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Artículo

Effects of X2-class solar flare events on ionospheric GPS-TEC and radio waves over Brazilian sector

de Abreu, Alessandro José; Roberto, M.; Alves, Mauro Angelo; Abalde, José Ricardo; Nogueira, Paulo A. B.; Venkatesh, Kavutarapu; Fagundes, Paulo Roberto; De Jesus, Rodolfo; Gende, Mauricio AlfredoIcon ; Martín, Inácio Malmonge
Fecha de publicación: 06/2019
Editorial: Elsevier
Revista: Advances in Space Research
ISSN: 0273-1177
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Meteorología y Ciencias Atmosféricas

Resumen

In this investigation, we present and discuss the effects of 6 X2-class solar flare events in the ionospheric F region over Brazilian sector that occurred during 2013 to 2015. For this investigation, we present the vertical total electron content (VTEC) observations from nearly 120 Global Positioning System (GPS) receivers all over the Brazilian sector for each event. Also, ionospheric sounding observations obtained in São José dos Campos (23.2°S, 45.9°W, dip latitude 17.6°S; hereafter referred to as SJC), under the southern crest of the equatorial ionospheric anomaly (EIA), Brazil, are presented. The observations show that the greatest TEC impact occurs with the EUV fluxes increases lasting for more than one hour and when the solar active region is located close to the solar disc center. We present a detailed study of the efficiency of the EUV flux with wavelengths ranging from 0.1 to 190 nm for the F region ionization. The largest increase of ΔTEC occurs below the magnetic equator line, covering mainly the central, northeast, southeast and south regions, which includes the equatorial ionospheric anomaly (EIA) region. The ionograms show partial or total fade out in the echoes traces observed causing blackouts of radio signals of up to 60 min, which can have serious consequences to technological systems of public and private agencies around Brazilian sector. This study can help to better understand the effects of solar flares in the ionospheric F region.
Palabras clave: GPS , IONOSONDE , IONOSPHERE , SOLAR FLARE
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/128091
DOI: http://dx.doi.org/10.1016/j.asr.2019.02.020
URL: https://www.sciencedirect.com/science/article/pii/S0273117719301243
Colecciones
Articulos(CCT - LA PLATA)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - LA PLATA
Citación
de Abreu, Alessandro José; Roberto, M.; Alves, Mauro Angelo; Abalde, José Ricardo; Nogueira, Paulo A. B.; et al.; Effects of X2-class solar flare events on ionospheric GPS-TEC and radio waves over Brazilian sector; Elsevier; Advances in Space Research; 63; 11; 6-2019; 3586-3605
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