Tomographic imaging of the equatorial and low-latitude ionosphere over central-eastern Brazil

• Published in: Earth, planets, and space Vol. 63; no. 2; pp. 129 - 138
• Main Authors: Muella, Marcio T. A. H., de Paula, Eurico R., Mitchell, Cathryn N., Kintner, Paul M., Paes, Ricardo R., Batista, Inez S.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-01-2011; Terra; Springer Nature B.V
• Subjects: Cosmochemistry. Extraterrestrial geology; Earth and Environmental Science; Earth Sciences; Earth, ocean, space; Exact sciences and technology; Geology; Geophysics/Geodesy; South America; Brazil; Southern Europe; Italy; Marches Italy; Europe; IRI model; ionospheric imaging; equatorial ionization anomaly; TEC; Ionospheric tomography; GPS; digital ionosonde; algorithms; accuracy; ionosphere; networks; frequency; instruments; tomography; Low latitude; Maximum solar activity; models; Data analysis; Total electron content; Density distribution; monitoring; anomalies; Global Positioning System; correlation; Ionization; electron density
• ISSN: 1343-8832; 1880-5981
• DOI: 10.5047/eps.2010.12.011

A four-dimensional time-dependent tomographic algorithm, named Multi Instrument Data Analysis System (MIDAS), is used to image the equatorial and low-latitude ionosphere over the central-eastern sides of the Brazilian territory. From differential phase data obtained by a chain of ground-based GPS receiver the total electron content (TEC) is estimated and then, together with a modeled ionosphere from International Reference Ionosphere (IRI) model, the electron density distribution is reconstructed and the parameters of the
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2
-peak layer are accessed from the images. This paper presents the first study of ionospheric tomography using real dual-frequency data from the Brazilian Network for Continuous GPS Monitoring (RBMC). Ionospheric
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-peak electron density (
N
m
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) accessed from the images are compared to concurrent measurements from three ionosondes installed across Brazil. One year of data during the solar maximum period from March/2001 to February/2002 is used to analyze the seasonal and hourly variation of the
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-layer peak density. The accuracy with which MIDAS images the electron density during geomagnetic quiet periods is investigated through its correlation and deviation with the ionosonde and IRI model data, respectively. The main aspects of the reconstruction results at the equatorial ionization anomaly (EIA) region over Brazil are highlighted and discussed.