Ionospheric Electron Density
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Numerical Simulations to Assess ART and MART Performance for Ionospheric Tomography of Chapman Profiles
ABSTRACT The incomplete geometrical coverage of the Global Navigation Satellite System (GNSS) makes the ionospheric tomographic system an ill-conditioned problem for ionospheric imaging. In order to detect the principal limitations of the ill-conditioned tomographic solutions, numerical simulations of the ionosphere are under constant investigation. In this
An. Acad. Bras. Ciênc.. Publicado em: 31/07/2017
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2. Electric and magnetic field signatures of gravity waves and 2-day planetary waves in the equatorial E-region / Assinaturas nos campos elétricos e magnéticos às ondas de gravidade e ondas planetárias de 2-dias na região E equatorial
Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type 11) instabilities. From the Type II irregularity velocities obtained by radar data we have inferred the vertical electric fields (E_z). The harmonic an
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/02/2009
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3. Assinaturas nos campos elétricos e magnéticos às ondas de gravidade e ondas planetárias de 2-dias na região E equatorial / Electric and magnetic field signatures of gravity waves and 2-day planetary waves in the equatorial E-region
Equatorial electrojet (EEJ) observations using VHF radars show backscattered echoes from two types of electron density irregularities explained by the modified two-stream (Type I) and the gradient drift (Type 11) instabilities. From the Type II irregularity velocities obtained by radar data we have inferred the vertical electric fields (E_z). The harmonic an
Publicado em: 2009
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4. Morfologia e dinâmica das irregularidades ionosféricas de pequena escala e imageamento ionosférico por GPS / Morphology and dynamic of small-scale ionospheric irregularities and ionospheric imaging by GPS
The signals received from the Global Positioning System (GPS) satellites were used to study the behavior of three important geophysical parameters of the ionosphere: small-scale irregularities, their zonal drift velocities and the Total Electron Content (TEC). From the fluctuations (scintillations) in the amplitude of the GPS L1 signal (1575.42 MHz), detecte
Publicado em: 2008
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5. Estudo de irregularidades ionosféricas em períodos de baixa ocorrência em baixas latitudes sob condições calmas / Studies of low-latitude ionospheric irregularities during the periods of their low frequency of occurrence, and under quiet conditions
This thesis research focalises a study of the mechanisms involved in the generation and evolution of the ionospheric plasma bubbles by means of experimental data and modeling. The experimental data were obtained by night airglow (OI630nm) imagers and Digisondes. The airglow allsky imager was located at São João do Cariri (7,5°S, 36,5°O, I=-20°), and the
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 30/11/2005
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6. Studies of low-latitude ionospheric irregularities during the periods of their low frequency of occurrence, and under quiet conditions / Estudo de irregularidades ionosféricas em períodos de baixa ocorrência em baixas latitudes sob condições calmas
This thesis research focalises a study of the mechanisms involved in the generation and evolution of the ionospheric plasma bubbles by means of experimental data and modeling. The experimental data were obtained by night airglow (OI630nm) imagers and Digisondes. The airglow allsky imager was located at São João do Cariri (7,5°S, 36,5°O, I=-20°), and the
Publicado em: 2005
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7. Estudo das irregularidades ionosféricas equatoriais utilizando sinais GPS / Global positioning system studies of equatorial ionospheric irregularities
Signals transmitted by the Global Positioning System (GPS) satellites were used to study equatorial ionospheric irregularities over Brazil. GPS (L1=1.575 GHz) scintillation data were used to infer the occurrence of ~400m scale-size irregularities and compared with equatorial Spread F (ESF) observations carried out by several other instruments like VHF cohere
Publicado em: 2003
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8. Estudo das irregularidades ionosféricas equatoriais utilizando sinais GPS / Global positioning system studies of equatorial ionospheric irregularities
Sinais transmitidos por satélites do Sistema de Posicionamento Global (GPS) foram utilizados para estudar irregularidades ionosféricas equatoriais no Brasil. Dados de cintilação nos sinais GPS (L1=1,575 GHz) foram utilizados para estimar a ocorrência de irregularidades ionosféricas com escalas de tamanho em torno de 400 metros. Dados de cintilação ta
Publicado em: 2003
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9. Study on temporal and spatial evolution of ionospheric plasma depletions zonal drift by nightglow OI 630 NM digital images / Estudos da evolução temporal/espacial das derivas das depleções do plasma ionosférico por imagens digitais da aeroluminescência OI 630 NM noturna
O objetivo deste estudo é calcular as velocidades de derivas zonais, e os gradientes, das bolhas ionosféricas que ocorreram em Cachoeira Paulista (22,5o S, 45o O, dip 30o S)para o período de outubro de 1998 a outubro de 1999. Para isto, utilizou-se a técnica ótica da aeroluminescência OI 630 nm. O OI 630 nm é uma luz vermelha proveniente do oxigênio
Publicado em: 2000
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10. Precipitacao de partículas e efeitos ionosféricos associados na região da anomalia geomagnética brasileira / Particle precipitation and associated ionospheric effects in the Brazilian Geomagnetic Anomaly region
The purpose of the present study is to examine the significance of quiet time ionization due to charged particle precipitation in the E-region over Brazilian Geomagnetic Anomaly. Ionosonde data of the sporadic E layer obtained for São José dos Campos (23°12 S, 45°51 W) and Cachoeira Paulista (22°42 S, 45°01 W) for a few months during the period 1973-74
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/12/1975