Magnetic Storm
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Auroral electron precipitating energy during magnetic storms with peculiar long recovery phase features / Energia de precipitação auroral de elétrons durante tempestades magnéticas com características peculiares de longa fase de recuperação
Aurora, light emissions generated by collisions between energetic electrons and atmospheric particles, is often seen in the polar region. Although much is known about the aurora, there are still many questions unanswered. For example, it is not well known what is the source of the energetic particles or by what processes the particles are energized. Understa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/11/2010
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2. Posicionamento por GPS na região brasileira durante a intensa tempestade geomagnética de 29 de outubro de 2003
The error due to the ionosphere in the GPS observables depends on the Total Electron Content (TEC) in the ionospheric layer. The TEC varies regularly in time and space in relation to the sunspot number, the season, the local time, the geographic position, and others. However, the TEC can suffer abrupt modifications in its behavior due to the occurrence of in
Publicado em: 2010
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3. 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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4. Previsão do índice geomagnético dst utilizando redes neurais artificiais e árvore de decisão / Geomagnetic DST index forecast using artificial neural networks and decision tree
A Terra sofre constante influência da atividade solar através do vento solar, que traz consigo estruturas resultantes, principalmente, de eventos solares como explosões solares e ejeções coronais de massa. A interação quase estática do vento solar com o campo geomagnético forma a estrutura denominada magnetosfera, que funciona como um escudo, que pr
Publicado em: 2009
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5. Efeitos de tempestades magnéticas em sinais de gps, em Natal, Brasil
Sinais de satélites apresentam perturbações (cintilações), devido à presença de irregularidades no plasma ionosférico. No presente trabalho, dedicamo-nos ao estudo da atenuação dessas cintilações ou seja, uma melhoria no sinal, durante a fase principal de tempestades magnéticas presentes no peróodo de outubro 2006 a fevereiro 2007. Usando-se da
Publicado em: 2008
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6. A influência dos parâmetros do vento solar na emissão de AKR durante tempestades magnéticas / The influence of the solar wind parameters on the AKR emission during magnetic storms
Several phenomena could be better studied and even disclosed after the development of the satellites and spacecrafts. Auroral Kilometric Radiation (AKR) is one of these phenomena. AKR was first detected only about thirty years ago; its typical frequencies are too low to penetrate earthward across the ionosphere. This radiation is generated through wave-parti
Publicado em: 2006
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7. Great geomagnetic storms in the rise and maximum of solar cycle 23
Geomagnetic storms are intervals of time when a sufficiently intense and long-lasting interplanetary convection electric field leads, through a substantial injection of energy into the magnetosphere-ionosphere system, to an intensified ring current, strong enough to exceed some key threshold of the quantifying storm time Dst index. We have studied all the 9
Brazilian Journal of Physics. Publicado em: 2004-12
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8. Study of magnetic storm effects on the ionosphere using GPS data / Estudo do efeito de tempestades magnéticas na ionosfera utilizando dados do GPS
Apesar do significativo progresso obtido nos estudos sobre as relações Sol-Terra durante períodos magneticamente perturbados, o entendimento dos efeitos das tempestades magnéticas na atmosfera superior neutra e ionizada ainda permanece como um dos assuntos mais desafiantes sobre a física desta região atmosférica. Para investigar os processos de acopla
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2003
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9. 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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10. Effects of intense magnetic storms on the low latitude ionosphere / Efeito das tempestades magneticas intensas na ionosfera de baixa latitude
The objective of this dissertation is to study the magnetic storm effects on the ionospheric F region over the equatorial region (Fortaleza)and the low-latitude region (Cachoeira Paulista), in Brazil. This research subject is relatively new and of interest to the international scientific community. It is a complex topic since it comprises an assortment of co
Publicado em: 2000
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11. A origem interplanetária e o desenvolvimento da fase principal das tempestades geomagnéticas moderadas (1978-1979) / The interplanetary origins and the main-phase development of moderate geomagnetic storms (1978-1979)
Geomagnetic storms are related to the ring current, which is driven by energy injection primarily during energetic solar wind-magnetosphere coupling due to reconnection at the magnetopause. This work identified the interplanetary origins of moderate geomagnetic storms (-100 nT
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/08/1992
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12. The interplanetary origins and the main-phase development of moderate geomagnetic storms (1978-1979) / A origem interplanetária e o desenvolvimento da fase principal das tempestades geomagnéticas moderadas (1978-1979)
Geomagnetic storms are related to the ring current, which is driven by energy injection primarily during energetic solar wind-magnetosphere coupling due to reconnection at the magnetopause. This work identified the interplanetary origins of moderate geomagnetic storms (-100 nT < DstMíN < -50 nT) and analysed the coupling processes during the storm mai
Publicado em: 1992