@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 = "11 maio 2024"
}