Ionospheric GPS-TEC responses from equatorial region to the EIA crest in the South American sector under intense space weather conditions

Autor(es)

de Abreu, A. J. ^{[1, 2]} ; Correia, E. ^{[1, 3]} ; Denardini, C. M. ^[1] ; de Jesus, R. ^[1] ; Venkatesh, K. ^[4] ; Roberto, M. ^[2] ; Abalde, J. R. ^[2] ; Fagundes, P. R. ^[5] ; Bolzan, M. J. A. ^[6] ; Gende, M. ^[7]

Afiliação do(s) autor(es)

^[1] Inst Nacl Pesquisas Espaciais INPE, Sao Jose Dos Campos, SP - Brazil

^[2] Inst Tecnol Aeronaut ITA, Div Ciencias Fundamentais, Sao Jose Dos Campos, SP - Brazil

^[3] Univ Presbiteriana Mackenzie, Ctr Radio Astron & Astrofis Mackenzie, Sao Paulo, SP - Brazil

^[4] Phys Res Lab, Ahmadabad 380009, Gujarat - India

^[5] Univ Vale Paraiba UNIVAP, Lab Fis & Astron, Sao Jose Dos Campos, SP - Brazil

^[6] Univ Fed Jatai UFJ, Lab Astron & Fis Espacial LAFEJ, Jatai, Go - Brazil

^[7] Univ Nacl La Plata UNLP, Fac Ciencias Astron & Geofis, La Plata - Argentina

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 227, JAN 2022.
• Citações Web of Science: 0

Resumo

We present and discuss the ionospheric F-region observations from equator to the equatorial ionization anomaly (EIA) regions over the South American sector during an intense space weather event occurred between 27 and May 29, 2017. During this geomagnetic storm, the symmetric-H (SYM-H) reached a minimum of -142 nT at similar to 0700 UT on May 28, 2017. For this investigation, we analyze the vertical total electron content (VTEC) observations from a chain of nearly 120 Global Positioning System (GPS) stations. Magnetometer measurements obtained at two stations in the low latitude regions are also presented. The observations do not indicate prompt penetration electric field (PPEF) effects in the VTEC variations. Magnetometer's observations over Cuiab'a (CBA) and Cachoeira Paulista (CXP) in central west and south parts of Brazil, respectively, have shown a strong crosscorrelation with SYM-H in the period between 3 and 48 h. The results also show positive ionospheric storm phase during the recovery phase on May 28, 2017. Positive effect during the recovery phase of the geomagnetic storm is possibly associated with effects of disturbances winds. During the recovery phase, a strong intensification of the EIA took place, possibly related to an additional ionization effect. The VTEC values show differences between the west and east sectors. This indicates that the EIA crest is stronger in the east sector than in the west sector, possibly due to the combination of disturbance wind effects and geomagnetic field geometry where in the east sector the field lines are more inclined. (AU)

• Processo FAPESP: 19/05455-2 - Caracterização da dinâmica da ionosfera no setor da América do Sul e Antártica frente aos impactos do clima espacial
• Beneficiário: Emilia Correia
• Modalidade de apoio: Auxílio à Pesquisa - Regular