Studies of space weather and its influence on the ionospheric F-region in the Brazilian sector

• Grant number: 07/07842-6
• Support Opportunities: Scholarships in Brazil - Doctorate
• Effective date (Start): March 01, 2008
• Effective date (End): February 29, 2012
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geophysics
• Principal Investigator: Yogeshwar Sahai
• Grantee: Rodolfo de Jesus
• Host Institution: Instituto de Pesquisa e Desenvolvimento (IP&D). Universidade do Vale do Paraíba (UNIVAP). São José dos Campos , SP, Brazil

Abstract

The objective of the project is to study space weather events and their influence on the ionospheric F region in the Brazilian sector. It is proposed to use the ionospheric sounding and GPS (Global Positioning System) data obtained by the UNIVAP network with digital ionosondes and GPS receivers co-located at S.J. Campos (23.2º S, 45.9º W), Palmas (10.2º S, 48.8º W) and Manaus (2.9º S, 60.0º W), and a GPS receiver at Ji-Paraná (10,9º S, 63,3º W), Brazil, obtained during varying geomagnetic storm conditions and HILDCAAs (High Intensity, Long Duration, Continuous AE Activity) events, to study the influence on the equatorial and low-latitude F region. The HILDCAAs are geomagnetic events associated with occurrence of Alfvén waves in the interplanetary environment. Recent studies have shown that fast bunches of solar wind doesn’t result in the development of intense geomagnetic storms, but they can generate sub storms or HILDCAAs events, whose effects in middle and low latitudes are yet unknown. Also, the possibility exists of using ionospheric data obtained by the receivers of GPS located different places in Brazil by the Rede Nacional de Monitoramento Continuo (RBMC) operated by the IBGE (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

DE JESUS, R.; SAHAI, Y.; GUARNIERI, F. L.; FAGUNDES, P. R.; DE ABREU, A. J.; BITTENCOURT, J. A.; NAGATSUMA, T.; HUANG, C. -S.; LAN, H. T.; PILLAT, V. G.. Ionospheric response of equatorial and low latitude F-region during the intense geomagnetic storm on 24-25 August 2005. Advances in Space Research, v. 49, n. 3, p. 518-529, FEB 1 2012. (07/07842-6)

DE JESUS, R.; SAHAI, Y.; GUARNIERI, F. L.; FAGUNDES, P. R.; DE ABREU, A. J.; PILLAT, V. G.; LIMA, W. L. C.. F-region ionospheric parameters observed in the equatorial and low latitude regions during medium solar activity in the Brazilian sector and comparison with the IRI-2007 model results. Advances in Space Research, v. 47, n. 4, p. 718-728, FEB 15 2011. (07/07842-6)

DE JESUS, R.; SAHAI, Y.; GUARNIERI, F. L.; FAGUNDES, P. R.; DE ABREU, A. J.; BECKER-GUEDES, F.; BRUNINI, C.; GENDE, M.; CINTRA, T. M. F.; DE SOUZA, V. A.; et al. Effects observed in the ionospheric F-region in the South American sector during the intense geomagnetic storm of 14 December 2006. Advances in Space Research, v. 46, n. 7, p. 909-920, OCT 1 2010. (07/07842-6)