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de Paula, Eurico R. ; Martinon, Andre R. F. ; Carrano, Charles ; Moraes, Alison O. ; Neri, Jose A. C. F. ; Cecatto, Jose R. ; Abdu, Mangalathayil A. ; Neto, Acacio C. ; Monico, Joao F. G. ; Silva, Weverton da Costa ; Vani, Bruno C. ; Batista, Inez S. ; Mendes, Odim ; de Souza, Jonas R. ; Silva, Andre L. A.

• Tipo de documento: Artigo Científico
• Fonte: RADIO SCIENCE; v. 57, n. 10, p. 15-pg., 2022-10-01.

Resumo

Strong solar flare events can occur even during the decay phase of the solar cycle. During these events concurrent increases in the X-ray and Enhanced UV (EUV) fluxes and solar radio bursts (SRBs) can be observed. The SRBs cover a large range of frequencies including the L band, giving rise to signal fades in the GNSS carrier-to-noise ratio and fluctuations in its amplitude and phase. The increases in the X-ray, UV, and EUV fluxes cause increase in the ionospheric D, E, and F region electron densities. The aim of this work is to analyze the effects in the GNSS signal, in the ionosphere and in the magnetic field H component of the X9.3 and X1.3 solar flares that occurred on 06 and 07 September 2017, respectively. Data from a network of six GNSS receivers, two magnetometers, and four Digisondes are used in the analysis. Fades of about 5 and 10 dB were observed in the signals of GNSS L1 and L2/L5 frequencies, respectively. Significant positioning errors, were observed for the strongest X9.3 flare. A sudden increase in Total Electron Content with the rates of 2.5-5.0 TECU/min was observed. An increase in the E layer density gave origin to an increase in the Equatorial Electrojet intensity, whose signatures were observed in the H component of two magnetometers. Another observed effect was the ionospheric D region density increase that caused disruption in the Digisonde signal. As a consequence of the described effects, GNSS receivers may fail to produce accurate navigation solution. (AU)

• Processo FAPESP: 17/50115-0 - INCT 2014: tecnologia GNSS no suporte à navegação aérea
• Beneficiário: Joao Francisco Galera Monico
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisa em Políticas Públicas
• Processo FAPESP: 18/23754-4 - Tecnologia GNSS no suporte à navegação aérea
• Beneficiário: André Ricardo Fazanaro Martinon
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico