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Data assimilation for three-dimensional modelling of the ionosphere in Brazil

Grant number: 15/15027-7
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): December 01, 2015
Effective date (End): January 31, 2019
Field of knowledge:Physical Sciences and Mathematics - Geosciences - Geodesy
Principal researcher:Paulo de Oliveira Camargo
Grantee:Fabricio dos Santos Prol
Home Institution: Faculdade de Ciências e Tecnologia (FCT). Universidade Estadual Paulista (UNESP). Campus de Presidente Prudente. Presidente Prudente , SP, Brazil
Associated scholarship(s):16/22011-2 - Data assimilation for three-dimensional modelling of the ionosphere in Brazil, BE.EP.DR

Abstract

Spatial and temporal variation of the electron density in the atmosphere makes the ionosphere a difficult region to model. Many models were developed using the GNSS (Global Navigation Satellite System) observation to represent the ionosphere in Vertical Total Electron Content (VTEC) maps. However, errors in the VTEC modeling occur due to the consideration of the ionosphere as a thin shell with constant height. By contrast, ionosphere is a layer with 1000 km thickness. The ionospheric profile can be calculated using tomographic reconstruction techniques, which are based on TEC (Total Electron Content) observations from GNSS to map the ionosphere in three dimensions. However, performing tomographic reconstructions using only TEC measurements shows deficiencies in vertical representations of the ionosphere. To overcome this geometric deficiency, data assimilation can be performed including ionospheric profiles in the tomographic reconstruction. In addition, a relevant peculiarity of the Brazilian region is the fact that some ionospheric dynamics over the region are not completely understood and it is affected by strong vertical drifts in the evening pre-reverse period. In this way, the research project aims to study tomographic reconstruction methods of the ionosphere using data assimilation including TEC observations and ionospheric profiles. The experiments will be conducted with GNSS data from global and regional networks, as well as using ionosondes installed around the world and in Brazil. Furthermore, Radio-Occultation techniques will be included in the tomographic reconstruction. The results will be validated using the Root Mean Square Error (RMSE) of the critical frequency and peak elevation of the F2 layer of the ionosphere (foF2 and hmF2). Also, we will calculate the RMSE of the slant TEC (STEC) and STEC will be applied in GNSS positioning to evaluate the improvement in Precise Point Positioning (PPP). Finally, possible representations of the ionosphere in the Brazilian region will be assessed from TEC assimilation with the ionospheric profiles.

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
PROL, FABRICIO DOS SANTOS; CAMARGO, PAULO DE OLIVEIRA; DE ASSIS HONORATO MUELLA, MARCIO TADEU. COMPARATIVE STUDY OF METHODS FOR CALCULATING IONOSPHERIC POINTS AND DESCRIBING THE GNSS SIGNAL PATH. Bol. Ciênc. Geod., v. 23, n. 4, p. 669-683, . (15/15027-7)
PROL, FABRICIO DOS SANTOS; HERNANDEZ-PAJARES, MANUEL; CAMARGO, PAULO DE OLIVEIRA; DE ASSIS HONORATO MUELLA, MARCIO TADEU. Spatial and Temporal Features of the Topside Ionospheric Electron Density by a New Model Based On GPS Radio Occultation Data. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, v. 123, n. 3, p. 2104-2115, . (16/22011-2, 15/15027-7)
PROL, FABRICIO DOS SANTOS; HERNANDEZ-PAJARES, MANUEL; DE ASSIS HONORATO MUELLA, MARCIO TADEU; CAMARGO, PAULO DE OLIVEIRA. Tomographic Imaging of Ionospheric Plasma Bubbles Based on GNSS and Radio Occultation Measurements. REMOTE SENSING, v. 10, n. 10, . (16/22011-2, 15/15027-7)
PROL, FABRICIO DOS SANTOS; CAMARGO, PAULO DE OLIVEIRA; GALERA MONICO, JOAO FRANCISCO; DE ASSIS HONORATO MUELLA, MARCIO TADEU. Assessment of a TEC calibration procedure by single-frequency PPP. GPS SOLUTIONS, v. 22, n. 2, . (15/15027-7)
PROL, FABRICIO DOS SANTOS; THEMENS, DAVID R.; HERNANDEZ-PAJARES, MANUEL; CAMARGO, PAULO DE OLIVEIRA; DE ASSIS HONORATO MUELLA, MARCIO TADEU. Linear Vary-Chap Topside Electron Density Model with Topside Sounder and Radio-Occultation Data. SURVEYS IN GEOPHYSICS, v. 40, n. 2, p. 277-293, . (16/22011-2, 15/15027-7)
PROL, FABRICIO DOS SANTOS; CAMARGO, PAULO DE OLIVEIRA; HERNANDEZ-PAJARES, MANUEL; DE ASSIS HONORATO MUELLA, MARCIO TADEU. A New Method for Ionospheric Tomography and Its Assessment by Ionosonde Electron Density, GPS TEC, and Single-Frequency PPP. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, v. 57, n. 5, p. 2571-2582, . (15/15027-7, 16/22011-2)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
PROL, Fabricio dos Santos. IonMAP: Data assimilation system for three-dimensional imaging of the ionosphere in Brazil. 2019. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Ciências e Tecnologia. Presidente Prudente Presidente Prudente.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.