| Full text | |
| Author(s): Show less - |
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.
Total Authors: 15
|
| Document type: | Journal article |
| Source: | RADIO SCIENCE; v. 57, n. 10, p. 15-pg., 2022-10-01. |
| Abstract | |
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) | |
| FAPESP's process: | 17/50115-0 - GNSS technology for supporting air navigation |
| Grantee: | Joao Francisco Galera Monico |
| Support Opportunities: | Research Grants - Research in Public Policies |
| FAPESP's process: | 18/23754-4 - GNSS technology in support of air navigation |
| Grantee: | André Ricardo Fazanaro Martinon |
| Support Opportunities: | Scholarships in Brazil - Technical Training Program - Technical Training |