| Texto completo | |
| Autor(es): |
de Oliveira, Cesar Buchile Abud
[1]
;
Espejo, Teddy Modesto Surco
[2]
;
Moraes, Alison
[3]
;
Costa, Emanoel
[2]
;
Sousasantos, Jonas
[1]
;
Lourenco, Luis Felipe Dias
[4]
;
Abdu, Mangalathayil Ali
[5]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] ITA, Praca Marechal Eduardo Gomes 50, BR-12228900 Sao Jose Dos Campos, SP - Brazil
[2] Pontificia Univ Catolica Rio de Janeiro PUC Rio, Ctr Estudos Telecomunicacoes CETUC, Rua Marques Sao Vicente 225, BR-22451900 Rio De Janeiro, RJ - Brazil
[3] IAE, Praca Marechal Eduardo Gomes 50, BR-12228904 Sao Jose Dos Campos, SP - Brazil
[4] EMBRAER, Rod Presidente Dutra, KM 134, BR-12247004 Sao Jose Dos Campos, SP - Brazil
[5] INPE, Ave Astronautas 1-758, BR-1222701 Sao Jose Dos Campos, SP - Brazil
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo de Revisão |
| Fonte: | SURVEYS IN GEOPHYSICS; v. 41, n. 4 MAR 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
The ionosphere over the Brazilian region has particular characteristics due to the large geomagnetic declination angle over most of the territory. Furthermore, the equatorial ionization anomaly southern crest is located over the Brazilian territory. In this region, plasma irregularities may arise in the post-sunset hours. These ionospheric irregularities develop in the form of magnetic field-aligned plasma depletions, known as equatorial plasma bubbles, which may seriously affect radio signals that propagate through them. These irregularity structures can cause amplitude and phase scintillation of the propagating signals, thereby compromising the availability, performance, and integrity of satellite-based communication and navigation systems. Additionally, the total electron content (TEC) introduces propagation delays that can contribute to range measurement errors for global positioning system (GPS) users. The ionospheric characteristics change significantly according to the time of day, season, as well as the solar and geomagnetic activities, among other factors. Indeed, the ionosphere is one of the most significant sources of errors in the positioning and navigation systems based on the GPS satellites. Due to these features, there is a strong interest by the scientific community in better understanding and characterizing the ionospheric behavior. In this context, the TEC analysis has wide applicability for space plasma studies and is a well-established tool for investigating the ionospheric behavior and its potential impact on space-based navigation systems. One of the goals of these studies is the generation of TEC maps for a geographic region based on GPS observations. In the present work, some electrodynamic processes of the low-latitude ionosphere are reviewed and the TEC estimation based on GPS measurements is revisited in detail. A methodology aimed at creating the TEC maps is presented and validated by comparison with results from other geophysical instruments, such as all-sky imagers and ionosondes. Finally, examples of the ionospheric behavior displayed by TEC maps during equatorial plasma bubble events and a geomagnetic storm are fully described and discussed. (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: | 06/04008-2 - GNSS: investigações e aplicações no posicionamento geodésico, em estudos relacionados com a atmosfera e na agricultura de precisão |
| Beneficiário: | Joao Francisco Galera Monico |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 18/06158-9 - Estudos estatísticos da variação dos parâmetros ionosféricos e sua relação com eventos do clima espacial |
| Beneficiário: | Jonas de Sousa dos Santos |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |