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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Investigation of ionospheric response to two moderate geomagnetic storms using GPS-TEC measurements in the South American and African sectors during the ascending phase of solar cycle 24

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de Abreu, A. J. [1] ; Fagundes, P. R. [1] ; Gende, M. [2] ; Bolaji, O. S. [3] ; de Jesus, R. [1] ; Brunini, C. [2]
Total Authors: 6
[1] Univ do Vale Paraiba, Dept Fis & Astron, Sao Jose Dos Campos, SP - Brazil
[2] UNLP, Fac Ciencias Astronom & Geofis, La Plata - Argentina
[3] Univ Lagos, Dept Phys, Lagos - Nigeria
Total Affiliations: 3
Document type: Journal article
Source: Advances in Space Research; v. 53, n. 9, p. 1313-1328, MAY 1 2014.
Web of Science Citations: 21

The responses of the ionospheric F region using GPS-TEC measurements during two moderate geomagnetic storms at equatorial, low-, and mid-latitude regions over the South American and African sectors in May 2010, during the ascending phase of solar cycle 24, are investigated. The first moderate geomagnetic storm studied reached a minimum Dst value of -64 nT at 1500 UT on 02 May 2010 and the second moderate geomagnetic storm reached a minimum Dst value of -85 nT at 1400 UT on 29 May 2010. In this paper, we present vertical total electron content (VTEC) and phase fluctuations (in TECU/min) from Global Positioning System (GPS) observations from the equatorial to mid-latitude regions in the South American and African sectors. Our results obtained during these two moderate geomagnetic storms from both sectors show significant positive ionospheric storms during daytime hours at the equatorial, low-, and mid-latitude regions during the main and recovery phases of the storms. The thermospheric wind circulation change towards the equator is a strong indicator that suggests an important mechanism is responsible for these positive phases at these regions. A prestorm event that was observed in the African sector from low- to the mid-latitude regions on 01 May 2010 was absent in the South American sector. This study also showed that there was no generation or suppression of ionospheric irregularities by storm events. Therefore, knowledge about the suppression and generation of ionospheric irregularities during moderate geomagnetic storms is still unclear. (C) 2014 COSPAR. Published by Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 11/20270-7 - Studies of the traveling ionospheric disturbances of large and medium scale in the Brazilian sector during the period of ascension of the solar cycle 24.
Grantee:Alessandro José de Abreu
Support Opportunities: Scholarships in Brazil - Post-Doctoral