%0 Journal Article
%@holdercode {isadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S}
%@nexthigherunit 8JMKD3MGPCW/3ETL868
%X 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.
%8 Set.
%N 5
%T Dependence of the F-region peak electron density (foF2) on solar activity observed in the equatorial ionospheric anomaly region in the Brazilian sector
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress
%@electronicmailaddress valdirgp@univap.br
%@secondarytype PRE PI
%K Ionosphere, Solar cycle, Electronic density, Brazilian sector.
%@archivingpolicy denypublisher denyfinaldraft24
%@usergroup administrator
%@usergroup lattes
%@usergroup secretaria.cpa@dir.inpe.br
%@usergroup tereza@sid.inpe.br
%@group
%@group DAE-CEA-INPE-MCT-BR
%@e-mailaddress valdirgp@univap.br
%3 Cardoso-AdvSpaceRes-v48-p837-41-science[1].pdf
%@secondarymark B4_ASTRONOMIA_/_FÍSICA B3_CIÊNCIAS_BIOLÓGICAS_I B1_ENGENHARIAS_III B1_ENGENHARIAS_IV B1_GEOCIÊNCIAS B1_INTERDISCIPLINAR
%F lattes: 1106857072073407 5 CardosoSaGuFaPiSi:2011:DeOfTh
%@issn 0273-1177
%2 dpi.inpe.br/plutao/2011/09.22.18.53.21
%@affiliation Laboratory of Physics and Astronomy, IPD/Universidade do Vale do Paraiba (UNIVAP), Avenida Shishima Hifumi, 2911, Urbanova, CEP:12244-000, São José dos Campos, São Paulo, Brazil
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation IPD Univ Vale Paraiba UNIVAP, Lab Phys & Astron, BR-12244000 Sao Paulo, Brazil
%@affiliation IPD Univ Vale Paraiba UNIVAP, Lab Phys & Astron, BR-12244000 Sao Paulo, Brazil
%@affiliation IPD Univ Vale Paraiba UNIVAP, Lab Phys & Astron, BR-12244000 Sao Paulo, Brazil
%@affiliation IPD Univ Vale Paraiba UNIVAP, Lab Phys & Astron, BR-12244000 Sao Paulo, Brazil
%B Advances in Space Research
%@versiontype publisher
%P 837-841
%4 dpi.inpe.br/plutao/2011/09.22.18.53
%@documentstage not transferred
%D 2011
%V 48
%@doi 10.1016/j.asr.2011.04.016
%A Cardoso, F. A.,
%A Sahai, Y.,
%A Guarnieri, F. L.,
%A Fagundes, P. R.,
%A Pillat, Valdir Gil,
%A Silva, J. V. P. R.,
%@dissemination WEBSCI; PORTALCAPES; MGA; COMPENDEX.
%@area CEA