Earth Magnetosphere
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Efeitos do vento solar na magnetosfera terrestre: uma abordagem didática dos cinturões de Van Allen
Resumo Neste trabalho realizamos uma abordagem didática de aspectos relacionados ao geomagnetismo e como esses aspectos podem ser influenciados pela ação do vento solar. A carência de textos didáticos que promovam explicações em termos de conceitos de física básica foi a principal motivação para esse trabalho. Iniciamos com uma discussão históri
Rev. Bras. Ensino Fís.. Publicado em: 20/01/2020
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2. Geomagnetic DST index forecast using artificial neural networks and decision tree / Previsão do índice geomagnético dst utilizando redes neurais artificiais e árvore de decisão
The Earth suffers constant influence of the solar activity through the solar wind, which brings with it the resulting structures, mainly phenomena like solar flares and coronal mass ejection. The almost static interaction between the solar wind and the geomagnetic field forms a structure called magnetosphere, which acts as a shield that protects the planet f
Publicado em: 2009
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3. Quark matter (strangelets) from astrophysical sources and its detection by terrestrial experiments. / Matéria de quarks (strangelets) de origem astrofísica e sua detecção por experimentos terrestres
The strange quark matter hypothesis, which states that a plasma composed of quarks up, down and strange in roughly equal amounts is absolutely stable at zero pressure, has been studied for more than twenty years, both theoretically and during searches for its detection in specific experiments. If strange quark matter is indeed stable, then there could be imp
Publicado em: 2008
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4. Seasonal cusp radiation belt on dayside magnetosphere
The possibility of quasi-stable trapping of charged particles of hundreds keV to MeV energy on the frontside Earth magnetosphere is explored in by numerical modeling of the single particle orbits in the geomagnetic field utilizing empirical Tsyganenko magnetic field model. Due to solar wind pressure the remote magnetic field lines on the frontside of the mag
Brazilian Journal of Physics. Publicado em: 2004-12
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5. Bidimensional hidrodinamic model of coronal mass ejections / Modelo hidrodinâmico bidimensional de ejeção de massa coronal
A twodimensional hydrodynamical model is used to follow, in time and space, coronal structures that propagate through the interplanetary medium. These estructures are known as Coronal Mass Ejections (CMEs). A twodimensional grid with the steady state solar wind solution representing the inteplanetary medium is used as the initial condition. The steady state
Publicado em: 2004
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6. Modelo hidrodinâmico bidimensional de ejeção de massa coronal / Bidimensional hidrodinamic model of coronal mass ejections
Um modelo hidrodinâmico (HD) numérico bidimensional é utilizado para investigar, em tempo e espaço, estruturas originárias na coroa solar e que se propagam pelo meio interplanetário, estruturas estas conhecidas como Ejeção de Massa Coronal (EMC). Uma grade bidimensional cartesiana contendo uma solução estacionária do vento solar representando o me
Publicado em: 2004
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7. Estudo de estruturas geoefetivas no meio interplanetário e de suas causas solares. / Study of the interplanetary geoeffective structures and their solar origins
In this work we have studied geoeffective interplanetary structures observed near earth and their solar origins, involving several basic and applied scientific aspects, related to the research area named Space Weather. We present a study of the coronal mass ejections (CME) observed at the sun by the LASCO instrument, in the period of January 1997 to April 20
Publicado em: 2003
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8. Space weather impact on magnetosphere: new helium radiation belt storm time formation
The consequences of the March 1991 storm on the Earth's radiation environment are now well known through many in-situ magnetospheric observations. Measurement from the CRRES spacecraft show the sudden formation of a new Helium ion structure deep within the magnetosphere. In that event, two additional new radiation belts were created, one containing large flu
Brazilian Journal of Physics. Publicado em: 2002-06
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9. Emissão, propagação e amplificação da radiação quilométrica das auroras nas subcavidades aurorais
The present work investigates the propagation and amplification of electromagnetic waves in a plasma localized in the vicinity of the geomagnetic poles, at heights not much greater than three times the Earth s radius. The phenomena studied is known as the Aurorai Kilometric Radiation (AKR), the strongest of the various types of emission that can occur as a c
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2001
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10. On positron radiation belt in the Earth's magnetosphere
The ratio of positron/electron fluxes originated in nuclear spallation reactions in the Earth's magnetosphere is considered. It is supposed that positrons as well as electrons are produced in the decay of charged pions (pi±® m± ->e±) born in nuclear collisions of trapped relativistic inner zone protons with the residual atmospher
Brazilian Journal of Physics. Publicado em: 2000