011",
               volume = "48",
               number = "5",
                pages = "837--841",
                month = "Set.",
             keywords = "Ionosphere, Solar cycle, Electronic density, Brazilian sector.",
             abstract = "The long-term (solar cycle) changes in the Sun and how it affects 
                         the ionospheric F-region observed at Sao Jose dos Campos (23.2 
                         degrees S, 45.9 degrees W), Brazil, a location under the southern 
                         crest of the equatorial ionospheric anomaly, have been 
                         investigated in this paper. The dependence of the F-region peak 
                         electron density (foF2) on solar activity during the descending 
                         phase of the 23rd solar cycle for the periods of high, medium, and 
                         low solar activity has been studied. The ionospheric F-region peak 
                         electron densities observed during high and medium solar activity 
                         show seasonal variations with maxima close to the equinox periods, 
                         whereas during the low solar activity the maxima during the 
                         equinox periods is absent. However, during the low solar activity 
                         only change observed is a large decrease from summer to winter 
                         months. We have further investigated changes in the different 
                         ionospheric F-region parameters (minimum virtual height of the 
                         F-region (h'F), virtual height at 0.834foF2 (hpF2), and foF2) 
                         during summer to winter months in low solar activity periods, 
                         2006-2007 and 2007-2008. Large changes in the two ionospheric 
                         parameters (hpF2 and foF2) are observed during summer to winter 
                         months in the two low solar activity periods investigated.",
                  doi = "10.1016/j.asr.2011.04.016",
                  url = "http://dx.doi.org/10.1016/j.asr.2011.04.016",
                 issn = "0273-1177",
                label = "lattes: 1106857072073407 5 CardosoSaGuFaPiSi:2011:DeOfTh",
             language = "en",
           targetfile = "Cardoso-AdvSpaceRes-v48-p837-41-science[1].pdf",
        urlaccessdate = "18 jan. 2021"
}


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